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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549



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FORM 10-Q



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|x | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ---------------------------------------------------------------------------------------

For the quarterly period ended June 30, 2006

Or



| ̈ | TRANSITION REPORT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | -------------------------------------------------------------------------------

For the transition period from  to

Commission File No. 333-113340



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MEWBOURNE ENERGY PARTNERS 04-A, L.P.



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|                                                         |  |                                        
|-------------------------------------------------------- |  | ---------------------------------------
|Delaware                                                 |  | 20-0718858                             
|(State or jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification Number)
|                                                         | 
|3901 South Broadway, Tyler, Texas                        |  | 75701                                  
|(Address of principal executive offices)                 |  | (Zip code)                             

Registrants Telephone Number, including area code: (903) 561-2900

Not Applicable

(Former name, former
address and former fiscal year, if changed since last report)



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Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 of 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter
period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No ̈

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer or a non-accelerated filer. See definition of accelerated filer and large accelerated filer in Rule 12b-2 of
the Exchange Act. (Check one):



|                         |  |                    |  |                         
|------------------------ |  | ------------------ |  | ------------------------
|Large accelerated filer ̈ |  | Accelerated filer ̈ |  | Non-accelerated filer  x

Indicate by check mark if the registrant is a shell company (as defined in Rule 12b-2 of the Exchange
Act).    Yes ̈No  x



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Mewbourne Energy Partners 04-A, L.P.

INDEX



|                               |  |                                                                                                                                         |  |         
|------------------------------ |  | --------------------------------------------------------------------------------------------------------------------------------------- |  | --------
|                               |  |                                                                                                                                         |  | Page No.
|Part I  Financial Information |  |                                                                                                                                        
|                               |  |                                                                                                                                        
|Item 1.                        |  | Financial Statements                                                                                                                    |  |         
|                               |  |                                                                                                                                        
|                               |  | Balance Sheets -June 30, 2006 (Unaudited) and December 31, 2005                                                                         |  | 3       
|                               |  |                                                                                                                                        
|                               |  | Statements of Operations (Unaudited) -For the three months ended June 30, 2006 and 2005 and the six months ended June 30, 2006 and 2005 |  | 4       
|                               |  |                                                                                                                                        
|                               |  | Statements of Cash Flows (Unaudited) -For the six months ended June 30, 2006 and 2005                                                   |  | 5       
|                               |  |                                                                                                                                        
|                               |  | Statement of Changes In Partners Capital (Unaudited) -For the six months ended June 30, 2006                                           |  | 6       
|                               |  |                                                                                                                                        
|                               |  | Notes to Financial Statements                                                                                                           |  | 7       
|                               |  |                                                                                                                                        
|Item 2.                        |  | Managements Discussion and Analysis of Financial Condition and Results of Operations                                                   |  | 10      
|                               |  |                                                                                                                                        
|Item 3.                        |  | Quantitative and Qualitative Disclosures about Market Risk                                                                              |  | 13      
|                               |  |                                                                                                                                        
|Item 4.                        |  | Disclosure Controls and Procedures                                                                                                      |  | 13      
|                               | 
|Part II  Other Information    |  |                                                                                                                                        
|                               |  |                                                                                                                                        
|Item 1.                        |  | Legal Proceedings                                                                                                                       |  | 13      
|                               |  |                                                                                                                                        
|Item 6.                        |  | Exhibits and Reports on Form 8-K                                                                                                        |  | 14      



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##### Table of Contents

Mewbourne Energy Partners 04-A, L.P.

Part I  Financial Information

Item 1. Financial Statements

BALANCE SHEETS

June 30, 2006 and December 31, 2005



|                                                                      |  |               |            |   |                  |   |            |  
|--------------------------------------------------------------------- |  | ------------- | ---------- | - | ---------------- | - | ---------- | -
|                                                                      |  | June 30, 2006 |            |   | December 31,2005 |  
|                                                                      |  | (Unaudited)   |            |   |                  |  
|ASSETS                                                                |  |               |            |   |                  |   |            |  
|Cash and cash equivalents                                             |  | $             | 44,495     |   |                  | $ | 333,699    |  
|Accounts receivable, affiliate                                        |  |               | 1,431,132  |   |                  |   | 4,152,601  |  
|Accounts receivable, other                                            |  |               | 157        |   |                  |   | 1,841      |  
|                                                                      |  |               |            |   |                  |   |            |  
|Total current assets                                                  |  |               | 1,475,784  |   |                  |   | 4,488,141  |  
|                                                                      |  |               |            |   |                  |   |            |  
|Oil and gas properties at cost, full cost method                      |  |               | 29,079,216 |   |                  |   | 28,712,759 |  
|Less accumulated depreciation, depletion, amortization and impairment |  |               | (9,615,117 | ) |                  |   | (5,736,266 | )
|                                                                      |  |               |            |   |                  |   |            |  
|                                                                      |  |               | 19,464,099 |   |                  |   | 22,976,493 |  
|                                                                      |  |               |            |   |                  |   |            |  
|Total assets                                                          |  | $             | 20,939,883 |   |                  | $ | 27,464,634 |  
|                                                                      |  |               |            |   |                  |   |            |  
|LIABILITIES AND PARTNERS CAPITAL                                     |  |               |            |   |                  |   |            |  
|Accounts payable, affiliate                                           |  | $             | 459,394    |   |                  | $ | 372,462    |  
|                                                                      |  |               |            |   |                  |   |            |  
|Asset retirement obligation plugging liability                        |  |               | 384,350    |   |                  |   | 377,536    |  
|                                                                      |  |               |            |   |                  |   |            |  
|Partners capital                                                     |  |               |            |   |                  |   |            |  
|General partners                                                      |  |               |           |   |                  |   | 24,252,438 |  
|Limited partners                                                      |  |               | 20,096,139 |   |                  |   | 2,462,198  |  
|                                                                      |  |               |            |   |                  |   |            |  
|Total partners capital                                               |  |               | 20,096,139 |   |                  |   | 26,714,636 |  
|                                                                      |  |               |            |   |                  |   |            |  
|Total liabilities and partners capital                               |  | $             | 20,939,883 |   |                  | $ | 27,464,634 |  
|                                                                      |  |               |            |   |                  |   |            |  

The accompanying notes are an integral part of the financial statements.



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Mewbourne Energy Partners 04-A, L.P.

STATEMENTS OF OPERATIONS

For the three months ended June 30, 2006 and 2005 and

the six months ended June 30, 2006 and 2005

(Unaudited)



|                                                                                |  |                             |            |                           |      |   |           |  |      |           |  |   |          
|------------------------------------------------------------------------------- |  | --------------------------- | ---------- | ------------------------- | ---- | - | --------- |  | ---- | --------- |  | - | ---------
|                                                                                |  | Three Months Ended June 30, |            | Six Months Ended June 30,
|                                                                                |  | 2006                        |            |                           | 2005 |   | 2006      |  | 2005
|Revenues and other income:                                                      |  |                             |            |                           |      |   |           |  |      |           |  |   |          
|                                                                                |  |                             |            |                          
|Oil and gas sales                                                               |  | $                           | 2,128,363  |                           |      | $ | 4,178,088 |  | $    | 5,814,161 |  | $ | 6,419,095
|Interest income                                                                 |  |                             | 2,566      |                           |      |   | 40,978    |  |      | 9,022     |  |   | 87,250   
|                                                                                |  |                             |            |                           |      |   |           |  |      |           |  |   |          
|Total revenues and other income                                                 |  |                             | 2,130,929  |                           |      |   | 4,219,066 |  |      | 5,823,183 |  |   | 6,506,345
|                                                                                |  |                             |            |                           |      |   |           |  |      |           |  |   |          
|Expenses:                                                                       |  |                             |            |                           |      |   |           |  |      |           |  |   |          
|                                                                                |  |                             |            |                          
|Lease operating expense                                                         |  |                             | 121,029    |                           |      |   | 96,260    |  |      | 227,168   |  |   | 164,289  
|Production taxes                                                                |  |                             | 167,599    |                           |      |   | 360,589   |  |      | 468,849   |  |   | 540,165  
|Administrative and general expense                                              |  |                             | 135,904    |                           |      |   | 139,618   |  |      | 392,087   |  |   | 220,297  
|Depreciation, depletion, and amortization                                       |  |                             | 831,226    |                           |      |   | 1,576,341 |  |      | 1,953,239 |  |   | 2,368,250
|Cost ceiling write-down                                                         |  |                             | 1,925,612  |                           |      |   |          |  |      | 1,925,612 |  |   |         
|Asset retirement obligation accretion                                           |  |                             | 3,408      |                           |      |   | 3,054     |  |      | 6,814     |  |   | 8,489    
|                                                                                |  |                             |            |                           |      |   |           |  |      |           |  |   |          
|Net income (loss):                                                              |  | $                           | (1,053,849 | )                         |      | $ | 2,043,204 |  | $    | 849,414   |  | $ | 3,204,855
|                                                                                |  |                             |            |                           |      |   |           |  |      |           |  |   |          
|Allocation of net income (loss)                                                 |  |                             |            |                           |      |   |           |  |      |           |  |   |          
|General partners                                                                |  | $                           |           |                           |      | $ | 1,854,889 |  | $    |          |  | $ | 2,909,474
|                                                                                |  |                             |            |                           |      |   |           |  |      |           |  |   |          
|Limited partners                                                                |  | $                           | (1,053,849 | )                         |      | $ | 188,315   |  | $    | 849,414   |  | $ | 295,381  
|                                                                                |  |                             |            |                           |      |   |           |  |      |           |  |   |          
|Basic and diluted net income (loss) per interest (30,000 interests outstanding) |  | $                           | (35.13     | )                         |      | $ | 68.11     |  | $    | 28.31     |  | $ | 106.83   
|                                                                                |  |                             |            |                           |      |   |           |  |      |           |  |   |          

The accompanying notes are an integral part of the financial statements.



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Mewbourne Energy Partners 04-A, L.P.

STATEMENTS OF CASH FLOWS

For the six months ended June 30, 2006 and 2005

(Unaudited)



|                                                                                 |  |      |            |   |      |   |            |  
|-------------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- | -
|                                                                                 |  | 2006 |            |   | 2005 |  
|Cash flows from operating activities:                                            |  |      |            |   |      |   |            |  
|Net income                                                                       |  | $    | 849,414    |   |      | $ | 3,204,855  |  
|Adjustment to reconcile net income to net cash provided by operating activities: |  |      |            |   |      |   |            |  
|Depreciation, depletion, and amortization                                        |  |      | 1,953,239  |   |      |   | 2,368,250  |  
|Cost ceiling write-down                                                          |  |      | 1,925,612  |   |      |   |            |  
|Asset retirement obligation accretion                                            |  |      | 6,814      |   |      |   | 8,489      |  
|Changes in operating assets and liabilities:                                     |  |      |            |   |      |   |            |  
|Accounts receivable, affiliate                                                   |  |      | 2,721,469  |   |      |   | (2,106,074 | )
|Accounts receivable, other                                                       |  |      | 1,684      |   |      |   |           |  
|Accounts payable, affiliate                                                      |  |      | 86,932     |   |      |   | 386,647    |  
|                                                                                 |  |      |            |   |      |   |            |  
|Net cash provided by operating activities                                        |  |      | 7,545,164  |   |      |   | 3,862,167  |  
|                                                                                 |  |      |            |   |      |   |            |  
|Cash flows from investing activities:                                            |  |      |            |   |      |   |            |  
|Purchase and development of oil and gas properties                               |  |      | (366,457   | ) |      |   | (9,673,529 | )
|                                                                                 |  |      |            |   |      |   |            |  
|Net cash used in investing activities                                            |  |      | (366,457   | ) |      |   | (9,673,529 | )
|                                                                                 |  |      |            |   |      |   |            |  
|Cash flows from financing activities:                                            |  |      |            |   |      |   |            |  
|Cash distributions to partners                                                   |  |      | (7,467,911 | ) |      |   | (2,987,912 | )
|                                                                                 |  |      |            |   |      |   |            |  
|Net cash used in financing activities                                            |  |      | (7,467,911 | ) |      |   | (2,987,912 | )
|                                                                                 |  |      |            |   |      |   |            |  
|Net (decrease) increase in cash and cash equivalents                             |  |      | (289,204   | ) |      |   | (8,799,274 |  
|Cash and cash equivalents, beginning of period                                   |  |      | 333,699    |   |      |   | 10,630,997 |  
|                                                                                 |  |      |            |   |      |   |            |  
|Cash and cash equivalents, end of period                                         |  | $    | 44,495     |   |      | $ | 1,831,723  |  
|                                                                                 |  |      |            |   |      |   |            |  

The accompanying notes are an integral part of the financial statements.



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Mewbourne Energy Partners 04-A, L.P.

STATEMENT OF CHANGES IN PARTNERS CAPITAL

For the six months ended June 30, 2006

(Unaudited)



|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|-------------------------------------------------------------------- |  | --------------- | ----------- | - | --------------- | - | ---------- | ----- |  | - | ---------- | -
|                                                                     |  | GeneralPartners |             |   | LimitedPartners |   |            | Total | 
|Balance at December 31, 2005                                         |  | $               | 24,252,438  |   |                 | $ | 2,462,198  |       |  | $ | 26,714,636 |  
|Conversion of general partner interests to limited partner interests |  |                 | (24,252,438 | ) |                 |   | 24,252,438 |       |  |   |           |  
|Cash distributions                                                   |  |                 |            |   |                 |   | (7,467,911 | )     |  |   | (7,467,911 | )
|Net income                                                           |  |                 |            |   |                 |   | 849,414    |       |  |   | 849,414    |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|Balance at June 30, 2006                                             |  | $               |            |   |                 | $ | 20,096,139 |       |  | $ | 20,096,139 |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  

The accompanying notes are an integral part of the financial statements.



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Mewbourne Energy Partners 04-A, L.P.

NOTES TO FINANCIAL STATEMENTS

(Unaudited)

1. Accounting Policies

Reference is hereby made to the Registrants Annual Report on Form 10-K for 2005, which contains a summary of significant accounting policies followed by the
partnership in the preparation of its financial statements. These policies are also followed in preparing the quarterly report included herein.

In the
opinion of management, the accompanying unaudited financial statements contain all adjustments of a normal recurring nature necessary to present fairly our financial position, results of operations, cash flows and partners capital for the
periods presented. The results of operations for the interim periods are not necessarily indicative of the final results expected for the full year.

2.
Accounting for Oil and Gas Producing Activities

Mewbourne Energy Partners 04-A, L.P., (the Registrant or the Partnership), a
Delaware limited partnership is engaged primarily in oil and gas development and production in Texas, Oklahoma, and New Mexico, and was organized on January 27, 2004. The offering of limited and general partnership interests began June 10,
2004 as a part of an offering registered under the name Mewbourne Energy Partners 04-05 Drilling Programs and concluded August 20, 2004, with total investor contributions of $30,000,000 originally being sold to 1,118 subscribers of which
$27,235,000 were sold to 1,022 subscribers as general partner interests and $2,765,000 were sold to 96 subscribers as limited partner interests. During the quarter ended June 30, 2006, all general partner interests were converted to limited
partner interests and accordingly all partnership interests have been reflected in the accompanying financial statements as limited partner interests.

The
Partnership follows the full-cost method of accounting for its oil and gas activities. Under the full-cost method, all productive and non-productive costs incurred in the acquisition, exploration and development of oil and gas properties are
capitalized. Depreciation, depletion and amortization of oil and gas properties subject to amortization is computed on the units-of-production method based on the proved reserves underlying the oil and gas properties. At June 30, 2006, all
capitalized costs were subject to amortization, while at June 30, 2005, approximately $2.6 million of capitalized costs were excluded from amortization. Proceeds from the sale or other disposition of properties are credited to the full cost
pool. Gains and losses on the sale or other disposition of properties are not recognized unless such adjustments would significantly alter the relationship between capitalized costs and the proved oil and gas reserves. Capitalized costs are subject
to a quarterly ceiling test that limits such costs to the aggregate of the present value of future net cash flows of proved reserves and the lower of cost or fair value of unproved properties. There was a cost ceiling write-down of $1,925,612 for
the six month period ended June 30, 2006. The cost ceiling write-down was caused by lower gas prices at June 30, 2006.



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3. Asset Retirement Obligations

In accordance with Financial Accounting Standards Board Statement No. 143, Accounting for Asset Retirement Obligations, the Partnership has recognized an estimated liability for future plugging and abandonment costs. The
estimated liability is based on historical experience and estimated well life. The liability is discounted using the credit-adjusted risk-free rate. Revisions to the liability could occur due to changes in well plugging and abandonment costs or well
useful lives, or if federal or state regulators enact new well restoration requirements. The Partnership recognizes accretion expense in connection with the discounted liability over the remaining life of the well.

A reconciliation of the Partnerships liability for well plugging and abandonment costs for the three months ended June 30, 2006, is as follows:



|                             |  |   |        
|---------------------------- |  | - | -------
|Balance, beginning of period |  | $ | 377,536
|Accretion expense            |  |   | 6,814  
|                             |  |   |        
|Balance, end of period       |  | $ | 384,350
|                             |  |   |        

4. Related Party Transactions

Mewbourne Development Corporation (MD) is managing general partner and Mewbourne Oil Company (MOC) is operator of oil and gas properties owned by the Partnership. Mewbourne Holdings, Inc. is the parent of both MD and
MOC. Substantially all transactions are with MD and MOC.

In the ordinary course of business, MOC will incur certain costs that will be passed on to well
owners of the well for which the costs were incurred. The Partnership will receive their portion of these costs based upon their ownership in each well incurring the costs. These costs are referred to as operator charges and are standard and
customary in the oil and gas industry. Operator charges include recovery of gas marketing costs, fixed rate overhead, supervision, pumping, and equipment furnished by the operator. Services and operator charges are billed in accordance with the
program and partnership agreements.

In consideration for services rendered by MD in managing the business of the Partnership, the Partnership during each
of the initial three years of the Partnership will pay to MD a management fee in the amount equal to 7/10s of 1% of the subscriptions by the investor partners to the Partnership. Effective 01/01/2006 the Partnership has elected to include the
management fee as part of the full cost pool pursuant to Rule 4-10(c)(6)(iii) and (iv) of Regulation S-X. The Partnership analyzed prior periods and determined that this change would not have been material in prior statements.

In general, during any particular calendar year the total amount of administrative expenses allocated to the Partnership by MOC shall not exceed the greater of
(a) 3.5% of the Partnerships gross revenue from the sale of oil and natural gas production during each year (calculated without any deduction for operating costs or other costs and expenses) or (b) the sum of $50,000 plus .25% of the
capital contributions of limited and general partners.



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The Partnership participates in oil and gas activities through a Drilling Program Agreement (the Program).
The Partnership and MD are parties to the Program. The costs and revenues of the Program are allocated to MD and the Partnership as follows:



|                                                                                                       |  |             |   |  |     |  
|------------------------------------------------------------------------------------------------------ |  | ----------- | - |  | --- | -
|                                                                                                       |  | Partnership |   |  | MD  |  
|Revenues:                                                                                              |  |             |   |  |     |  
|Proceeds from disposition of depreciable and depletable properties                                     |  | 70          | % |  | 30  | %
|All other revenues                                                                                     |  | 70          | % |  | 30  | %
|Costs and expenses:                                                                                    |  |             |   |  |     |  
|Sales commissions and due diligence fees (1)                                                           |  | 100         | % |  | 0   | %
|Organization and offering costs (2)                                                                    |  | 0           | % |  | 100 | %
|Lease acquisition costs (2)                                                                            |  | 0           | % |  | 100 | %
|Tangible and intangible drilling costs (2)                                                             |  | 100         | % |  | 0   | %
|Operating costs, reporting and legal expenses, general and administrative expenses and all other costs |  | 70          | % |  | 30  | %

---

|(1) | The Partnership will pay sales commissions and due diligence fees of 8% and 0.5%, respectively, of the capital contributions initially made by investor partners in exchange for
their respective interests.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | As noted above, pursuant to the Program, MD must contribute 100% of organization and offering costs and lease acquisition costs which approximate 20% of total capital costs. To the
extent that organization and offering costs and lease acquisition costs are less than 20% of total capital costs, MD is responsible for tangible drilling costs until its share of the Programs total capital costs reaches approximately 20%.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The Partnerships financial statements reflect its respective proportionate interest in the Program.



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Item 2. Managements Discussion and Analysis of Financial Condition and Results of Operations

Liquidity and Capital
Resources

Mewbourne Energy Partners 04-A, L.P. was formed January 27, 2004. The offering of limited and general partnership interests began
June 10, 2004 and concluded August 20, 2004, with total investor contributions of $30,000,000. During the quarter ended June 30, 2006, all general partner interests were converted to limited partner interests and accordingly all
partnership interests have been reflected in the accompanying financial statements as limited partner interests.

The Partnership has acquired interests in
oil and gas prospects for the purpose of development drilling. The Partnership participated in the drilling of 78 wells. 73 wells were productive and 5 wells were abandoned.

Future capital requirements and operations will be conducted with available funds generated from oil and gas activities. No bank borrowing is anticipated. The Partnership had net working capital of $1,016,390 at
June 30, 2006.

During the six months ended June 30, 2006, the Partnership made cash distributions to the investor partners in the amount of
$7,467,911 as compared to $2,987,912 for the six months ended June 30, 2005. The Partnership expects that cash distributions will continue during 2006 as additional oil and gas revenues are sufficient to produce cash flows from operations.

The sale of crude oil and natural gas produced by the Partnership will be affected by a number of factors that are beyond the Partnerships control.
These factors include the price of crude oil and natural gas, the fluctuating supply of and demand for these products, competitive fuels, refining, transportation, extensive federal and state regulations governing the production and sale of crude
oil and natural gas, and other competitive conditions. It is impossible to predict with any certainty the future effect of these factors on the Partnership.



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##### Table of Contents

Results of Operations

Three months ended June 30, 2006 as compared to the three months ended June 30, 2005.

Oil and gas
revenues.



|                  |  |                             |           |      |   |          
|----------------- |  | --------------------------- | --------- | ---- | - | ---------
|                  |  | Three Months Ended June 30,
|                  |  | 2006                        |           | 2005
|Oil and gas sales |  | $                           | 2,128,363 |      | $ | 4,178,088
|Barrels produced  |  |                             | 2,534     |      |   | 4,820    
|Mcf produced      |  |                             | 348,358   |      |   | 631,234  
|Average price/bbl |  | $                           | 67.55     |      | $ | 49.94    
|Average price/mcf |  | $                           | 5.62      |      | $ | 6.24     

As shown in the table above, total oil and gas sales decreased $2,049,725 (49.1%) for the three months ended
June 30, 2006 as compared to the three months ended June 30, 2005. Of this decrease, $154,401, $1,590,366 and $389,856, respectively, were related to decreases in volumes of oil sold, volumes of gas sold and decreases in the average prices
of gas sold. Volumes of oil and gas sold decreased 2,286 bbls of oil and 282,876 mcf of gas for the three months ended June 30, 2006 as compared to the three months ended June 30, 2005. The decrease in volumes of oil sold was primarily due
to a substantial decline in the production of three wells. The decrease in volumes of gas sold was primarily due to (i) normal declines in production and (ii) a substantial decline in the production of three wells. The wells with a
substantial decline in production are not expected to return to previous levels of production. Average gas prices decreased to $5.62 per mcf for the three months ended June 30, 2006 from $6.24 per mcf for the three months ended June 30,
2005. These decreases were partially offset by an increase of $84,898 related to an increase in the average price of oil sold. Average oil prices increased to $67.55 per bbl for the three months ended June 30, 2006 from $49.94 per bbl for the
three months ended June 30, 2005.

Interest income. Interest income was $2,566 during the three months ended June 30, 2006 as compared to $40,978
during the three month period ended June 30, 2005. The decrease is primarily due to the decrease in funds available for investment.

Lease operations
and production taxes. Lease operating expense during the period ended June 30, 2006 totaled $121,029 as compared to $96,260 for the period ended June 30, 2005. Production taxes during the period ended June 30, 2006 totaled $167,599 as
compared to $360,589 for the period ended June 30, 2005. Lease operating expense increased primarily due to the addition of 16 new wells from the period June 30, 2005 through June 30, 2006. The decrease in production taxes is due to
the decrease in oil and gas revenues.

Depreciation, depletion and amortization. Depreciation, depletion and amortization for the three month period ended
June 30, 2006 total $831,226 compared to $1,576,341 for the three month period ended June 30, 2005. The decrease is due to the decrease in production volumes.

Cost ceiling write-down. There was a cost ceiling write-down of $1,925,612 for the three month period ended June 30, 2006. The cost ceiling write-down was caused by lower gas prices at June 30, 2006. There
was no cost ceiling write-down for the three month period ended June 30, 2005

Administrative and general expense. Administrative and general expense
for the three month period ended June 30, 2006 total $135,904 compared to $139,618 for the period ended June 30, 2005. The decrease is due to decreased administrative charges caused by decreased oil and gas revenues. The overall decrease
was reduced by management fee of $52,500 included in the full cost pool for the period ended June 30, 2006.



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Six months ended June 30, 2006 as compared to the six months ended June 30, 2005.

Oil and gas revenues.



|                  |  |                           |           |      |   |          
|----------------- |  | ------------------------- | --------- | ---- | - | ---------
|                  |  | Six months Ended June 30,
|                  |  | 2006                      |           | 2005
|Oil and gas sales |  | $                         | 5,814,161 |      | $ | 6,419,095
|Barrels produced  |  |                           | 5,599     |      |   | 6,888    
|Mcf produced      |  |                           | 835,125   |      |   | 1,001,829
|Average price/bbl |  | $                         | 63.71     |      | $ | 49.77    
|Average price/mcf |  | $                         | 6.53      |      | $ | 6.07     

As shown in the table above, total oil and gas sales decreased $604,934 (9.4%) for the six months ended
June 30, 2006 as compared to the six months ended June 30, 2005. Of this decrease, $82,063 and $1,084,544, respectively, were related to decreases in volumes of oil and gas sold. Volumes of oil and gas sold decreased 1,289 bbls of oil and
166,704 mcf of gas for the six months ended June 30, 2006 as compared to the six months ended June 30, 2005. The decrease in volumes of oil sold was primarily due to a substantial decline in the production of two wells. The decrease in
volumes of gas sold was primarily due to a substantial decline in the production of three wells and overall normal declines in production. The wells with a substantial decline in production are not expected to return to previous levels of
production. These decreases were partially offset by increases of $95,996 and $465,677, respectively, related to increases in the average prices of oil and gas sold. Average oil and gas prices increased to $63.71 per bbl and $6.53 per mcf for the
six months ended June 30, 2006 from $49.77 per bbl and $6.07 per mcf for the six months ended June 30, 2005.

Interest income. Interest income
was $9,022 during the six months ended June 30, 2006 as compared to $87,250 during the three month period ended June 30, 2005. The decrease is primarily due to the decrease in funds available for investment.

Lease operations and production taxes. Lease operating expense during the period ended June 30, 2006 totaled $227,168 as compared to $164,289 for the period ended
June 30, 2005. Production taxes during the period ended June 30, 2006 totaled $468,849 as compared to $540,165 for the period ended June 30, 2005. Lease operating expense increased primarily due to the addition of 16 new wells from
the period June 30, 2005 through June 30, 2006. The decrease in production taxes is due to the decrease in oil and gas revenues.

Depreciation,
depletion and amortization. Depreciation, depletion and amortization for the six month period ended June 30, 2006 total $1,953,239 compared to $2,368,250 for the six month period ended June 30, 2005. The decrease is due to the decline in
production volumes.

Cost ceiling write-down. There was a cost ceiling write-down of $1,925,612 for the six month period ended June 30, 2006. The cost
ceiling write-down was caused by lower gas prices at June 30, 2006. There was no cost ceiling write-down for the six month period ended June 30, 2005

Administrative and general expense. Administrative and general expense for the six month period ended June 30, 2006 total $392,087 compared to $220,297 for the period ended June 30, 2005. The overall increase is due to increased
administrative expenses allocated to the Partnership by MOC and higher general expenses for reporting costs.



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Item 3. Quantitative and Qualitative Disclosures about Market Risk

1. Interest Rate Risk

The Partnership Agreement allows borrowings from banks or other financial sources of up to 20% of the total capital contributions to the Partnership
without investor approval. Should the Partnership elect to borrow monies for additional development activity on Partnership properties, it will be subject to the interest rate risk inherent in borrowing activities. Changes in interest rates could
significantly affect the Partnerships results of operations and the amount of net cash flow available for partner distributions. Also, to the extent that changes in interest rates affect general economic conditions, the Partnership will be
affected by such changes.

2. Commodity Price Risk

The Partnership does not expect to engage in commodity futures trading or hedging activities or enter into derivative financial instrument transactions for trading or other speculative purposes. The Partnership
expects to sell a vast majority of its production from successful oil and gas wells on a month-to-month basis at current spot market prices. Accordingly, the Partnership is at risk for the volatility in commodity prices inherent in the oil and gas
industry, and the level of commodity prices will have a significant impact on the Partnerships results of operations.

3. Exchange Rate Risk

The Partnership currently has no income from foreign sources or operations in foreign countries that would subject it to
currency exchange rate risk. The Partnership does not currently expect to purchase any prospects located outside of either the United States or United States coastal waters in the Gulf of Mexico.

Item 4. Disclosure Controls and Procedures

MD maintains a system of controls and procedures designed to provide reasonable
assurance as to the reliability of the financial statements and other disclosures included in this report, as well as to safeguard assets from unauthorized use or disposition. MDs Chief Executive Officer and Chief Financial Officer have
evaluated the effectiveness of the design and operation of its disclosure controls and procedures with the assistance and participation of other members of management. Based upon that evaluation, MDs Chief Executive Officer and Chief Financial
Officer concluded that its disclosure controls and procedures are effective as of June 30, 2006 for gathering, analyzing and disclosing the information the Partnership is required to disclose in the reports it files under the Securities
Exchange Act of 1934 within the time periods specified in the SECs rules and forms. There were no changes in MDs internal controls over financial reporting that occurred during the most recent fiscal quarter that materially affected, or
are reasonably likely to materially affect, its internal controls over financial reporting.

Part II  Other Information

Item 1. Legal Proceedings

None.



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Item 6. Exhibits and Reports on Form 8-K



| | (a) | Exhibits filed herewith.
| | --- | ------------------------



|     |  |                                                                            
|---- |  | ---------------------------------------------------------------------------
|31.1 |  | Certification of CEO Pursuant to Section 302 of Sarbanes-Oxley Act of 2002.
|     | 
|31.2 |  | Certification of CFO Pursuant to Section 302 of Sarbanes-Oxley Act of 2002.
|     | 
|32.1 |  | Certification of CEO Pursuant to Section 906 of Sarbanes-Oxley Act of 2002.
|     | 
|32.2 |  | Certification of CFO Pursuant to Section 906 of Sarbanes-Oxley Act of 2002.



| | (b) | Reports on Form 8-K
| | --- | -------------------

None.



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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Partnership has duly caused this report to be signed on its behalf by the undersigned thereto duly authorized.



|                      |  |                                      |  |                                  
|--------------------- |  | ------------------------------------ |  | ---------------------------------
|                      |  | Mewbourne Energy Partners 04-A, L.P.
|                      |  |                                     
|                      |  | By:                                  |  | Mewbourne Development Corporation
|                      |  |                                      |  | Managing General Partner         
|Date: August 21, 2006 |  |                                      |  |                                  
|                      |  | By:                                  |  | /s/ Alan Clark                   
|                      |  |                                      |  | Alan Clark, Treasurer            



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INDEX TO EXHIBITS



|               |  |                                                                            
|-------------- |  | ---------------------------------------------------------------------------
|EXHIBIT NUMBER |  | DESCRIPTION                                                                
|               | 
|31.1           |  | Certification of CEO Pursuant to Section 302 of Sarbanes-Oxley Act of 2002.
|               | 
|31.2           |  | Certification of CFO Pursuant to Section 302 of Sarbanes-Oxley Act of 2002.
|               | 
|32.1           |  | Certification of CEO Pursuant to Section 906 of Sarbanes-Oxley Act of 2002.
|               | 
|32.2           |  | Certification of CFO Pursuant to Section 906 of Sarbanes-Oxley Act of 2002.



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