##### Table of Contents

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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, 2007

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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##### Table of Contents

Mewbourne Energy Partners 04-A, L.P.

INDEX



|                               |  |                                                                                                                                                    |  |   
|------------------------------ |  | -------------------------------------------------------------------------------------------------------------------------------------------------- |  | --
|                               |  | Page No.                                                                                                                                          
|                               | 
|Part I  Financial Information |  |                                                                                                                                                   
|                               |  |                                                                                                                                                   
|Item 1.                        |  | Financial Statements                                                                                                                               |  |   
|                               |  |                                                                                                                                                   
|                               |  | Condensed Balance Sheets - June 30, 2007 (Unaudited) and December 31, 2006                                                                         |  | 3 
|                               |  |                                                                                                                                                   
|                               |  | Condensed Statements of Operations (Unaudited) - For the three months ended June 30, 2007 and 2006 and the six months ended June 30, 2007 and 2006 |  | 4 
|                               |  |                                                                                                                                                   
|                               |  | Condensed Statements of Cash Flows (Unaudited) - For the six months ended June 30, 2007 and 2006                                                   |  | 5 
|                               |  |                                                                                                                                                   
|                               |  | Condensed Statement of Changes In Partners Capital (Unaudited) - For the six months ended June 30, 2007                                           |  | 6 
|                               |  |                                                                                                                                                   
|                               |  | Notes to Condensed 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                                                                                                                                  |  | 14
|                               |  |                                                                                                                                                   
|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
|------- | --------------------

CONDENSED BALANCE SHEETS

June 30, 2007 and December 31, 2006



|                                                                      |  |               |             |   |                  |   |             |  
|--------------------------------------------------------------------- |  | ------------- | ----------- | - | ---------------- | - | ----------- | -
|                                                                      |  | June 30, 2007 |             |   | December 31,2006 |  
|                                                                      |  | (Unaudited)   |             |   |                  |  
|ASSETS                                                                |  |               |             |   |                  |   |             |  
|                                                                      |  |              
|Cash                                                                  |  | $             | 665         |   |                  | $ | 5,361       |  
|Accounts receivable, affiliate                                        |  |               | 1,357,072   |   |                  |   | 1,358,565   |  
|                                                                      |  |               |             |   |                  |   |             |  
|Total current assets                                                  |  |               | 1,357,737   |   |                  |   | 1,363,926   |  
|                                                                      |  |               |             |   |                  |   |             |  
|                                                                      |  |              
|Oil and gas properties at cost, full cost method                      |  |               | 29,722,885  |   |                  |   | 29,506,193  |  
|Less accumulated depreciation, depletion, amortization and impairment |  |               | (17,194,342 | ) |                  |   | (16,433,817 | )
|                                                                      |  |               |             |   |                  |   |             |  
|                                                                      |  |               | 12,528,543  |   |                  |   | 13,072,376  |  
|                                                                      |  |               |             |   |                  |   |             |  
|                                                                      |  |              
|Total assets                                                          |  | $             | 13,886,280  |   |                  | $ | 14,436,302  |  
|                                                                      |  |               |             |   |                  |   |             |  
|                                                                      |  |              
|LIABILITIES AND PARTNERS CAPITAL                                     |  |               |             |   |                  |   |             |  
|                                                                      |  |              
|Accounts payable, affiliate                                           |  | $             | 548,575     |   |                  | $ | 330,296     |  
|                                                                      |  |              
|Asset retirement obligation plugging liability                        |  |               | 398,498     |   |                  |   | 391,163     |  
|                                                                      |  |              
|Partners capital                                                     |  |               | 12,939,207  |   |                  |   | 13,714,843  |  
|                                                                      |  |               |             |   |                  |   |             |  
|                                                                      |  |              
|Total liabilities and partners capital                               |  | $             | 13,886,280  |   |                  | $ | 14,436,302  |  
|                                                                      |  |               |             |   |                  |   |             |  

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, 2007 and 2006 and

the six months ended June 30, 2007 and 2006

(Unaudited)



|                                                                                |  |                             |           |      |                           |            |      |  |      |           |  |   |          
|------------------------------------------------------------------------------- |  | --------------------------- | --------- | ---- | ------------------------- | ---------- | ---- |  | ---- | --------- |  | - | ---------
|                                                                                |  | Three Months Ended June 30, |           |      | Six Months Ended June 30,
|                                                                                |  | 2007                        |           | 2006 |                           |            | 2007 |  | 2006
|Revenues and other income:                                                      |  |                             |           |      |                           |            |      |  |      |           |  |   |          
|                                                                                |  |                             |           |     
|Oil and gas sales                                                               |  | $                           | 2,005,231 |      | $                         | 2,128,363  |      |  | $    | 3,847,938 |  | $ | 5,814,161
|Interest income                                                                 |  |                             | 902       |      |                           | 2,566      |      |  |      | 2,387     |  |   | 9,022    
|                                                                                |  |                             |           |      |                           |            |      |  |      |           |  |   |          
|Total revenues and other income                                                 |  |                             | 2,006,133 |      |                           | 2,130,929  |      |  |      | 3,850,325 |  |   | 5,823,183
|                                                                                |  |                             |           |      |                           |            |      |  |      |           |  |   |          
|                                                                                |  |                             |           |     
|Expenses:                                                                       |  |                             |           |      |                           |            |      |  |      |           |  |   |          
|                                                                                |  |                             |           |     
|Lease operating expense                                                         |  |                             | 134,473   |      |                           | 121,029    |      |  |      | 249,048   |  |   | 227,168  
|Production taxes                                                                |  |                             | 160,240   |      |                           | 167,599    |      |  |      | 306,844   |  |   | 468,849  
|Administrative and general expense                                              |  |                             | 75,872    |      |                           | 135,904    |      |  |      | 133,479   |  |   | 392,087  
|Depreciation, depletion, and amortization                                       |  |                             | 385,935   |      |                           | 831,226    |      |  |      | 760,525   |  |   | 1,953,239
|Cost ceiling write-down                                                         |  |                             |          |      |                           | 1,925,612  |      |  |      |          |  |   | 1,925,612
|Asset retirement obligation accretion                                           |  |                             | 3,668     |      |                           | 3,408      |      |  |      | 7,335     |  |   | 6,814    
|                                                                                |  |                             |           |      |                           |            |      |  |      |           |  |   |          
|                                                                                |  |                             |           |     
|Net income (loss):                                                              |  | $                           | 1,245,945 |      | $                         | (1,053,949 | )    |  | $    | 2,393,094 |  | $ | 849,414  
|                                                                                |  |                             |           |      |                           |            |      |  |      |           |  |   |          
|                                                                                |  |                             |           |     
|Allocation of net income (loss)                                                 |  |                             |           |      |                           |            |      |  |      |           |  |   |          
|General partners                                                                |  | $                           |          |      |                           |           |      |  | $    |          |  | $ |         
|                                                                                |  |                             |           |      |                           |            |      |  |      |           |  |   |          
|Limited partners                                                                |  | $                           | 1,245,945 |      | $                         | (1,053,949 | )    |  | $    | 2,393,094 |  | $ | 849,414  
|                                                                                |  |                             |           |      |                           |            |      |  |      |           |  |   |          
|Basic and diluted net income (loss) per interest (30,000 interests outstanding) |  | $                           | 41.53     |      | $                         | (35.13     | )    |  | $    | 79.77     |  | $ | 28.13    
|                                                                                |  |                             |           |      |                           |            |      |  |      |           |  |   |          

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



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Mewbourne Energy Partners 04-A, L.P.

CONDENSED STATEMENTS OF CASH FLOWS

For the six months ended June 30, 2007 and 2006

(Unaudited)



|                                                                                  |  |      |            |   |      |   |            |  
|--------------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- | -
|                                                                                  |  | 2007 |            |   | 2006 |  
|Cash flows from operating activities:                                             |  |      |            |   |      |   |            |  
|Net income                                                                        |  | $    | 2,393,094  |   |      | $ | 849,414    |  
|Adjustments to reconcile net income to net cash provided by operating activities: |  |      |            |   |      |   |            |  
|Depreciation, depletion, and amortization                                         |  |      | 760,525    |   |      |   | 1,953,239  |  
|Cost ceiling write-down                                                           |  |      |           |   |      |   | 1,925,612  |  
|Asset retirement obligation accretion                                             |  |      | 7,335      |   |      |   | 6,814      |  
|Changes in operating assets and liabilities:                                      |  |      |            |   |      |   |            |  
|Accounts receivable, affiliate                                                    |  |      | 1,493      |   |      |   | 2,721,469  |  
|Accounts receivable, other                                                        |  |      |           |   |      |   | 1,684      |  
|Accounts payable, affiliate                                                       |  |      | 218,279    |   |      |   | 86,932     |  
|                                                                                  |  |      |            |   |      |   |            |  
|Net cash provided by operating activities                                         |  |      | 3,380,726  |   |      |   | 7,545,164  |  
|                                                                                  |  |      |            |   |      |   |            |  
|                                                                                  |  |     
|Cash flows from investing activities:                                             |  |      |            |   |      |   |            |  
|Purchase and development of oil and gas properties                                |  |      | (216,692   | ) |      |   | (366,457   | )
|                                                                                  |  |      |            |   |      |   |            |  
|Net cash used in investing activities                                             |  |      | (216,692   | ) |      |   | (366,457   | )
|                                                                                  |  |      |            |   |      |   |            |  
|                                                                                  |  |     
|Cash flows from financing activities:                                             |  |      |            |   |      |   |            |  
|Cash distributions to partners                                                    |  |      | (3,168,730 | ) |      |   | (7,467,911 | )
|                                                                                  |  |      |            |   |      |   |            |  
|Net cash used in financing activities                                             |  |      | (3,168,730 | ) |      |   | (7,467,911 | )
|                                                                                  |  |      |            |   |      |   |            |  
|                                                                                  |  |     
|Net decrease in cash                                                              |  |      | (4,696     | ) |      |   | (289,204   | )
|                                                                                  |  |     
|Cash, beginning of period                                                         |  |      | 5,361      |   |      |   | 333,699    |  
|                                                                                  |  |      |            |   |      |   |            |  
|                                                                                  |  |     
|Cash, end of period                                                               |  | $    | 665        |   |      | $ | 44,495     |  
|                                                                                  |  |      |            |   |      |   |            |  

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



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Mewbourne Energy Partners 04-A, L.P.

CONDENSED STATEMENT OF CHANGES IN PARTNERS CAPITAL

For the six months ended June 30, 2007

(Unaudited)



|                             |  |                  |            |  
|---------------------------- |  | ---------------- | ---------- | -
|                             |  | PartnersCapital |           
|Balance at December 31, 2006 |  | $                | 13,714,843 |  
|Cash distributions           |  |                  | (3,168,730 | )
|Net income                   |  |                  | 2,393,094_ |  
|                             |  |                  |            |  
|Balance at June 30, 2007     |  | $                | 12,939,207 |  
|                             |  |                  |            |  

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



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Mewbourne Energy Partners 04-A, L.P.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(Unaudited)



|1. | Accounting Policies
|-- | -------------------

Reference is hereby made to the Registrants
Annual Report on Form 10-K for 2006, 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 Program, (the Program), 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. In
accordance with the laws of the State of Delaware, Mewbourne Development Corporation (MD), a Delaware Corporation, has been appointed as the Partnerships managing general partner. MD has no equity interest in the Partnership.

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, 2007 and 2006 all capitalized costs were subject to 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.



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|3. | 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 six months ended
June 30, 2007 and for the year ended December 31, 2006 is as follows:



|                             |  |      |         |      |   |        
|---------------------------- |  | ---- | ------- | ---- | - | -------
|                             |  | 2007 |         | 2006
|Balance, beginning of period |  | $    | 391,163 |      | $ | 377,536
|Accretion expense            |  |      | 7,335   |      |   | 13,627 
|                             |  |      |         |      |   |        
|Balance, end of period       |  | $    | 398,498 |      | $ | 391,163
|                             |  |      |         |      |   |        



|4. | Related Party Transactions
|-- | --------------------------

In accordance with the laws of the State of
Delaware, Mewbourne Development Corporation (MD), a Delaware Corporation, has been appointed as the Partnerships managing general partner. MD has no equity interest in the Partnership. 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 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% of the subscriptions by the
investor partners to the partnership. Effective January 1, 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 (1)                                                                    |  | 0           | % |  | 100 | %
|Lease acquisition costs (1)                                                                            |  | 0           | % |  | 100 | %
|Tangible and intangible drilling costs (1)                                                             |  | 100         | % |  | 0   | %
|Operating costs, reporting and legal expenses, general and administrative expenses and all other costs |  | 70          | % |  | 30  | %

---

|(1) | 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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##### Table of Contents

|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.

The Partnership has acquired interests in oil and gas prospects for the purpose of development drilling. The Partnership participated in the drilling of 79 wells. 74 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 $809,162 at June 30, 2007.

During the six months ended June 30, 2007, the Partnership made cash
distributions to the investor partners in the amount of $3,168,730 as compared to $7,467,911 for the six months ended June 30, 2006. The Partnership expects that cash distributions will continue during 2007 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, 2007 as compared to the three months ended June 30, 2006.

Oil and gas revenues.



|                  |  |                             |           |      |   |          
|----------------- |  | --------------------------- | --------- | ---- | - | ---------
|                  |  | Three Months Ended June 30,
|                  |  | 2007                        |           | 2006
|Oil and gas sales |  | $                           | 2,005,231 |      | $ | 2,128,363
|Barrels produced  |  |                             | 1,788     |      |   | 2,534    
|Mcf produced      |  |                             | 268,165   |      |   | 348,358  
|Average price/bbl |  | $                           | 60.77     |      | $ | 67.55    
|Average price/mcf |  | $                           | 7.07      |      | $ | 5.62     

As shown in the table above, total oil and gas sales decreased $123,132 (5.8%) for the three months ended
June 30, 2007 as compared to the three months ended June 30, 2006. Of this decrease, $45,368 and $566,307, respectively, were related to decreases in volumes of oil and gas sold. Volumes of oil and gas sold decreased 746 bbls of oil and
80,193 mcf of gas for the three months ended June 30, 2007 as compared to the three months ended June 30, 2006. An additional decrease of $17,180 was related to a decrease in the average price of oil sold. Average oil prices decreased to
$60.77 per bbl for the three months ended June 30, 2007 from $67.55 per bbl for the three months ended June 30, 2006. The decrease in volumes of oil sold was primarily due to a substantial decline in the production of one well. The
decrease in volumes of gas sold was primarily due to a substantial decline in the production of two wells and to 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 an increase of $505,723 related to an increase in the average price of gas sold. Average gas prices increased to $7.07 per mcf for the three months ended June 30, 2007 from $5.62 per mcf for
the three months ended June 30, 2006.

Interest income. Interest income was $902 during the three months ended June 30, 2007 as compared to
$2,566 during the three month period ended June 30, 2006. 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, 2007 totaled $134,473 as compared to $121,029 for the period ended June 30, 2006. Lease operating expense increased primarily due to increased well
service and repairs to one well. Production taxes during the period ended June 30, 2007 totaled $160,240 as compared to $167,599 for the period ended 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, 2007 total
$385,935 compared to $831,226 for the three month period ended June 30, 2006. The decrease is due to the decrease in production volumes.

Cost ceiling
write-down. There was no cost ceiling write-down for the three month period ended June 30, 2007. There was a cost ceiling write-down of $1,925,612 for the three month period ended June 30, 2006, which was caused by the lower gas price at
June 30, 2006.

Administrative and general expense. Administrative and general expense for the three month period ended June 30, 2007 totaled
$75,872 compared to $135,904 for the period ended June 30, 2006. The overall decrease is due to decreased administrative charges caused by decreased oil and gas revenues. The decrease was also related to lower general expenses for reporting
costs.



11



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##### Table of Contents

Six months ended June 30, 2007 as compared to the six months ended June 30, 2006.

Oil and gas revenues.



|                  |  |                           |           |      |   |          
|----------------- |  | ------------------------- | --------- | ---- | - | ---------
|                  |  | Six months Ended June 30,
|                  |  | 2007                      |           | 2006
|Oil and gas sales |  | $                         | 3,847,938 |      | $ | 5,814,161
|Barrels produced  |  |                           | 3,777     |      |   | 5,599    
|Mcf produced      |  |                           | 525,893   |      |   | 835,125  
|Average price/bbl |  | $                         | 58.14     |      | $ | 63.71    
|Average price/mcf |  | $                         | 6.90      |      | $ | 6.53     

As shown in the table above, total oil and gas sales decreased $1,966,223 (33.8%) for the six months ended
June 30, 2007 as compared to the six months ended June 30, 2006. Of this decrease, $105,944 and $2,134,030, respectively, were related to decreases in volumes of oil and gas sold. Volumes of oil and gas sold decreased 1,822 bbls of oil and
309,232 mcf of gas for the six months ended June 30, 2007 as compared to the six months ended June 30, 2006. An additional decrease of $31,212 was related to a decrease in the average price of oil sold. Average oil prices decreased to
$58.14 per bbl for the six months ended June 30, 2007 from $63.71 per bbl for the six months ended June 30, 2006. The decrease in volumes of oil sold was primarily due to a substantial decline in the production of one well. The decrease in
volumes of gas sold was primarily due to a substantial decline in the production of two wells and to 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 an increase of $304,962 related to an increase in the average price of gas sold. Average gas prices increased to $6.90 per mcf for the six months ended June 30, 2007 from $6.53 per mcf for the six months ended
June 30, 2006.

Interest income. Interest income was $2,387 during the six months ended June 30, 2007 as compared to $9,022 during the six month
period ended June 30, 2006. The decrease is primarily due to the decrease in funds available for investment.

Lease operations and production taxes.
Lease operating expense during the six month period ended June 30, 2007 totaled $249,048 as compared to $227,168 for the period ended June 30, 2006. Production taxes during the period ended June 30, 2007 totaled $306,844 as compared
to $468,849 for the period ended June 30, 2006. Lease operating expense increased primarily due to the addition of two new wells from the period June 30, 2006 through June 30, 2007. 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, 2007 total $760,525 compared to $1,953,239 for the six month period ended June 30, 2006. The decrease is due to the decline in production volumes.

Cost ceiling write-down. There was no cost ceiling write-down for the six month period ended June 30, 2007. There was a cost ceiling write-down of $1,925,612 for the six month period ended June 30, 2006,
which was caused by the lower gas price at June 30, 2006.

Administrative and general expense. Administrative and general expense for the six month
period ended June 30, 2007 total $133,479 compared to $392,087 for the period ended June 30, 2006. The overall decrease is due to decreased administrative expenses allocated to the Partnership by MOC and higher general expenses
for reporting costs.



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##### Table of Contents

|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 currently expects to sell a vast majority of its production from successful
oil and gas wells on a month-to-month basis at 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. For the six months ended June 30, 2007, a 10% change in the price received for natural gas production would have had an approximate $363,000 impact on our revenue.



|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 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 have been no changes in MDs internal controls for the quarter ended June 30, 2007 or in other factors which have materially
affected, or are reasonably likely to materially affect the internal controls over financial reporting.



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##### Table of Contents

Part II  Other Information



|Item 1. | Legal Proceedings
|------- | -----------------

None.



|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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##### Table of Contents

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 14, 2007 |  |  |  |                                      |  |                                     
|                      |  |  |  | By:                                  |  | /s/ Alan Clark                      
|                      |  |  |  |                                      |  | Alan Clark, Treasurer and
Controller



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##### Table of Contents

INDEX TO EXHIBITS



|              |  |                                                                            
|------------- |  | ---------------------------------------------------------------------------
|EXHIBITNUMBER |  | 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.



16