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**United        States Securities and Exchange Commission**

**Washington,        D.C. 20549**

**Form        10-QSB**

| x      | **QUARTERLY                  REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE** |   |
|--------|------------------------------------------------------------------------------|--------|
|   | **SECURITIES                  EXCHANGE ACT OF 1934**                         |   |
|   | For                  the quarterly period ended March 31, 2005               |   |
|   |                                                                         |   |
| o      | **TRANSITION                  REPORT UNDER SECTION 13 OR 15(d) OF THE**      |   |
|   | **SECURITIES                  EXCHANGE ACT OF 1934**                         |   |

**ATLAS        AMERICA SERIES 25-2004(A) L.P.**

| **Delaware**                                              | **55-0856393**                       |
|-----------------------------------------------------------|--------------------------------------|
| (State                  or other jurisdiction of          | (I.R.S.                  Employer    |
| incorporation                  or organization)           | Identification                  No.) |
| 311                  Rouser Road                          |                                 |
| Moon                  Township, PA                        | 15108                                |
| (Address                  of principal executive offices) | (Zip                  code)          |

**(412)        262-2830**

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**ATLAS        AMERICA SERIES 25-2004(A) L.P.**

**(A        Delaware Limited Partnership)**

**INDEX        TO QUARTERLY REPORT**

**ON        FORM 10QSB**

|                          |                                                                                                                                                         | **PAGE**                                 |
|-------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------|
| **PART                  I.**  | **FINANCIAL                  INFORMATION**                                                                                                                   |                                     |
|                          |                                                                                                                                                         |                                     |
| Item                  1.      | Financial                  Statements                                                                                                                        |                                     |
|                          |                                                                                                                                                         |                                     |
|                          | Balance                  Sheets as of March 31, 2005 and December 31, 2004                  (Unaudited)                                                      | 3                                        |
|                          |                                                                                                                                                         |                                     |
|                          | Statement                  of Operations for the Three Months ended March 31,                  2005 (Unaudited)                                              | 4                                        |
|                          |                                                                                                                                                         |                                     |
|                          | Statement                  of Partners’                  Capital                  Accounts for the Three Months ended March 31, 2005 (Unaudited)  | 5                                        |
|                          |                                                                                                                                                         |                                     |
|                          | Statement                  of Cash Flows for the Three Months ended March 31,                  2005 (Unaudited)                                              | 6                                        |
|                          |                                                                                                                                                         |                                     |
|                          | Notes                  to Financial Statements                  (Unaudited)                                                                                  | 7                  -                  10 |
|                          |                                                                                                                                                         |                                     |
| Item                  2.      | Management’s                  Discussion and Analysis of Financial Condition                  and Results of Operations                                | 10                  - 12                 |
|                          |                                                                                                                                                         |                                     |
| Item                  3.      | Controls                  and Procedures                                                                                                                     | 12                                       |
|                          |                                                                                                                                                         |                                     |
| **PART                  II.** | **OTHER                  INFORMATION**                                                                                                                       |                                     |
|                          |                                                                                                                                                         |                                     |
| Item                  6.      | Exhibits                                                                                                                                                     | 13                                       |
|                          |                                                                                                                                                         |                                     |
|                          |                                                                                                                                                         |                                     |
| **SIGNATURES**                | 13                                                                                                                                                           |
|                          |                                                                                                                                                         |
| **CERTIFICATIONS**            | 14                  - 17                                                                                                                                     |

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*Table            of Contents*

**PART        I**

**ITEM        1.**
**FINANCIAL        STATEMENTS**

**ATLAS        AMERICA SERIES 25-2004(A) L.P.**

**(A        Delaware Limited Partnership)**

**BALANCE        SHEETS**

**(Unaudited)**

|                                                               |   | **March                  31,** |       | **December                  31,** |   |
|--------------------------------------------------------------------|--------|--------------------------------|------------|-----------------------------------|--------|
|                                                               |   | **2005**                       |       | **2004**                          |   |
|                                                               |   |                           |       |                              |   |
| **ASSETS**                                                         |   |                           |       |                              |   |
| Current                  Assets:                                   |   |                           |       |                              |   |
| Cash                  and cash equivalents                         |   | $                              | 786,700    |                              | $      | 100 |   |
| Accounts                  receivable - affiliate                   |   |                           | 2,189,400  |                              |   | 2,179,800 |   |
| Total                  current assets                              |   |                           | 2,976,100  |                              |   | 2,179,900 |   |
|                                                               |   |                           |       |                              |   |   |   |
| Oil                  and gas properties (successful efforts)  |   |                           | 37,703,800 |                              |   | 37,703,800 |   |
| Less                  accumulated depletion and depreciation       |   |                           | (2,486,100 | )                                 |   | (1,440,600 | ) |
|                                                               |   |                           | 35,217,700 |                              |   | 36,263,200 |   |
|                                                               |   | $                              | 38,193,800 |                              | $      | 38,443,100 |   |
|                                                               |   |                           |       |                              |   |   |   |
|                                                               |   |                           |       |                              |   |   |   |
| **LIABILITIES                  AND PARTNERS’ CAPITAL**       |   |                           |       |                              |   |   |   |
| Current                  liabilities:                              |   |                           |       |                              |   |   |   |
| Accrued                  liabilities                          |   | $                              | 10,900     |                              | $      | 2,800 |   |
| Total                  current liabilities                         |   |                           | 10,900     |                              |   | 2,800 |   |
|                                                               |   |                           |       |                              |   |   |   |
| Asset                  retirement obligation                  |   |                           | 673,400    |                              |   | 663,400 |   |
|                                                               |   |                           |       |                              |   |   |   |
|                                                               |   |                           |       |                              |   |   |   |
| Partners’                  capital:                          |   |                           |       |                              |   |   |   |
| Managing                  General Partner                          |   |                           | 9,884,700  |                              |   | 9,849,700 |   |
| Investor                  Partners (1,106.76 units)                |   |                           | 27,624,800 |                              |   | 27,927,200 |   |
|                                                               |   |                           | 37,509,500 |                              |   | 37,776,900 |   |
|                                                               |   | $                              | 38,193,800 |                              | $      | 38,443,100 |   |

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*Table            of Contents*

**ATLAS        AMERICA SERIES 25-2004(A) L.P.**

**(A        Delaware Limited Partnership)**

**STATEMENT        OF OPERATIONS **

**(Unaudited)**

|                                                                        |   | **Three                  Months Ended** |      |
|-----------------------------------------------------------------------------|--------|-----------------------------------------|-----------|
|                                                                        |   | **March                  31,**          |      |
|                                                                        |   | **2005**                                |      |
| **REVENUES:**                                                               |   |                                    |      |
| Natural                  gas and oil sales                                  |   | $                                       | 2,354,100 |   |
| Total                  revenues                                             |   |                                    | 2,354,100 |   |
|                                                                        |   |                                    |      |   |
| **COSTS                  AND EXPENSES:**                                    |   |                                    |      |   |
| Production                  expenses                                   |   |                                    | 200,800   |   |
| Depletion                  and depreciation of oil and gas properties  |   |                                    | 1,045,500 |   |
| Accretion                  of asset retirement obligation              |   |                                    | 10,000    |   |
| General                  and administrative expenses                   |   |                                    | 27,400    |   |
| Total                  expenses                                             |   |                                    | 1,283,700 |   |
| **Net                  earnings**                                      |   | $                                       | 1,070,400 |   |
|                                                                        |   |                                    |      |   |
|                                                                        |   |                                    |      |   |
|                                                                        |   |                                    |      |   |
|                                                                        |   |                                    |      |   |
| **Allocation                  of net earnings :**                           |   |                                    |      |   |
|                                                                        |   |                                    |      |   |
| Managing                  general partner                                   |   | $                                       | 503,300   |   |
| Investor partners                                                      |   | $                                       | 567,100   |   |
| Net                  earnings per investor partnership unit            |   | $                                       | 512       |   |

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*Table            of Contents*

**ATLAS        AMERICA SERIES 25-2004(A) L.P.**

**(A        Delaware Limited Partnership)**

**STATEMENT        OF PARTNERS’ CAPITAL ACCOUNTS **

**FOR        THREE MONTHS ENDED March 31, 2005**

**(Unaudited)**

|                                                      |   | **Managing** |      |         |   |       |   |
|-----------------------------------------------------------|--------|--------------|-----------|--------------|--------|------------|--------|
|                                                      |   | **General**  |      | **Investor** |   |       |   |
|                                                      |   | **Partner**  |      | **Partners** |   | **Total**  |   |
| **Balance                  at January 1, 2005**           |   | $            | 9,849,700 |         | $      | 27,927,200 |   | $ | 37,776,900 |   |
|                                                      |   |         |      |         |   |       |   |   |   |   |
| Participation                  in revenues and expenses:  |   |         |           |         |   |            |   |   |  |   |
| Net                  production revenues                  |   |         | 753,600   |         |   | 1,399,700  |   |   | 2,153,300 |   |
| Depletion                  and depreciation               |   |         | (237,300  | )            |   | (808,200   | )      |   | (1,045,500 | ) |
| Accretion                  of asset retirement obligation |   |         | (3,500    | )            |   | (6,500     | )      |   | (10,000 | ) |
| General                  and administrative               |   |         | (9,500    | )            |   | (17,900    | )      |   | (27,400 | ) |
| Net                  earnings                             |   |         | 503,300   |         |   | 567,100    |   |   | 1,070,400 |   |
|                                                      |   |         |      |         |   |       |   |   |   |   |
|                                                      |   |         |      |         |   |       |   |   |   |   |
| Distributions                                        |   |         | (468,300  | )            |   | (869,500   | )      |   | (1,337,800 | ) |
|                                                      |   |         |      |         |   |       |   |   |   |   |
| **Balance                  at March 31, 2005**            |   | $            | 9,884,700 |         | $      | 27,624,800 |   | $ | 37,509,500 |   |

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*Table            of Contents*

**ATLAS        AMERICA SERIES 25-2004(A) L.P.**

**(A        Delaware Limited Partnership)**

**STATEMENT        OF CASH FLOWS **

**(Unaudited)**

|                                                                                                                  |   | **Three                  Months Ended** |       |
|-----------------------------------------------------------------------------------------------------------------------|--------|-----------------------------------------|------------|
|                                                                                                                  |   | **March                  31,**          |       |
|                                                                                                                  |   | **2005**                                |       |
| **Cash                  flows from operating activities:**                                                            |   |                                    |       |
| Net                  earnings                                                                                         |   | $                                       | 1,070,400  |   |
| Adjustments                  to reconcile net earnings to net cash provided by operating                  activities: |   |                                    |       |   |
| Depletion                  and depreciation                                                                           |   |                                    | 1,045,500  |   |
| Accretion                  of asset retirement obligation                                                             |   |                                    | 10,000     |   |
| Increase                  in accounts receivable - affiliate                                                          |   |                                    | (9,600     | ) |
| Increase                  in accrued liabilities                                                                      |   |                                    | 8,100      |   |
|                                                                                                                  |   |                                    |            |   |
| Net                  cash provided by operating activities                                                       |   |                                    | 2,124,400  |   |
|                                                                                                                  |   |                                    |       |   |
| **Cash                  flows from financing activities:**                                                            |   |                                    |       |   |
| Partners                  distribution                                                                                |   |                                    | (1,337,800 | ) |
|                                                                                                                  |   |                                    |       |   |
| Net                  cash used in financing activities                                                                |   |                                    | (1,337,800 | ) |
|                                                                                                                  |   |                                    |       |   |
| Net                  increase in cash and cash equivalents                                                       |   |                                    | 786,600    |   |
| Cash                  and cash equivalents at beginning of period                                                |   |                                    | 100        |   |
| Cash                  and cash equivalents at end of period                                                      |   | $                                       | 786,700    |   |

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*Table            of Contents*

**ATLAS        AMERICA SERIES 25-2004(A) L.P.**

**(A        Delaware Limited Partnership)**

**NOTES        TO FINANCIAL STATEMENTS **

**March        31, 2005**

**(Unaudited)**

**NOTE        1 **
**-**
**        BASIS OF PRESENTATION**

**NOTE        2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES**

**Receivables**

**Revenue        Recognition**

**Recently        Issued Financial Accounting Standards    **

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*Table            of Contents*

**ATLAS        AMERICA SERIES 25-2004(A) L.P.**

**(A        Delaware Limited Partnership)**

**NOTES        TO FINANCIAL STATEMENTS **

**March        31, 2005**

**(Unaudited)**

**NOTE        2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (**
**continued)**

**Recently        Issued Financial Accounting Standards        (continued)   **

**Fair        Value of Financial Instruments**

**Asset        Retirement Obligation**

|                                                                |   | **2005** |    |
|---------------------------------------------------------------------|--------|----------|---------|
|                                                                |   |     |    |
| Asset                  retirement obligation at beginning of period |   | $        | 663,400 |   |
| Accretion                  expense                                  |   |     | 10,000  |   |
| Total                  asset retirement obligation at end of period |   | $        | 673,400 |   |

**Supplemental        Cash Flow Information**

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*Table            of Contents*

**ATLAS        AMERICA SERIES 25-2004(A) L.P.**

**(A        Delaware Limited Partnership)**

**NOTES        TO FINANCIAL STATEMENTS **

**March        31, 2005**

**(Unaudited)**

**NOTE        2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (**
**continued)**

**Credit        Risk**

**Comprehensive        Income**

**Property        and Equipment**

|                                                          |   | **At                  March 31,** |       |
|---------------------------------------------------------------|--------|-----------------------------------|------------|
|                                                          |   | **2005**                          |       |
| Capitalized                  costs of properties:             |   |                              |       |
| Proved                  properties                       |   | $                                 | 873,800    |   |
| Wells                  and related equipment             |   |                              | 36,830,000 |   |
|                                                          |   |                              | 37,703,800 |   |
|                                                          |   |                              |       |   |
| Accumulated                  depreciation and depletion  |   |                              | (2,486,100 | ) |
|                                                          |   | $                                 | 35,217,700 |   |

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*Table            of Contents*

**ATLAS        AMERICA SERIES 25-2004(A) L.P.**

**(A        Delaware Limited Partnership)**

**NOTES        TO FINANCIAL STATEMENTS **

**March        31, 2005**

**(Unaudited)**

**NOTE        3 **
**-**
**        TRANSACTIONS WITH ATLAS RESOURCES, INC. AND ITS AFFILIATES**

|   | · | Administrative                  costs which are included in general and administrative expenses                  in the                  Statement of Operations are payable to Atlas at $75 per well per                  month.                  Administrative costs incurred for the three months ended March                  31, 2005                  were $18,100. |
|--------|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | Monthly                  well supervision fees which are included in production expenses                  in the                  Statement of Operations are payable to Atlas at $275 per well per                  month                  for operating and maintaining the wells. Well supervision fees                  incurred                  for the three months ended March 31, 2005 were                  $65,200. |
|--------|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | Transportation                  fees which are included in production expenses in the Statement                  of                  Operations are payable to Atlas at $.29 - $.35 per mcf (one thousand                  cubic                  feet). Transportation costs incurred for the three months ended                  March 31,                  2005 were $102,200. |
|--------|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

**Major        Customers**

**Subordination          of Managing General Partner's Revenue Share**

**ITEM        2. MANAGEMENT’S DISCUSSION AND ANALYSIS AND RESULTS OF        OPERATIONS (UNAUDITED)**

**Forward-Looking        Statements**

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*Table            of Contents*

**ITEM        2. MANAGEMENT’S DISCUSSION AND ANALYSIS AND RESULTS OF OPERATIONS (UNAUDITED) -        (continued)**

**Results        of Operations**

|                                                                         |   | **Three                  Months Ended** |   |
|------------------------------------------------------------------------------|--------|-----------------------------------------|--------|
|                                                                         |   | **March                  31,**          |   |
|                                                                         |   | **2005**                                |   |
| Production                  revenues (in thousands)                          |   |                                    |   |
| Gas                                                                          |   | $                                       | 2,228  |   |
| Oil                                                                          |   | $                                       | 126    |   |
|                                                                         |   |                                    |   |   |
| Production                  volumes:                                         |   |                                    |   |   |
| Gas                  (thousands of cubic feet (“mcf”)/day)  |   |                                    | 3,407  |   |
| Oil                  (barrels (“bbls”)/day)                 |   |                                    | 32     |   |
|                                                                         |   |                                    |   |   |
| Average                  sales prices:                                       |   |                                    |   |   |
| Gas                  (per mcf)                                          |   | $                                       | 7.27   |   |
| Oil                  (per bbl)                                          |   | $                                       | 44.12  |   |
|                                                                         |   |                                    |   |   |
| Average                  production costs:                                   |   |                                    |   |   |
| As                  a percent of sales                                  |   |                                    | 9      | % |
| (per                  mcf equivalent unit)                              |   | $                                       | .62    |   |
|                                                                         |   |                                    |   |   |
| Depletion                  per mcfe                                          |   | $                                       | 3.23   |   |

**Liquidity        and Capital Resources**

**Critical        Accounting Policies**

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*Table            of Contents*

**ITEM        2. MANAGEMENT’S DISCUSSION AND ANALYSIS AND RESULTS OF OPERATIONS (UNAUDITED) -        (continued)**

**Critical        Accounting Policies (continued)**

**Recently        Issued Financial Accounting Standards    **

**ITEM        3.    CONTROLS AND        PROCEDURES**

**Evaluation        of Disclosure Controls and Procedures**

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*Table            of Contents*

**PART        II.**
**OTHER        INFORMATION**

**ITEM        6.   Exhibits**

**EXHIBIT        INDEX**

| **Exhibit                  No.** |   | **Description**                                                                                                                                                           |
|----------------------------------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                             |   |                                                                                                                                                                      |
| 31.1                             |   | Certification                  Pursuant to Rule 13a-14/15(d)-14.                                                                                                          |
| 31.2                             |   | Certification                  Pursuant to Rule 13a-14/15(d)-14.                                                                                                          |
| 32.1                             |   | Certification                  Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section                  906 of                  the Sarbanes-Oxley Act of 2002 |
| 32.2                             |   | Certification                  Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section                  906 of                  the Sarbanes-Oxley Act of 2002 |

**SIGNATURES**

| By:    | (Signature                  and Title): |   | Atlas                  Resources, Inc., Managing General Partner       |
|--------|-----------------------------------------|--------|------------------------------------------------------------------------|
|   |                                    |   |                                                                   |
|   |                                    |   |                                                                   |
| By     | (Signature                  and Title): |   | /s/                  Freddie M. Kotek                                  |
|   |                                    |   | Freddie                  M. Kotek, Chairman of the Board of Directors, |
|   |                                    |   | Chief                  Executive Officer and President                 |

| By     | (Signature                  and Title): |   | /s/                  Freddie M. Kotek                                  |
|--------|-----------------------------------------|--------|------------------------------------------------------------------------|
|   |                                    |   | Freddie                  M. Kotek, Chairman of the Board of Directors, |
|   |                                    |   | Chief                  Executive Officer and President                 |

| By     | (Signature                  and Title): |   | /s/                  Nancy J. McGurk                                                   |
|--------|-----------------------------------------|--------|----------------------------------------------------------------------------------------|
|   |                                    |   | Nancy                  J. McGurk, Senior Vice President,                               |
|   |                                    |   | Chief                  Financial Officer and Chief Accounting                  Officer |

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