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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 June 30, 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 incorporation                or organization) | (I.R.S.                Employer 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 June 30, 2005 and December 31, 2004                (Unaudited)                                   | 3                                    |
|                        |                                                                                                                                 |                                 |
|                        | Statement                of Operations for the Three and Six Months ended June 30, 2005                (Unaudited)                   | 4                                    |
|                        |                                                                                                                                 |                                 |
|                        | Statement                of Partners’ Capital Accounts for the Six Months ended June                30, 2005 (Unaudited)  | 5                                    |
|                        |                                                                                                                                 |                                 |
|                        | Statement                of Cash Flows for the Six Months ended June 30,                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**              | 14                                                                                                                                   |
|                        |                                                                                                                                 |
| **CERTIFICATIONS**          | 15                - 18                                                                                                               |

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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)**

|                                                             |   | **June                30,** |       | **December                31,** |   |
|------------------------------------------------------------------|--------|-----------------------------|------------|---------------------------------|--------|
|                                                             |   | **2005**                    |       | **2004**                        |   |
|                                                             |   |                        |       |                            |   |
| **ASSETS**                                                       |   |                        |       |                            |   |
| Current                Assets:                                   |   |                        |            |                            |   |   |   |
| Cash                and cash equivalents                         |   | $                           | -          |                            | $      | 100 |   |
| Accounts                receivable - affiliate                   |   |                        | 3,921,800  |                            |   | 2,179,800 |   |
| Total                current assets                              |   |                        | 3,921,800  |                            |   | 2,179,900 |   |
|                                                             |   |                        |       |                            |   |   |   |
| Oil                and gas properties (successful efforts)  |   |                        | 37,703,800 |                            |   | 37,703,800 |   |
| Less                accumulated depletion and depreciation  |   |                        | (4,043,500 | )                               |   | (1,440,600 | ) |
|                                                             |   |                        | 33,660,300 |                            |   | 36,263,200 |   |
|                                                             |   | $                           | 37,582,100 |                            | $      | 38,443,100 |   |
|                                                             |   |                        |       |                            |   |   |   |
| **LIABILITIES                AND PARTNERS’ CAPITAL**       |   |                        |       |                            |   |   |   |
| Current                liabilities:                              |   |                        |       |                            |   |   |   |
| Accrued                liabilities                          |   | $                           | 15,300     |                            | $      | 2,800 |   |
| Total                current liabilities                         |   |                        | 15,300     |                            |   | 2,800 |   |
|                                                             |   |                        |       |                            |   |   |   |
| Asset                retirement obligation                  |   |                        | 683,300    |                            |   | 663,400 |   |
|                                                             |   |                        |       |                            |   |   |   |
|                                                             |   |                        |       |                            |   |   |   |
| Partners’                capital:                          |   |                        |       |                            |   |   |   |
| Managing                General Partner                     |   |                        | 9,860,000  |                            |   | 9,849,700 |   |
| Investor                Partners (1,106.76 units)           |   |                        | 27,023,500 |                            |   | 27,927,200 |   |
|                                                             |   |                        | 36,883,500 |                            |   | 37,776,900 |   |
|                                                             |   | $                           | 37,582,100 |                            | $      | 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** |      | **Six                Months Ended** |   |
|---------------------------------------------------------------------------|--------|---------------------------------------|-----------|-------------------------------------|--------|
|                                                                      |   | **June                30,**           |      | **June                30,**         |   |
|                                                                      |   | **2005**                              |      | **2005**                            |   |
| **REVENUES:**                                                             |   |                                  |      |                                |   |
| Natural                gas and oil sales                                  |   | $                                     | 3,476,200 |                                | $      | 5,830,300 |   |
| Total                revenues                                             |   |                                  | 3,476,200 |                                |   | 5,830,300 |   |
|                                                                      |   |                                  |      |                                |   |   |   |
| **COSTS                AND EXPENSES:**                                    |   |                                  |      |                                |   |   |   |
| Production                expenses                                   |   |                                  | 300,400   |                                |   | 501,200 |   |
| Depletion                and depreciation of oil and gas properties  |   |                                  | 1,557,400 |                                |   | 2,602,900 |   |
| Accretion                of asset retirement obligation              |   |                                  | 9,900     |                                |   | 19,900 |   |
| General                and administrative expenses                   |   |                                  | 44,000    |                                |   | 71,400 |   |
| Total                expenses                                             |   |                                  | 1,911,700 |                                |   | 3,195,400 |   |
| **Net                earnings**                                      |   | $                                     | 1,564,500 |                                | $      | 2,634,900 |   |
|                                                                      |   |                                  |      |                                |   |   |   |
|                                                                      |   |                                  |      |                                |   |   |   |
|                                                                      |   |                                  |      |                                |   |   |   |
|                                                                      |   |                                  |      |                                |   |   |   |
| **Allocation                of net earnings :**                           |   |                                  |      |                                |   |   |   |
| Managing                general partner                                   |   | $                                     | 741,900   |                                | $      | 1,245,200 |   |
| Investor                partners                                          |   | $                                     | 822,600   |                                | $      | 1,389,700 |   |
| Net                earnings per investor partnership unit                 |   | $                                     | 743       |                                | $      | 1,256 |   |

** **

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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      THE SIX MONTHS ENDED June 30, 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                  |   |         | 1,865,200  |         |   | 3,463,900  |   |   | 5,329,100 |   |
| Depletion                and depreciation               |   |         | (587,900   | )            |   | (2,015,000 | )      |   | (2,602,900 | ) |
| Accretion                of asset retirement obligation |   |         | (7,000     | )            |   | (12,900    | )      |   | (19,900 | ) |
| General                and administrative               |   |         | (25,100    | )            |   | (46,300    | )      |   | (71,400 | ) |
| Net                earnings                             |   |         | 1,245,200  |         |   | 1,389,700  |   |   | 2,634,900 |   |
|                                                    |   |         |       |         |   |       |   |   |   |   |
|                                                    |   |         |       |         |   |       |   |   |   |   |
| Distributions                                      |   |         | (1,234,900 | )            |   | (2,293,400 | )      |   | (3,528,300 | ) |
|                                                    |   |         |       |         |   |       |   |   |   |   |
| **Balance                at June 30, 2005**             |   | $            | 9,860,000  |         | $      | 27,023,500 |   | $ | 36,883,500 |   |

** **

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*Table            of Contents*

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

**STATEMENT      OF CASH FLOWS **

**(Unaudited)**

|                                                                                                              |   | **Six                Months Ended** |       |
|-------------------------------------------------------------------------------------------------------------------|--------|-------------------------------------|------------|
|                                                                                                              |   | **June                30,**         |       |
|                                                                                                              |   | **2005**                            |       |
| **Cash                flows from operating activities:**                                                          |   |                                |       |
| Net                earnings                                                                                       |   | $                                   | 2,634,900  |   |
| Adjustments                to reconcile net earnings to net cash provided by operating                activities: |   |                                |       |   |
| Depletion                and depreciation                                                                         |   |                                | 2,602,900  |   |
| Accretion                of asset retirement obligation                                                           |   |                                | 19,900     |   |
| Increase                in accounts receivable - affiliate                                                        |   |                                | (1,742,000 | ) |
| Increase                in accrued liabilities                                                                    |   |                                | 12,500     |   |
|                                                                                                              |   |                                |       |   |
| Net                cash provided by operating activities                                                     |   |                                | 3,528,200  |   |
|                                                                                                              |   |                                |       |   |
| **Cash                flows from financing activities:**                                                          |   |                                |       |   |
| Partners                distribution                                                                              |   |                                | (3,528,300 | ) |
|                                                                                                              |   |                                |       |   |
| Net                cash used in financing activities                                                              |   |                                | (3,528,300 | ) |
|                                                                                                              |   |                                |       |   |
| Net                decrease in cash and cash equivalents                                                     |   |                                | (100       | ) |
| Cash                and cash equivalents at beginning of period                                              |   |                                | 100        |   |
| Cash                and cash equivalents at end of period                                                    |   | $                                   | -          |   |

** **

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*Table            of Contents*

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

**NOTES      TO FINANCIAL STATEMENTS **

**June      30, 2005**

**(Unaudited)**

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

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

**Receivables**

**Revenue      Recognition**

**Recently      Issued Financial Accounting Standards**

*Accounting for Conditional      Asset Retirement Obligations*
*Accounting for Asset Retirement Obligations*

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*Table            of Contents*

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

**(A      Delaware Limited Partnership)**

**NOTES      TO FINANCIAL STATEMENTS **

**June      30, 2005**

**(Unaudited)**

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

**Recently      Issued Financial Accounting Standards -      (Continued)   **

**Fair      Value of Financial Instruments**

**Asset      Retirement Obligation**

|                                                                |   | **Three                  Months** |    | **Six                  Months** |   |
|---------------------------------------------------------------------|--------|-----------------------------------|---------|---------------------------------|--------|
|                                                                |   | **2005**                          |    | **2005**                        |   |
|                                                                |   |                              |    |                            |   |
| Asset                  retirement obligation at beginning of period |   | $                                 | 673,400 |                            | $      | 663,400 |   |
| Accretion                  expense                                  |   |                              | 9,900   |                            |   | 19,900 |   |
| Total                  asset retirement obligation at end of period |   | $                                 | 683,300 |                            | $      | 683,300 |   |

**Supplemental      Cash Flow Information**

**Credit      Risk**

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*Table            of Contents*

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

**(A      Delaware Limited Partnership)**

**NOTES      TO FINANCIAL STATEMENTS **

**June      30, 2005**

**(Unaudited)**

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

**Comprehensive      Income**

**Property      and Equipment**

|                                                        |   | **At                June 30,** |       | **At                December 31,** |   |
|-------------------------------------------------------------|--------|--------------------------------|------------|------------------------------------|--------|
|                                                        |   | **2005**                       |       | **2004**                           |   |
| Capitalized                costs of properties:             |   |                           |       |                               |   |   |   |
| Proved                properties                       |   | $                              | 873,800    |                               | $      | 873,800 |   |
| Wells                and related equipment             |   |                           | 36,830,000 |                               |   | 36,830,000 |   |
|                                                        |   |                           | 37,703,800 |                               |   | 37,703,800 |   |
|                                                        |   |                           |       |                               |   |   |   |
| Accumulated                depreciation and depletion  |   |                           | (4,043,500 | )                                  |   | (1,440,600 | ) |
|                                                        |   | $                              | 33,660,300 |                               | $      | 36,263,200 |   |

**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 and six months ended                June 30,                2005 were $23,500 and $41,600,                respectively. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| **· ** | 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 and six months ended June 30, 2005 were $87,200 and                $152,400, respectively. |
|------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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*Table          of Contents*

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

**(A      Delaware Limited Partnership)**

**NOTES      TO FINANCIAL STATEMENTS **

**June      30, 2005**

**(Unaudited)**

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

| ·   | 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 and six months                ended                June 30, 2005 were $143,200 and $245,400, respectively. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

**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*

**Results      of Operations**

|                                                                              |   | **Three                Months Ended** |   | **Six                Months Ended** |   |
|-----------------------------------------------------------------------------------|--------|---------------------------------------|--------|-------------------------------------|--------|
|                                                                              |   | **June                30,**           |   | **June                30,**         |   |
|                                                                              |   | **2005**                              |   | **2005**                            |   |
| Production                revenues (in thousands)                                 |   |                                  |   |                                |   |   |   |
| Gas                                                 |   | $                                     | 3,319  |                                | $      | 5,548 |   |
| Oil                                                                               |   | $                                     | 157    |                                | $      | 283 |   |
|                                                                              |   | $                                     | 3,476  |                                | $      | 5,831 |   |
| Production                volumes:                                                |   |                                  |   |                                |   |   |   |
| Gas                (thousands of cubic feet (“mcf”)/day)              |   |                                  | 5,119  |                                |   | 4,268 |   |
| Oil                (barrels (“bbls”)/day)                             |   |                                  | 33     |                                |   | 32 |   |
|                                                                              |   |                                  |   |                                |   |   |   |
| Average                sales prices:                                              |   |                                  |   |                                |   |   |   |
| Gas                (per mcf)                                                      |   | $                                     | 7.12   |                                | $      | 7.18 |   |
| Oil                (per bbl)                                                      |   | $                                     | 51.89  |                                | $      | 48.12 |   |
|                                                                              |   |                                  |   |                                |   |   |   |
| Average                production costs:                                          |   |                                  |   |                                |   |   |   |
| As                a percent of sales                                              |   |                                  | 9      | %               |   | 9 | % |
| Per                mcf equivalent unit ("mcfe")                                   |   | $                                     | .62    |                                | $      | .62 |   |
|                                                                              |   |                                  |   |                                |   |   |   |
| Depletion                per mcfe         |   | $                                     | 3.23   |                                | $      | 3.22 |   |

**Liquidity      and Capital Resources**

**Critical      Accounting Policies**

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*Table          of Contents*

**Recently      Issued Financial Accounting Standards    **

*Accounting for Conditional      Asset Retirement Obligations*
*Accounting for Asset Retirement Obligations*

**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 |

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*Table            of Contents*

**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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