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

|                     |                                 |
|--------------------------|--------------------------------------|
| Nevada                   | 95-2636730                           |
| (State of Incorporation) | (I.R.S. Employer Identification No.) |
|                     |                                 |

| Title of Each Class                    |   | Name of Each Exchange on Which Registered |
|----------------------------------------|--------|-------------------------------------------|
| Common Stock, par value $.01 per share |   | NASDAQ Global Select Market               |

----

| Large accelerated filer | ¨                                               |   | Accelerated filer         | þ |
|-------------------------|------------------------------------------------------|--------|---------------------------|--------|
|                    |                                                 |   |                      |   |
| Non-accelerated filer   | ¨ (Do not check if a smaller reporting company) |   | Smaller reporting company | ¨ |

----

----

| PETROLEUM DEVELOPMENT CORPORATION                                                     |
|---------------------------------------------------------------------------------------|
|                                                                                  |
| By:  /s/ Richard W. McCullough                                              |
| Richard W. McCullough,Chairman, Chief Executive Officer, and PresidentAugust 31, 2010 |

|   | Signature                                                                          | Title                                                                         |  Date      |
|--------|------------------------------------------------------------------------------------|-------------------------------------------------------------------------------|-----------------|
|   |                                                                               |                                                                          |            |
|   | /s/ Richard W. McCullough      Richard W. McCullough | Chairman, Chief Executive Officer, and President(principal executive officer) | August 31, 2010 |
|   |                                                                               |                                                                          |            |
|   | /s/ Gysle R. Shellum      Gysle R. Shellum           | Chief Financial Officer (principal financial officer)                         | August 31, 2010 |
|   |                                                                               |                                                                          |            |
|   | /s/ R. Scott Meyers      R. Scott Meyers             | Chief Accounting Officer (principal accounting officer)                       | August 31, 2010 |
|   |                                                                               |                                                                          |            |
|   | /s/ Daniel W. Amidon      Daniel W. Amidon           | General Counsel, Corporate Secretary                                          | August 31, 2010 |
|   |                                                                               |                                                                          |            |
|   | /s/ Jeffrey C. Swoveland      Jeffrey C. Swoveland   | Director                                                                      | August 31, 2010 |
|   |                                                                               |                                                                          |            |
|   | /s/ Kimberly Luff Wakim      Kimberly Luff Wakim     | Director                                                                      | August 31, 2010 |
|   |                                                                               |                                                                          |            |
|   | /s/ David C. Parke      David C. Parke               | Director                                                                      | August 31, 2010 |
|   |                                                                               |                                                                          |            |
|   | /s/ Anthony J. Crisafio      Anthony J. Crisafio     | Director                                                                      | August 31, 2010 |
|   |                                                                               |                                                                          |            |
|   | /s/ Joseph E. Casabona      Joseph E. Casabona       | Director                                                                      | August 31, 2010 |
|   |                                                                               |                                                                          |            |
|   | /s/ Larry F. Mazza      Larry F. Mazza          | Director                                                                      | August 31, 2010 |
|   | /s/ James M. Trimble      James M. Trimble      | Director                                                                      | August 31, 2010 |

----

|    |                                                           |                                                                     |   | Incorporated by Reference |         |     |
|---------|----------------------------------------------------------------|--------------------------------------------------------------------------|--------|---------------------------|--------------|----------|
| Exhibit |                                                           |                                                                     |   |                      |         | SEC File |   |   |   |   |   | Filed |
| Number  |                                                      | Exhibit Description                                                      |   | Form                      |    | Number   |    | Exhibit |   | Filing Date |    | Herewith |
|    |                                                           |                                                                     |   |                      |         |     |   |   |   |   |   |   |
| 23.2    |                                                           | Consent of Wright & Company, Inc., Petroleum Consultants.            |   |                      |         |     |   |   |   |   |   | X |
|    |                                                           |                                                                     |   |                      |         |     |   |   |   |   |   |   |
| 23.3    |                                                           | Consent of Ryder Scott Company, L.P., Petroleum Consultants.             |   |                      |         |     |   |   |   |   |   | X |
|    |                                                           |                                                                     |   |                      |         |     |   |   |   |   |   |   |
| 31.1    | Certification by Chief Executive Officer pursuant to Rule 13a- |                                                                     | X      |
|    |                                                           | 14(a) and 15d-14(a) of the Exchange Act Rules, as adopted                |   |                      |         |     |   |   |   |   |   |   |
|    |                                                           | pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.               |   |                      |         |     |   |   |   |   |   |   |
|    |                                                           |                                                                     |   |                      |         |     |   |   |   |   |   |   |
| 31.2    |                                                           | Certification by Chief Financial Officer pursuant to Rule 13a-      |   |                      |         |     |   |   |   |   |   | X |
|    |                                                           | 14(a) and 15d-14(a) of the Exchange Act Rules, as adopted                |   |                      |         |     |   |   |   |   |   |   |
|    |                                                           | pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.               |   |                      |         |     |   |   |   |   |   |   |
|    |                                                           |                                                                     |   |                      |         |     |   |   |   |   |   |   |
| 99.1    |                                                           | Report of Independent Petroleum Consultants - Ryder Scott Company, L.P.  |   |                      |         |     |   |   |   |   |   | X |
|    |                                                           |                                                                     |   |                      |         |     |   |   |   |   |   |   |
| 99.2    |                                                           | Report of Independent Petroleum Consultants - Wright & Company, Inc. |   |                      |         |     |   |   |   |   |   | X |
|    |                                                           |                                                                     |   |                      |         |     |   |   |   |   |   |   |
|    |                                                           |                                                                     |   |                      |         |     |   |   |   |   |   |   |