2012 Congressional Primary Dates and Filing Deadlines
Note: Due to redistricting all dates are subject to change
| State | Primary | Filing Deadline |
| Alabama | March 13 (runoff April 24) | January 13 |
| Alaska | August 28 | June 1 |
| Arizona | August 28 | May 30 |
| Arkansas | May 22 (runoff June 12) | March 1 |
| California | June 5 | March 9 |
| Colorado | June 26 | April 2 |
| Connecticut | August 14 | June 12 |
| Delaware | September 11 | July 10 |
| Florida | August 14 | June 8 |
| Georgia | July 31 (August 21) | May 25 |
| Hawaii | August 11 | June 5 |
| Idaho | May 15 | March 9 |
| Illinois | March 20 | December 27, 2011 |
| Indiana | May 8 | February 10 |
| Iowa | June 5 | March 16 |
| Kansas | August 7 | June 11 |
| Kentucky | May 22 | January 31 |
| Louisiana | November 6 open primary (runoff December 1) | August 17 |
| Maine | June 12 | March 15 |
| Maryland | April 3 | January 11 |
| Massachusetts | September 6 | June 5 |
| Michigan | August 7 | May 15 |
| Minnesota | August 14 | June 5 |
| Mississippi | March 13 (runoff April 3) | January 13 |
| Missouri | August 7 | March 27 |
| Montana | June 5 | March 12 |
| Nebraska | May 15 | February 15 incumbents, March 1 for non-incumbents |
| Nevada | June 12 | March 16 |
| New Hampshire | September 11 | June 15 |
| New Jersey | June 5 | April 2 |
| New Mexico | June 5 | February 14 |
| New York | June 26 | April 16 |
| North Carolina | May 8 (runoff June 26) | February 29 |
| North Dakota | June 12 | April 13 |
| Ohio | March 6 | December 30, 2011 |
| Oklahoma | June 26 (runoff August 28) | April 13 |
| Oregon | May 15 | March 6 |
| Pennsylvania | April 24 | February 14 |
| Rhode Island | September 11 | June 27 |
| South Carolina | June 12 (runoff June 26) | March 30 |
| South Dakota | June 5 | March 27 |
| Tennessee | August 2 | April 5 |
| Texas | May 29 (runoff July 31) | March 9 |
| Utah | June 26 | March 15 |
| Vermont | August 28 | June 14 |
| Virginia | June 12 | March 29 |
| Washington | August 7 | May 18 |
| West Virginia | May 8 | January 28 |
| Wisconsin | August 14 | June 1 |
| Wyoming | August 21 | June 1 |
