The resident population of U.S is 311,556,874 as of July 1, 2011.
| Resident | 311,556,874 |
| Resident Plus Armed Forces Overseas | 311,973,914 |
| Civilian | 310,339,224 |
| Noninstitutionalized Civilian | 306,340,687 |
| Household | 303,494,581 |
All the data are sourced from US Census Bureau [48]. The definition of Civilian noninstitutional population: US Department of Labor.
The most populated state is California (37,638,369), and the least is Wyoming (567,299) as of July 1, 2011. The below table shows all states population in 2011 [1].
| State | Population |
| Alabama | 4,799,069 |
| Alaska | 722,128 |
| Arizona | 6,472,643 |
| Arkansas | 2,940,667 |
| California | 37,638,369 |
| Colorado | 5,121,108 |
| Connecticut | 3,588,283 |
| Delaware | 907,381 |
| District of Columbia | 619,800 |
| Florida | 19,053,237 |
| Georgia | 9,802,431 |
| Hawaii | 1,379,329 |
| Idaho | 1,583,910 |
| Illinois | 12,867,454 |
| Indiana | 6,516,528 |
| Iowa | 3,066,336 |
| Kansas | 2,869,225 |
| Kentucky | 4,369,821 |
| Louisiana | 4,575,625 |
| Maine | 1,328,284 |
| Maryland | 5,839,419 |
| Massachusetts | 6,613,583 |
| Michigan | 9,882,412 |
| Minnesota | 5,346,143 |
| Mississippi | 2,978,731 |
| Missouri | 6,010,275 |
| Montana | 997,316 |
| Nebraska | 1,840,672 |
| Nevada | 2,712,730 |
| New Hampshire | 1,320,202 |
| New Jersey | 8,828,117 |
| New Mexico | 2,080,450 |
| New York | 19,499,241 |
| North Carolina | 9,657,592 |
| North Dakota | 685,225 |
| Ohio | 11,544,663 |
| Oklahoma | 3,788,379 |
| Oregon | 3,872,036 |
| Pennsylvania | 12,745,815 |
| Rhode Island | 1,053,649 |
| South Carolina | 4,671,994 |
| South Dakota | 823,579 |
| Tennessee | 6,399,291 |
| Texas | 25,645,629 |
| Utah | 2,814,384 |
| Vermont | 627,049 |
| Virginia | 8,101,155 |
| Washington | 6,826,627 |
| West Virginia | 1,856,301 |
| Wisconsin | 5,705,288 |
| Wyoming | 567,299 |