The resident population of U.S is 320,635,163 as of July 1, 2015.
| Resident | 320,635,163 |
| Resident Plus Armed Forces Overseas | 320,870,703 |
| Civilian | 319,438,649 |
| Noninstitutionalized Civilian | 315,510,861 |
| Household | 312,529,229 |
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 (38,918,045), and the least is Wyoming (585,613) as of July 1, 2015. The below table shows all states population in 2015 [1].
| State | Population |
| Alabama | 4,852,347 |
| Alaska | 737,498 |
| Arizona | 6,829,676 |
| Arkansas | 2,978,048 |
| California | 38,918,045 |
| Colorado | 5,450,623 |
| Connecticut | 3,587,122 |
| Delaware | 941,252 |
| District of Columbia | 675,400 |
| Florida | 20,209,042 |
| Georgia | 10,178,447 |
| Hawaii | 1,422,052 |
| Idaho | 1,651,059 |
| Illinois | 12,858,913 |
| Indiana | 6,608,422 |
| Iowa | 3,120,960 |
| Kansas | 2,909,011 |
| Kentucky | 4,425,976 |
| Louisiana | 4,664,628 |
| Maine | 1,328,262 |
| Maryland | 5,985,562 |
| Massachusetts | 6,794,228 |
| Michigan | 9,931,715 |
| Minnesota | 5,482,032 |
| Mississippi | 2,988,471 |
| Missouri | 6,071,732 |
| Montana | 1,030,475 |
| Nebraska | 1,891,277 |
| Nevada | 2,866,939 |
| New Hampshire | 1,336,350 |
| New Jersey | 8,867,949 |
| New Mexico | 2,089,291 |
| New York | 19,654,666 |
| North Carolina | 10,031,646 |
| North Dakota | 754,066 |
| Ohio | 11,617,527 |
| Oklahoma | 3,909,500 |
| Oregon | 4,015,792 |
| Pennsylvania | 12,784,826 |
| Rhode Island | 1,056,065 |
| South Carolina | 4,891,938 |
| South Dakota | 853,988 |
| Tennessee | 6,591,170 |
| Texas | 27,470,056 |
| Utah | 2,981,835 |
| Vermont | 625,216 |
| Virginia | 8,361,808 |
| Washington | 7,163,657 |
| West Virginia | 1,842,050 |
| Wisconsin | 5,760,940 |
| Wyoming | 585,613 |