TABLE 1—
Visits by State Population: HealthMap Vaccine Finder, United States, September 1, 2012–April 30, 2013
| Region | Visits | Population | Visits/10 000 population |
| 10 highest usage states | |||
| District of Columbia | 11 684 | 632 323 | 184.78 |
| New Jersey | 38 540 | 8 864 590 | 43.48 |
| Connecticut | 13 120 | 3 590 347 | 36.54 |
| Washington | 23 560 | 6 897 012 | 34.16 |
| Massachusetts | 22 592 | 6 646 144 | 33.99 |
| New York | 61 393 | 19 570 261 | 31.37 |
| Oregon | 12 098 | 3 899 353 | 31.03 |
| Maryland | 17 517 | 5 884 563 | 29.77 |
| New Hampshire | 3 839 | 1 320 718 | 29.07 |
| Vermont | 1 799 | 626 011 | 28.74 |
| 10 lowest usage states | |||
| Alaska | 778 | 731 499 | 10.63 |
| Arkansas | 3 098 | 2 949 131 | 10.50 |
| West Virginia | 1 516 | 1 855 413 | 8.17 |
| Tennessee | 5 153 | 6 456 243 | 7.98 |
| Wyoming | 457 | 576 412 | 7.93 |
| Kentucky | 3 285 | 4 380 415 | 7.50 |
| Montana | 683 | 1 005 141 | 6.80 |
| Louisiana | 3 111 | 4 601 893 | 6.76 |
| Alabama | 2 480 | 4 822 023 | 5.14 |
| Mississippi | 1 344 | 2 984 926 | 4.50 |