| County | Rank | 2010 | 2012 | Increase | Percent |
|---|---|---|---|---|---|
| Williams County, N.D. | 1 | 22,398 | 26,697 | 4,299 | 19.2% |
| St. Bernard Parish, La. | 2 | 35,897 | 41,635 | 5,738 | 16.0% |
| Chattahoochee County, Ga. | 3 | 11,267 | 13,037 | 1,770 | 15.7% |
| Fredericksburg, Va. | 4 | 24,286 | 27,307 | 3,021 | 12.4% |
| Long County, Ga. | 5 | 14,448 | 16,048 | 1,600 | 11.1% |
| Richland County, Mont. | 6 | 9,746 | 10,810 | 1,064 | 10.9% |
| Manassas Park, Va. | 7 | 14,273 | 15,798 | 1,525 | 10.7% |
| Stark County, N.D. | 8 | 24,199 | 26,771 | 2,572 | 10.6% |
| Geary County, Kan. | 9 | 34,362 | 38,013 | 3,651 | 10.6% |
| Franklin County, Wash. | 10 | 78,163 | 85,845 | 7,682 | 9.8% |