(Links below lead to Quick Facts for Vermont Counties: People, Business & Geography at U.S. Census Bureau.)
| Area | 7/1/2009 | 7/1/2008 | 7/1/2007 | 7/1/2006 | 7/1/2005 | 7/1/2004 | 7/1/2003 | 7/1/2002 | 7/1/2001 | 7/1/2000 | Census 2000 |
| Vermont | 621,760 | 621,049 | 620,460 | 619,985 | 618,814 | 618,145 | 616,559 | 614,950 | 612,153 | 609,903 | 608,827 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Addison County | 36,760 | 36,751 | 36,726 | 36,592 | 36,468 | 36,469 | 36,346 | 36,288 | 36,053 | 36,025 | 35,974 |
| Bennington County | 36,411 | 36,446 | 36,439 | 36,552 | 36,481 | 36,686 | 36,798 | 36,938 | 36,899 | 36,976 | 36,994 |
| Caledonia County | 30,252 | 30,256 | 30,426 | 30,543 | 30,302 | 30,200 | 29,869 | 29,872 | 29,650 | 29,728 | 29,702 |
| Chittenden County | 152,313 | 151,367 | 150,698 | 150,257 | 149,983 | 149,712 | 149,093 | 148,795 | 147,979 | 147,070 | 146,571 |
| Essex County | 6,394 | 6,459 | 6,465 | 6,379 | 6,483 | 6,507 | 6,504 | 6,525 | 6,483 | 6,456 | 6,459 |
| Franklin County | 48,182 | 47,985 | 47,909 | 47,743 | 47,487 | 47,194 | 46,785 | 46,472 | 46,012 | 45,581 | 45,417 |
| Grand Isle County | 7,560 | 7,676 | 7,548 | 7,515 | 7,576 | 7,506 | 7,387 | 7,244 | 7,103 | 6,939 | 6,901 |
| Lamoille County | 25,958 | 25,695 | 25,255 | 24,898 | 24,459 | 24,286 | 24,179 | 23,925 | 23,625 | 23,333 | 23,233 |
| Orange County | 28,896 | 28,936 | 29,000 | 29,113 | 28,938 | 28,928 | 28,814 | 28,653 | 28,619 | 28,307 | 28,226 |
| Orleans County | 27,301 | 27,265 | 27,335 | 27,207 | 27,217 | 27,065 | 26,911 | 26,561 | 26,463 | 26,335 | 26,277 |
| Rutland County | 63,014 | 63,214 | 63,312 | 63,484 | 63,508 | 63,419 | 63,440 | 63,246 | 63,294 | 63,423 | 63,400 |
| Washington County | 58,696 | 58,677 | 58,702 | 58,911 | 58,952 | 58,766 | 58,732 | 58,768 | 58,477 | 58,091 | 58,039 |
| Windham County | 43,471 | 43,559 | 43,699 | 43,745 | 43,663 | 43,845 | 44,071 | 43,985 | 43,975 | 44,156 | 44,216 |
| Windsor County | 56,552 | 56,763 | 56,946 | 57,046 | 57,297 | 57,562 | 57,630 | 57,678 | 57,521 | 57,483 | 57,418 |
Source: Population Division, U.S. Census Bureau