| County Name | State | Average Adjusted Gross Income | Rank* | |||||
| Teton County | Wyoming | $107,694 | 1 | |||||
| Fairfield County | Connecticut | $105,289 | 2 | |||||
| Marin County | California | $100,358 | 3 | |||||
| Somerset County | New Jersey | $96,307 | 4 | |||||
| Morris County | New Jersey | $95,185 | 5 | |||||
| Clear Creek County** | Colorado | $95,002 | 6 | |||||
| Douglas County | Colorado | $94,862 | 7 | |||||
| Hunterdon County | New Jersey | $94,478 | 8 | |||||
| Westchester County | New York | $94,275 | 9 | |||||
| New York County | New York | $91,179 | 10 | |||||
| San Mateo County | California | $89,233 | 11 | |||||
| Forsyth County | Georgia | $87,654 | 12 | |||||
| Hamilton County | Indiana | $87,317 | 13 | |||||
| Lake County | Illinois | $87,290 | 14 | |||||
| Santa Clara County | California | $86,587 | 15 | |||||
| Loudoun County | Virginia | $86,419 | 16 | |||||
| Chester County | Pennsylvania | $84,402 | 17 | |||||
| Ozaukee County | Wisconsin | $84,131 | 18 | |||||
| Goochland County | Virginia | $84,071 | 19 | |||||
| Carver County | Minnesota | $83,960 | 20 | |||||
| Fairfax County | Virginia | $83,694 | 21 | |||||
| Williamson County | Tennessee | $83,470 | 22 | |||||
| Pitkin County | Colorado | $82,574 | 23 | |||||
| Los Alamos County | New Mexico | $82,392 | 24 | |||||
| Falls Church City | Virginia | $82,014 | 25 | |||||
| Bergen County | New Jersey | $81,494 | 26 | |||||
| Collin County | Texas | $81,256 | 27 | |||||
| Norfolk County | Massachusetts | $80,722 | 28 | |||||
| Monmouth County | New Jersey | $80,391 | 29 | |||||
| Delaware County | Ohio | $80,115 | 30 | |||||
| Storey County | Nevada | $80,113 | 31 | |||||
| Montgomery County | Maryland | $79,673 | 32 | |||||
| Howard County | Maryland | $79,356 | 33 | |||||
| Nassau County | New York | $77,471 | 34 | |||||
| Middlesex County | Massachusetts | $76,815 | 35 | |||||
| Fayette County | Georgia | $76,004 | 36 | |||||
| Summit County | Utah | $75,721 | 37 | |||||
| Collier County | Florida | $75,511 | 38 | |||||
| DuPage County | Illinois | $74,744 | 39 | |||||
| Montgomery County | Pennsylvania | $74,460 | 40 | |||||
| Johnson County | Kansas | $74,321 | 41 | |||||
| Oakland County | Michigan | $73,796 | 42 | |||||
| Contra Costa County | California | $73,605 | 43 | |||||
| Rockwall County | Texas | $72,892 | 44 | |||||
| Waukesha County | Wisconsin | $72,684 | 45 | |||||
| Putnam County | New York | $72,379 | 46 | |||||
| Washington County | Minnesota | $72,068 | 47 | |||||
| Boone County | Indiana | $71,735 | 48 | |||||
| Nantucket County | Massachusetts | $71,559 | 49 | |||||
| Mercer County | New Jersey | $71,547 | 50 | |||||