| County Name | State | Average Adjusted Gross Income | Rank* | |||||
| Fairfield County | Connecticut | $98,023 | 1 | |||||
| Teton County | Wyoming | $93,967 | 2 | |||||
| Somerset County | New Jersey | $92,829 | 3 | |||||
| Hunterdon County | New Jersey | $92,486 | 4 | |||||
| Morris County | New Jersey | $91,569 | 5 | |||||
| Marin County | California | $91,560 | 6 | |||||
| Westchester County | New York | $90,037 | 7 | |||||
| Douglas County | Colorado | $87,321 | 8 | |||||
| Los Alamos County | New Mexico | $84,334 | 9 | |||||
| Hamilton County | Indiana | $83,985 | 10 | |||||
| Lake County | Illinois | $83,931 | 11 | |||||
| Ozaukee County | Wisconsin | $83,874 | 12 | |||||
| Williamson County | Tennessee | $83,358 | 13 | |||||
| Loudoun County | Virginia | $83,043 | 14 | |||||
| Fairfax County | Virginia | $82,475 | 15 | |||||
| New York County | New York | $82,308 | 16 | |||||
| Carver County | Minnesota | $81,299 | 17 | |||||
| Chester County | Pennsylvania | $80,835 | 18 | |||||
| Falls Church City | Virginia | $80,269 | 19 | |||||
| Forsyth County | Georgia | $80,134 | 20 | |||||
| Storey County | Nevada | $79,974 | 21 | |||||
| Goochland County | Virginia | $79,973 | 22 | |||||
| San Mateo County | California | $79,636 | 23 | |||||
| Howard County | Maryland | $79,262 | 24 | |||||
| Bergen County | New Jersey | $78,768 | 25 | |||||
| Monmouth County | New Jersey | $78,652 | 26 | |||||
| Delaware County | Ohio | $77,997 | 27 | |||||
| Montgomery County | Maryland | $77,638 | 28 | |||||
| San Juan County | Washington | $76,927 | 29 | |||||
| Collin County | Texas | $75,875 | 30 | |||||
| Norfolk County | Massachusetts | $75,846 | 31 | |||||
| Nassau County | New York | $75,699 | 32 | |||||
| Santa Clara County | California | $75,141 | 33 | |||||
| Fayette County | Georgia | $74,931 | 34 | |||||
| Pitkin County | Colorado | $73,775 | 35 | |||||
| DuPage County | Illinois | $72,691 | 36 | |||||
| Johnson County | Kansas | $72,611 | 37 | |||||
| Collier County | Florida | $72,510 | 38 | |||||
| Waukesha County | Wisconsin | $72,497 | 39 | |||||
| Montgomery County | Pennsylvania | $72,459 | 40 | |||||
| Fauquier County | Virginia | $72,234 | 41 | |||||
| Middlesex County | Massachusetts | $71,618 | 42 | |||||
| Putnam County | New York | $71,377 | 43 | |||||
| Oakland County | Michigan | $71,301 | 44 | |||||
| Scott County | Minnesota | $71,077 | 45 | |||||
| Contra Costa County | California | $70,920 | 46 | |||||
| Washington County | Minnesota | $70,885 | 47 | |||||
| Summit County | Utah | $70,462 | 48 | |||||
| Mercer County | New Jersey | $69,900 | 49 | |||||
| Boone County | Indiana | $69,470 | 50 | |||||