http://en.wikipedia.org/wiki/List_of_highest-income_counties_in_the_United_StatesRank County
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State Median Household Income[3] Population[4]
1 Loudoun County Virginia $119,134 325,405
2 Fairfax County Virginia $105,797 1,100,692
3 Arlington County Virginia $100,735 216,004
4 Hunterdon County New Jersey $99,099 128,038
5 Howard County Maryland $98,953 293,142
6 Somerset County New Jersey $96,360 324,893
7 Prince William County Virginia $95,146 419,096
8 Fauquier County Virginia $93,762 66,320
9 Douglas County Colorado $93,573 292,167
10 Montgomery County Maryland $92,909 989,794
11 Charles County Maryland $91,733 149,130
12 Nassau County New York $91,414 1,344,436
13 Stafford County Virginia $91,348 132,133
14 Morris County New Jersey $91,332 494,976
15 Putnam County New York $90,735 99,933
16 Calvert County Maryland $89,393 89,256
17 Williamson County Tennessee $86,962 188,560
18 Delaware County Ohio $85,365 178,341
19 Santa Clara County California $84,895 1,809,378
20 York County Virginia $84,167 66,134