The following table details U.S. median household income by county from the 2005-2009 American Community Survey from the U.S. Census Bureau. Counties where the margin of error exceeded $2,000 have been excluded.
============================================================================= 2005-2009 Census 2000 County Name ACS Income Income Change ============================================================================= Loudoun County, Virginia $112,021 $103,817 $8,204 Fairfax County, Virginia $104,259 $104,335 -$76 Howard County, Maryland $101,003 $95,474 $5,529 Douglas County, Colorado $99,522 $106,754 -$7,232 Morris County, New Jersey $96,316 $99,559 -$3,243 Somerset County, New Jersey $96,233 $99,035 -$2,802 Arlington County, Virginia $93,806 $81,101 $12,705 Nassau County, New York $92,450 $92,724 -$274 Montgomery County, Maryland $92,213 $92,107 $106 Stafford County, Virginia $90,586 $86,003 $4,583