<P> Many of the top counties in the following lists are found in the Northeast Megalopolis, particularly in the Washington metropolitan area and the New York metropolitan area . </P> <P> Presented below are the 25 highest - income counties (with populations of 65,000 or greater) in the United States by median household income according to the 2016 American Community Survey prepared by the US Census Bureau . Five of the counties are located in the state of Maryland, five are in Virginia, four in California, three in New Jersey, two in New York, and one each in: Colorado, Georgia, Massachusetts, Ohio, Tennessee, and Texas . </P> <Table> <Tr> <Th> Rank </Th> <Th> County </Th> <Th> State </Th> <Th> Median Household Income </Th> </Tr> <Tr> <Td> </Td> <Td> Loudoun County </Td> <Td> Virginia </Td> <Td> $134,464 </Td> </Tr> <Tr> <Td> </Td> <Td> Howard County </Td> <Td> Maryland </Td> <Td> $120,941 </Td> </Tr> <Tr> <Td> </Td> <Td> Fairfax County </Td> <Td> Virginia </Td> <Td> $115,717 </Td> </Tr> <Tr> <Td> </Td> <Td> Hunterdon County </Td> <Td> New Jersey </Td> <Td> $113,684 </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Santa Clara County </Td> <Td> California </Td> <Td> $111,069 </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Arlington County </Td> <Td> Virginia </Td> <Td> $110,388 </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Douglas County </Td> <Td> Colorado </Td> <Td> $109,292 </Td> </Tr> <Tr> <Td> 8 </Td> <Td> San Mateo County </Td> <Td> California </Td> <Td> $108,627 </Td> </Tr> <Tr> <Td> 9 </Td> <Td> Morris County </Td> <Td> New Jersey </Td> <Td> $106,985 </Td> </Tr> <Tr> <Td> 10 </Td> <Td> Williamson County </Td> <Td> Tennessee </Td> <Td> $106,054 </Td> </Tr> <Tr> <Td> 11 </Td> <Td> Nassau County </Td> <Td> New York </Td> <Td> $105,870 </Td> </Tr> <Tr> <Td> 12 </Td> <Td> Somerset County </Td> <Td> New Jersey </Td> <Td> $104,478 </Td> </Tr> <Tr> <Td> 13 </Td> <Td> Marin County </Td> <Td> California </Td> <Td> $103,845 </Td> </Tr> <Tr> <Td> 14 </Td> <Td> San Francisco County </Td> <Td> California </Td> <Td> $103,801 </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Delaware County </Td> <Td> Ohio </Td> <Td> $101,693 </Td> </Tr> <Tr> <Td> 16 </Td> <Td> Forsyth County </Td> <Td> Georgia </Td> <Td> $100,909 </Td> </Tr> <Tr> <Td> 17 </Td> <Td> Montgomery County </Td> <Td> Maryland </Td> <Td> $99,763 </Td> </Tr> <Tr> <Td> 18 </Td> <Td> Calvert County </Td> <Td> Maryland </Td> <Td> $98,732 </Td> </Tr> <Tr> <Td> 19 </Td> <Td> Prince William County </Td> <Td> Virginia </Td> <Td> $97,986 </Td> </Tr> <Tr> <Td> 20 </Td> <Td> Stafford County </Td> <Td> Virginia </Td> <Td> $97,484 </Td> </Tr> <Tr> <Td> 21 </Td> <Td> Putnam County </Td> <Td> New York </Td> <Td> $96,992 </Td> </Tr> <Tr> <Td> 22 </Td> <Td> Anne Arundel County </Td> <Td> Maryland </Td> <Td> $96,483 </Td> </Tr> <Tr> <Td> 23 </Td> <Td> Charles County </Td> <Td> Maryland </Td> <Td> $95,735 </Td> </Tr> <Tr> <Td> 24 </Td> <Td> Rockwall County </Td> <Td> Texas </Td> <Td> $95,731 </Td> </Tr> <Tr> <Td> 25 </Td> <Td> Middlesex County </Td> <Td> Massachusetts </Td> <Td> $95,249 </Td> </Tr> </Table> <Tr> <Th> Rank </Th> <Th> County </Th> <Th> State </Th> <Th> Median Household Income </Th> </Tr>

What is the average income in marin county