| In October 2006, the United States Census Bureau | | | | 8. Marin County - $99,713 (California) |
| released data about the median family income of | | | | 9. Douglas County - $99,531 (Colorado) |
| families in all counties within the United States and | | | | 10. Montgomery County - $98,662 (Maryland) |
| Puerto Rico. The data was released in the Bureaus | | | | 11. Williamson County - $95,470 (Tennessee) |
| Annual Community Survey (ACS) report. The median | | | | 12. Calvert County - $93,842 (Maryland) |
| family income (in 2005 Inflation-Adjusted Dollars) | | | | 13. Monmouth County - $92,080 (New Jersey) |
| represents the mid-point of family income for a | | | | 14. Nassau County - $91,349 (New York) |
| county, where half of the families are above the | | | | 15. Rockland County - $90,947 (New York) |
| median value, and half of the families are below the | | | | As noted above, Virginia occupied the top 3 slots on |
| median value. The median value measurement is | | | | this list. New Jersey had 4 counties within the top 15. |
| sometimes a better indicator than average value | | | | Maryland had three counties in the top 15. New York |
| because it is less susceptible to unusually high or low | | | | had 2 counties in the top 15. Surprisingly, California |
| values. | | | | only had 1 county in the top 15, which was Marin |
| Listed below are the top 15 counties with the highest | | | | County located just north of San Francisco. The |
| median family income, followed by the median value | | | | median family income for United States as a whole |
| dollar amount, and the State. | | | | was $58,832. |
| 1. Loudoun County - $110,910 (Virginia) | | | | If you are interested in buying a home, condo or |
| 2. Fairfax County - $110,107 (Virginia) | | | | townhouse or any other type of real estate, you |
| 3. Arlington County - $106,218 (Virginia) | | | | should know that the median family income of a |
| 4. Hunterdon County - $106,167 (New Jersey) | | | | region is sometimes used by lenders to determine if |
| 5. Somerset County - $105,872 (New Jersey) | | | | a family is eligible for special low-income loan |
| 6. Howard County - $103,390 (Maryland) | | | | programs. |
| 7. Morris County - $100,971 (New Jersey) | | | | |