Hunterdon County is a county located in the U.S. state of New Jersey. As of the 2000 Census, the population is 121,989. It is part of the New York Metropolitan Area. Its county seat is Flemington6.

Hunterdon County ranks as the 13th among the highest-income counties in the United States with a per capita income of $36,370. It ranks third among U.S. counties for household income according to the most recent U.S. Census. Hunterdon County's median household income was $93,342, behind only Fairfax and Loudon Counties in Virginia. As of 2005, Hunterdon had the third-highest median property tax of any county in the nation at $6,988, the highest in New Jersey.