Monmouth County is a county located in the U.S. state of New Jersey, within the New York metropolitan area. As of the 2000 Census, the population is 615,301. Its county seat is Freehold Borough6. Monmouth County ranks 42nd among the highest-income counties in the United States with a per capita income of $31,149. The most populous municipality is Middletown Township, with 66,327 residents at the time of the 2000 Census. It is the northernmost county on the Jersey Shore.

In recent years, thanks in large part to the county's position on the Jersey Shore and its location within commuting distance of New York City, the population and cost of living have been skyrocketing. In its 2006 ranking of the Most Expensive ZIP Codes in the United States, Monmouth County was represented by Deal (96), Allenhurst (131), Avon-by-the-Sea (138), Sea Girt (157), Rumson (309) and Colts Neck Township (316).