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Monmouth County () is a county located in the U. S. state of New Jersey, within the New York metropolitan area.

As of the 2010 Census, the population was 630, 380, up from 615, 301 at the 2000 Census, making it the fifth-most populous county in the state.

Its county seat is Freehold Borough.

The most populous municipality is Middletown Township with 66, 522 residents at the time of the 2010 Census.