Mongaup Valley is a hamlet (and census-designated place)[2] in Sullivan County, New York, United States.

The community is located along New York State Route 17B 5 miles (8.0 km) west of Monticello, and along the Mongaup River.

Mongaup Valley has a post office with ZIP code 12762, which opened on June 22, 1848.

[3][4] Media related to Mongaup Valley, New York at Wikimedia Commons

This article about a location in Sullivan County, New York is a stub.