Hales Grove (formerly, Monroe and Monroeville) is an

unincorporated community An unincorporated area is a region that is not governed by a local municipal corporation. Widespread unincorporated communities and areas are a distinguishing feature of the United States and Canada. Most other countries of the world either have ...

in Mendocino County,

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

. It is located on

California State Route 1 State Route 1 (SR 1) is a major north–south state highway that runs along most of the Pacific coastline of the U.S. state of California. At , it is the longest state route in California, and the second-longest in the US after Monta ...

DeLorme ''California Atlas & Gazetteer'' (2008) Yarmouth, Maine p.47 adjacent to the South Fork of Mule Creek south of Piercy, at an elevation of 1138 feet (347 m). The Monroe post office opened in 1897, and after several moves closed in 1912.

References

Unincorporated communities in California Unincorporated communities in Mendocino County, California {{MendocinoCountyCA-geo-stub