Oak Grove is an

unincorporated community An unincorporated area is a parcel of land that is not governed by a local general-purpose municipal corporation. (At p. 178.) They may be governed or serviced by an encompassing unit (such as a county) or another branch of the state (such as th ...

in St. Francois Township in Madison County,

Missouri Missouri (''see #Etymology and pronunciation, pronunciation'') is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it border ...

, United States. It is located on Route 72, approximately six miles west of Fredericktown. It received its name from its location in a grove of oak trees.

References

Unincorporated communities in Madison County, Missouri Unincorporated communities in Missouri {{MadisonCountyMO-geo-stub