Rockford is a village in Mercer County, Ohio, United States. The village is on the St. Mary's River near the center of the western Ohio border 12 miles Northwest of Celina. The population was 1,051 at the 2020 census.

U.S. Route 33 (US 33) is a United States Numbered Highway that runs northwest–southeast for 709 miles (1,141 km) from northern Indiana to Richmond, Virginia, passing through Ohio and West Virginia en route. Although most odd-numbered U.S. routes are north–south, US 33 is labeled east–west throughout its route, except in Indiana where it is labeled north–south. It roughly follows a historic trail used by Native Americans from Chesapeake Bay to Lake Michigan.