Rochester is a village in Lorain County, Ohio, United States, along the West Branch of the Black River.

The village derives its name from Rochester, New York, the native home of a land agent.

The racial makeup of the village was 98.4% White, 0.5% Native American, and 1.1% from two or more races.

21.1% of all households were made up of individuals, and 7% had someone living alone who was 65 years of age or older.

16.2% of all households were made up of individuals, and 5.9% had someone living alone who was 65 years of age or older.

About 1.8% of families and 7.4% of the population were below the poverty line, including 11.1% of those under the age of eighteen and 15.4% of those 65 or over.