Plainville is the name of numerous places in the United States of America:
- Plainville, Connecticut
- Plainville, Georgia
- Plainville, Illinois
- Plainville, Indiana
- Plainville, Kansas
- Plainville, Massachusetts
- Plainville, New Jersey
- Plainville, New York
- Plainville, Ohio
- Plainville, Pennsylvania
- Plainville, Wisconsin
It is also the name of two communes in France:
- Plainville, Eure in the Eure département
- Plainville, Oise in the Oise département