Penfield is a town in Monroe County, New York, United States. The population was 36,242 at the 2010 census.The town was incorporated in 1810 by the proprietor, Daniel Penfield, who purchased the town lands in 1795 and moved to the area in 1809. His house still stands at 1784 Penfield Road. Penfield is a suburb of Rochester, New York. The town's motto is "A Town of Planned Progress".