Penryn (Washo: Pénwin) is a census-designated place in Placer County, California, in the United States. Geographic location is 38°51′08″N 121°10′06″W. Penryn is located 5.5 miles (8.9 km) northeast of Rocklin. The community's ZIP code is 95663 and is in area codes 916 and 279. The population was 831 at the 2010 census.