Penryn is a census-designated place in Placer County, California, in the United States. Geographic location is 38°51′08″N 121°10′06″W / 38.85222°N 121.16833°W / 38.85222; -121.16833. Penryn is located 5.5 miles northeast of Rocklin. The community's ZIP code is 95663 and the area code 916. The population was 831 at the 2010 census.