what county is arroyo grande ca
Arroyo Grande, CA. Sponsored Topics. Arroyo Grande is a city in San Luis Obispo County, California, United States. The population was 17,252 at the 2010 census. Arroyo Grande is a small coastal town with historic, suburban, and rural elements located at 35Â°7â²15â³N 120Â°35â²12â³W / 35.12083Â°N 120.58667Â°W / 35.12083; -120.58667 (35.120878, -120.586799).