Moss Beach is a coastal census-designated place in San Mateo County, California, with a year 2020 census population of 3,214. Moss Beach’s undisturbed coastline feels worlds away. Here, you’ll find a vibrant marine reserve teeming with sea life, an historic eatery with killer views and a swashbuckling past, and a stylish, boutique inn plunked on a dramatic coastal bluff.