Elkhorn is a census-designated place in Monterey County, California, United States. The population of Elkhorn was 1,591 at the 2000 census. Elkhorn was named after the elk in the area that have since gone extinct. Because Elkhorn is not a city, not all residents call the place they live Elkhorn. Some residents refer to Elkhorn as Castroville on mailed documents because Elkhorn shares a zip code with Castroville. Other residents refer to Elkhorn as north Monterey County of which Elkhorn is a part. Elkhorn apartments for rent comparison page shows most up to date rent information on Elkhorn apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.