Lincoln Acres is an unincorporated community of San Diego County located wholly within the boundaries of the incorporated city of National City. It has a population of approximately 2,100 residents, and residents may keep livestock. Lincoln Acres has a fire station and library. The community relies on the San Diego County Sheriff's Department to provide police protection. Sheriff Deputies from the Imperial Beach station police the neighborhood. Even though it has a post office, it shares its ZIP code, 91950, with National City. However the United States Postal Service lists the zip code 91947 as being located within Lincoln Acres for P.O. Box use. The community is in area code 619.