City of Oceanside | 9,451 followers on LinkedIn. Our mission is to enhance quality of life through outstanding service to our beautifully diverse community. | Ideally situated halfway between L.A. and San Diego, Oceanside, with its gorgeous coastline and perfect weather is a superb place to live and work. The City of Oceanside is a full-service city. We provide our own police and fire safety, library, water and sewer services.