County Borough of Southend-on-Sea County Borough of Southend-on-Sea Southend-on-Sea was a local government district from 1866 to 1974 around the seaside resort of Southend-on-Sea in Essex, England. Southend adopted the Local Government Act 1858 and a local board was established in 1866. It became an urban sanitary district in 1875. It was incorporated as a municipal borough in 1892. The name was changed from Southend to Southend-on-Sea in 1893. It gained the status of county borough in 1914. The local government district originally consisted of the South End of the parish of Prittlewell. This became a separate parish of St John the Baptist for
Rhos-on-Sea between Llandudno and Rhos-on-Sea from 1907 and extended to Colwyn Bay in 1908. The service closed in 1956. The community boundaries are coterminous with the electoral ward of Llandrillo-yn-Rhos, which elects four county councillors to Conwy County Borough Council. Rhos-on-Sea is also divided into two community wards, of Rhos and Dinarth. Rhos elects up to five councillors and Dinarth elects up to three councillors to the Bay of Colwyn Town Council (which was formed in 1996). Rhos-on-Sea Rhos-on-Sea (), also known as "Rhos" or "Llandrillo", is a seaside resort and community in Conwy County Borough, Wales. The population was 7,110