Frinton-on-Sea is a seaside town and a former civil parish, now in the parish of Frinton and Walton, in the Tendring district of Essex, Engla…Frinton-on-Sea is a seaside town and a former civil parish, now in the parish of Frinton and Walton, in the Tendring district of Essex, England. In 2018 it had an estimated population of 4,837.