Moss is a coastal town and a municipality in Viken county, Norway. The administrative centre of the municipality is the town of Moss. The city of Moss was established as a municipality on 1 January 1838 (see formannskapsdistrikt). The rural municipality of Jeløy was merged with the city on 1 July 1943. The former municipality of Rygge was merged into it on January 1, 2020.