Roman buildings and tesselated pavements close to the quayside have led to suggestions that a small Roman settlement and port existed on the site of the modern town, with a road linking it to the nearby town of Camulodunum (modern Colchester).

[3] Edward the Confessor granted the island to the abbey of St. Ouen in Rouen, France, in 1046, and the Priory of West Mersea was established.

West Mersea was recorded in the Domesday Book in 1086, at which time it had a population of 84 households.

[6] The town is served by a community centre,[7] various shops, restaurants, small hotels, public houses, a petrol station, bank, library, museum, and several churches, including the Norman St Peter and St Paul (Church of England), Roman Catholic, Methodist, and West Mersea Free Church, affiliated to the Baptist Union.

The North Sea at West Mersea is the inspiration for the memoir Footloose in France, beginning there at the seaside and ending at a fish restaurant on the harbour.