Porton is a village in the Bourne valley, Wiltshire, England, about 5 miles (8 km) northeast of Salisbury. It is the largest settlement in Idmiston civil parish.

Idmiston is a village and civil parish in Wiltshire, England. The village is about 3 miles (4.8 km) southeast of Amesbury and 6 miles (10 km) northeast of Salisbury. The parish includes the villages of Porton and Gomeldon; all three villages are on the River Bourne and are linked by the A338 road.