Romsey is a small market town in the county of Hampshire, England.It is 7 miles (11 km) northwest of Southampton, 11 miles (18 km) southwest of Winchester and 17 miles (27 km) Southeast of Salisbury. Neighbouring the village of North Baddesley, just over 18,000 people live in Romsey, which has an area of about 4.93 square kilometres.Romsey is one of the principal towns in the Test Valley Borough and lies on the River Test, which is known for fly fishing, predominantly trout.