Route 147 is a 4.23-mile-long (6.81 km) east–west state highway in Massachusetts, serving the cities of Agawam and West Springfield. Its western terminus is at Mill Street and Springfield Street in Agawam, and its eastern terminus is at U.S. Route 5 (US 5) in West Springfield. It follows the easternmost few miles of the former route of Route 57 before it was moved onto a limited access freeway a mile south, the Henry E. Bodurtha Highway, completed in 1966.
Route 147 begins at the intersection of Springfield Street and Mill Street in Agawam, where Springfield Street bears northeast and Mill Street begins east. The route continues northeast for two miles (3 km) then turns east at the intersection with North Street. Route 147 follows Springfield Street to an intersection with Route 75/Suffield Street and Route 159/Main Street. Route 75 and Route 159 both are continuations of Connecticut routes having the same number that enter Massachusetts four miles (6 km) to the south. At the intersection, Route 147 takes a left turn onto the Anne Sullivan bridge over the Westfield River and enters West Springfield.