It is a 2.8-mile-long (4.5 km) connection between the city of Saco and Old Orchard Beach between U.S. Route 1 (US 1) and SR 5.

SR 98 is signed as an east–west highway although its orientation is more northwest-to-southeast.

It proceeds southeast into Old Orchard Beach, passing by the Dunegrass Golf Club before meeting its eastern terminus at SR 5 just short of SR 5's southern terminus at SR 9 on the coastline.

SR 98 does not intersect any numbered routes between its endpoints.

[2] The route between Saco and Old Orchard Beach was originally designated as SR 6 in 1937.