List of bus routes in Suffolk County, New York

As part of this redesign, there is daily service system-wide with local buses running weekdays until 10 p.m. and to 8 or 9 p.m. on weekends.

Odd-numbered routes are generally oriented north to south, with even numbers west to east.

Timed connections between routes can be made at Long Island Rail Road stations in Amityville, Brentwood, Central Islip, Patchogue, and Riverhead, in Bay Shore and at the Smith Haven Mall.

[2] In early June 2024, SCT added a new route, the 56, running between Smithtown Railroad and Kings Park Manor.

The prefix denoted Suffolk County, akin to route labeling in other transit systems around the region.