Townline Road is an east/west route running along the border betweens the towns of Smithtown and Islip. It begins at Smithtown Bypass (NY 347) in Hauppauge, just east of where it splits off from Veterans Memorial Highway (NY 454). After a short distance, it merges with NY 111. The two routes split after one block, and Townline Road continues east along the town line to Nesconset. It ends at Nichols Road, an unnumbered town road, a couple of blocks south of Smithtown Boulevard (CR 16). The entire length is a two-lane undivided road.
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