County highway
County Route 19 is a south–north arterial through central Suffolk County. The highway begins at an intersection with CR 65 in Patchogue. It connects several bedroom communities with major highways such as I-495 (the Long Island Expressway) and NY 27. CR 19 terminates at an intersection with CR 16 in Lake Ronkonkoma. The route was added to the Suffolk County highway system on January 27, 1930, and was amended on January 29, 1965.