County Route 509 (New Jersey)

County Route 509
County Route 509
	CR 509 highlighted in red (disconnected stub in Middlesex County is unsigned)
Route information
Existed	January 1, 1953–present
Southern segment
Length	0.95 mi (1,530 m)
South end	CR 531 / CR 602 in South Plainfield
North end	Raritan Road at the Edison–Scotch Plains line
Main segment
Length	25.78 mi (41.49 km)
South end	Route 28 in Westfield
Major intersections	G.S. Parkway in Kenilworth; Route 82 in Union Township; G.S. Parkway in Bloomfield; Route 3 / CR 602 in Clifton; US 46 / Route 21 in Clifton; I-80 in Paterson;
North end	CR 504 in Paterson
Location
Country	United States
State	New Jersey
Counties	Middlesex, Union, Essex, Passaic
Highway system
	County routes in New Jersey; 500-series routes;

County Route 509 (CR 509) is a county highway in the U.S. state of New Jersey. The highway exists in two segments– one 0.95-mile (1.53 km) unsigned segment exists in northern Middlesex County while the signed mainline extends 25.78 miles (41.49 km) from North Avenue (Route 28) in Westfield to Straight Street (CR 504) in Paterson.

For two small stretches – in Clifton at the interchange with Route 19, and in Paterson as it crosses over the Passaic River – CR 509 splits into separate northbound and southbound alignments.

CR 509 intersects with the Garden State Parkway at Exit 138 in Kenilworth and again at Exit 148 in Bloomfield.