County Route 521 (New Jersey)

County Route 521
CR 521 highlighted in red
Route information
Length	43.71 mi[1] (70.34 km)
Major junctions
South end	CR 519 / CR 609 in Hope Township
Major intersections	I-80 in Hope Township Route 94 in Blairstown Township US 206 in Frankford Township
North end	CR 16 at New York state line in Montague Township
Location
Country	United States
State	New Jersey
Counties	Warren, Sussex
Highway system
County routes in New Jersey 500-series routes
← CR 520 → CR 522

County Route 521 (CR 521) is a county highway in the U.S. state of New Jersey. The highway extends 43.71 miles (70.34 kilometers) from High Street (CR 519) in Hope Township to the New York state line in Montague Township.

CR 521 follows portions of the Military Road, a roadway built during the French and Indian War connecting Elizabethtown, New Jersey (now Elizabeth) with a string of fortifications constructed along the Delaware River in modern Sussex and Warren Counties in northwestern New Jersey.