County Route 527 (CR 527) is a county highway in the U.S. state of New Jersey. The highway extends from Main Street (Route 166 and CR 549) in Toms River Township to Pompton Avenue (Route 23) in Cedar Grove. It passes through more counties (six) than any other county route in New Jersey. CR 527 is also the second longest 500-series county route in New Jersey after Route 519. The county route traverses through the northernmost stretches of the Pine Barrens, much of the Raritan Valley and Rahway Valley regions (the route provides access to Monmouth Battlefield State Park, Rutgers University–New Brunswick, Delaware and Raritan Canal State Park, Watchung Reservation, and South Mountain Reservation), and the First and Second Watchung Mountains. It passes through Ocean, Monmouth, Middlesex, Somerset, Union, and Essex counties on the eastern side of the state. It has a 2.48 mile concurrency with Route 18 in Middlesex County in addition to other minor state highways and county roads. The route interchanges with the Garden State Parkway and Interstates 195, 95 (New Jersey Turnpike), 287, 78, and 280. It was first given the number 527 in 1954. Route description CR 527 begins at a traffic light with New Jersey Route 166 in Toms River. Passing some local roads at the beginning, CR 527 crosses an interchange with the Garden State Parkway at .53 of a mile (). More than a mile later, New Jersey Route 37 crosses 527 at a traffic light. Continuing through Toms River Township, CR 571 merges into 527 for about 3/4 of a mile. At , State Route 70 crosses CR 527. Just past ten miles (16 km), CR 547 crosses in Jackson Township. Further in Jackson Township, CR 527 joins CR 528 for a concurrency. At the end of the concurrency, CR 527 continues straight while CR 528 leaves to the left and CR 626 (Bennetts Mills Road) leaves to the right. At , CR 526 and CR 527 intersect. Less than a mile later, Interstate 195 interchanges with CR 527. Past this interchange, the route passes east of the Jackson Township Park & Ride, a park and ride facility serving Academy Bus Lines. At , CR 527 leaves Ocean County and enters Monmouth County. In Smithburg (the Freehold / Millstone / Manalapan township border), County Routes 524 and 537 cross. Past at Carrs Corner, CR 527 turns to the right heading northeast