The following is a list of county routes in Union County in the U.S. state of New Jersey. For more information on the county route system in New Jersey as a whole, including its history, see County routes in New Jersey.
In addition to those listed below, the following 500-series county routes serve Union County:[1]
| Route | Length (mi)[2] | Length (km) | From | Via | To | Notes |
|---|---|---|---|---|---|---|
| 4.51miles | CR 601 at the Middlesex County line in Plainfield | West 7th Street, East 7th Street, La Grande Avenue, Laurel Place | Route 28 in Fanwood | |||
| 0.79miles | CR 602 at the Middlesex County line in Colonia | Inman Avenue, West Inman Avenue | ||||
| 0.93miles | CR 603 at the Middlesex County line in Plainfield | Plainfield Avenue | Route 28 in Plainfield | |||
| 1.72miles | CR 607 in Clark | Madison Hill Road | CR 613 in Rahway | |||
| 0.2miles | CR 509 in Westfield | Nomahegan Drive | Dead end in Westfield | |||
| 2.4miles | CR 610 in Westfield | Lamberts Mill Road, Rahway Avenue, Westfield Avenue | County Route 613 in Clark | |||
| 4.9miles | Middlesex County line in Clark | Oak Ridge Road, Raritan Road | CR 612 in Roselle | |||
| 1.4miles | CR 613 in Clark | Valley Road | CR 615 in Linden | |||
| 0.86miles | Route 35 in Rahway | New Brunswick Avenue | CR 621 in Rahway | |||
| 9.86miles | CR 611 in Fanwood | East 3rd Street, Midway Avenue, North Avenue, South Avenue, West 1st Avenue, East 1st Avenue, West Grand Street, East Grand Street | Route 27 in Elizabeth | |||
| 4miles | County Route 606 in Scotch Plains | Raritan Road, Terrill Road | US Route 22 at the Somerset County line in Scotch Plains | |||
| 3.06miles | CR 617 in Roselle | West 3rd Avenue, Jersey Avenue, West Jersey Street | Route 27 in Elizabeth | |||
| 9.53miles | US 22 in Mountainside | Mountain Avenue, Broad Street, Central Avenue, Brant Avenue, Westfield Avenue, West Grand Avenue, East Grand Avenue | US 1/9 in Rahway | |||
| 0.92miles | Route 27 in Elizabeth | Pearl Street | US 1-9 in Elizabeth | |||
| 5.55miles | US 1-9 in Linden | South Stiles Street, North Stiles Street, Centennial Avenue, North Avenue East, Springfield Avenue | CR 509 in Cranford | |||
| 2miles | Rosewood Avenue in Roselle | Linden Road, Westfield Avenue, Galloping Hill Road | CR 509 in Union | Route 28 in Roselle Park | ||
| 5.7miles | US 1-9 in Linden | Wood Avenue, North Wood Avenue, South Wood Avenue, Amsterdam Avenue, 1st Avenue, Gordon Street, Westfield Avenue, Faitoute Avenue, Michigan Avenue | US 22 in Kenilworth | |||
| 2.7miles | CR 627 in Roselle Park | Magie Avenue, Orchard Street | CR 629 in Elizabeth | |||
| 6.38miles | CR 514 in Linden | Roselle Street, Chestnut Street, East 9th Avenue, Locust Street, Tucker Avenue, Chestnut Street, Stuyvesant Avenue | CR 619 at Essex County line in Union | |||
| 3.14miles | Route 28 in Plainfield | West Front Street, East Front Street, Front Street | CR 655 in Scotch Plains | |||
| 1.75miles | Route 27 in Rahway | West Hazelwood Avenue, East Hazelwood Avenue, Hart Street | Middlesex County line in Rahway | |||
| 6.6miles | CR 622 at the Somerset County line in Berkeley Heights | Mountain Avenue, Ashland Road, Mountain Avenue | CR 651 in Summit | |||
| 3.86miles | Route 439 in Elizabeth | Broad Street, North Broad Street | Essex County line in Hillside | |||
| 0.6miles | CR 641 in Berkeley Heights | Horseshoe Road | CR 622 in Berkeley Heights | |||
| 0.69miles | CR 619 in Roselle | Chestnut Street | CR 610 in Roselle | |||
| 0.91miles | US 22 in Union | West Chestnut Street | CR 619 in Union | |||
| 1.08miles | Route 28 in Roselle Park | Chestnut Street | CR 509 in Union | |||
| 0.73miles | CR 509 in Hillside | Hillside Avenue | CR 623 in Hillside | |||
| 0.74miles | Route 27 in Elizabeth | Morris Avenue | Route 439 in Union | |||
| 5.1miles | CR 630 Alt. at the Essex County line in Union | Vauxhall Road, Salem Road, Conant Street | Salem Avenue in Hillside | |||
| 0.88miles | CR 509 in Hillside | Bloy Street, Hillside Avenue | CR 509 in Hillside | Decommissioned | ||
| 2miles | CR 608 in Clark | Walnut Avenue | CR 610 in Cranford | |||
| 1.6miles | Route 82 in Union | Burnet Avenue | Essex County line in Union | |||
| 2.07miles | US 22 in Scotch Plains | Willow Avenue, Mountain Avenue | US 22 in Westfield | |||
| 2.26miles | US 22 in Mountainside | Mountain Avenue | Route 124 in Springfield | |||
| 1.6miles | CR 527 in Summit | Orchard Street, Shunpike Road | CR 639 in Springfield | |||
| 0.84miles | Magnolia Avenue in Elizabeth | Jefferson Avenue | North Avenue in Elizabeth | |||
| 0.2miles | Acme Street in Elizabeth | Linden Avenue | Route 439 in Elizabeth | |||
| 0.7miles | CR 509 Spur in Springfield | South Springfield Avenue | CR 635 in Springfield | |||
| 0.75miles | CR 655 in Berkeley Heights | McMane Avenue | CR 527 in Berkeley Heights | |||
| 2.6miles | CR 527 / CR 695 in Watchung | Plainfield Avenue | CR 512 in Berkeley Heights | Route runs through a portion of Somerset County, but is entirely maintained by Union County.[3] Former southern segment (Bonnie Burn Road) transferred to Somerset County as CR 695 in October 2023[4] . | ||
| 4.09miles | CR 527 in Scotch Plains | Sky Top Drive, Coles Avenue, Summit Lane | CR 643 in Mountainside | |||
| 2.37miles | US 22 in Mountainside | Summit Avenue, Baltusrol Road | CR 527 in Summit | |||
| 0.9miles | CR 642 in Mountainside | Tanager Way, Deer Path | CR 645 in Mountainside | |||
| 3.46miles | CR 613 in Mountainside | New Providence Road, Deer Path, W R Tracy Drive | CR 527 in Summit | |||
| 0.1miles | CR 658 in Elizabeth | Elizabethtown Plaza | Caldwell Place in Elizabeth | Serves county complex | ||
| 1.9miles | CR 622 in New Providence | South Street, Passaic Street | CR 647 at the Morris County line in New Providence | |||
| 1.29miles | Route 27 in Rahway | West Milton Avenue | US 1-9 in Rahway | |||
| 2.21miles | CR 512 in Summit | Constantine Place, Passaic Avenue, River Road | Route 24/CR 649 at the Essex County line in Summit | |||
| 1.38miles | Route 27 in Rahway | West Scott Avenue, East Scott Avenue | US 1-9 in Rahway | |||
| 2.3miles | CR 527 in Summit | Morris Avenue, River Road, Chatham Road | Summit Avenue at the Morris County line in Summit | |||
| 0.4miles | CR 608 in Clark | Ross Street | Route 27 in Rahway | |||
| 0.77miles | CR 606 in Westfield | West Broad Street | Route 28 in Westfield | |||
| 0.67miles | US 22 in Springfield | Hillside Avenue | CR 635 in Springfield | |||
| 6.84miles | CR 607 in Clark | Lake Avenue, Martine Avenue, Park Avenue, New Providence Road, Diamond Hill Road | CR 622 in New Providence | Gap in route through a portion of Somerset County as CR 655 | ||
| 0.71miles | Fairway Drive South in Union | Fairway Drive East | CR 619 in Union | |||
| 1.5miles | CR 651 in Summit | Summit Avenue | Route 24/Route 124 in Summit | |||
| 0.2miles | Route 27 in Elizabeth | Rahway Avenue | CR 623 in Elizabeth | Serves county complex | ||
| 0.39miles | CR 644 in Mountainside | Ackerman Avenue | CR 642 in Mountainside |