In addition to those listed below, the following 500-series county routes serve Mercer County:[1]
| Route | Length
(mi)[2] | Length
(km) | From | Via | To | Notes |
|---|
| {{sort|600| CR 600}} | 1.69|mi|km|2|disp=table|sortable=on}} | CR 579 in Ewing | Sam Weinroth Road | CR 611 in Ewing |
| {{sort|602| CR 602}} | 0.64|mi|km|2|disp=table|sortable=on}} | CR 535 in West Windsor | South Post Road | Dead end in West Windsor |
| {{sort|604| CR 604}} | 2.95|mi|km|2|disp=table|sortable=on}} | CR 569 in Lawrence Township | Rosedale Road, Elm Road | US 206 in Princeton |
| {{sort|605| CR 605}} | 0.76|mi|km|2|disp=table|sortable=on}} | Route 27 in Princeton | River Road | CR 605 at Somerset County line in Princeton |
| {{sort|606| CR 606}} | 3.57|mi|km|2|disp=table|sortable=on}} | US 206 in Trenton | Hamilton Avenue | Route 33 in Hamilton |
| {{sort|607| CR 607}} | 0.37|mi|km|2|disp=table|sortable=on}} | North Mill Rd. in West Windsor | Hendrickson Drive | CR 571/526 in West Windsor |
| {{sort|608| CR 608}} | 0.77|mi|km|2|disp=table|sortable=on}} | CR 533 in Lawrence Township | Lawrence Station Road | Lawrence Station Road in Lawrence Township |
| {{sort|609| CR 609}} | 0.68|mi|km|2|disp=table|sortable=on}} | Main St. in Hamilton | Yardville-Groveville Road | CR 524 in Yardville |
| {{sort|611| CR 611}} | 3.55|mi|km|2|disp=table|sortable=on}} | CR 634 in Ewing | Scotch Road | CR 546 in Hopewell Township |
| {{sort|612| CR 612}} | 2.45|mi|km|2|disp=table|sortable=on}} | Woodsville Road at Hunterdon County line in Hopewell Township | Marshalls Corner-Woodsville Road | CR 654 in Hopewell Township |
| {{sort|613| CR 613}} | 1.28|mi|km|2|disp=table|sortable=on}} | US 206 southbound on the Ewing/Lawrence/Trenton triple point | Spruce Street | CR 636 in Ewing |
| {{sort|614| CR 614}} | 0.97|mi|km|2|disp=table|sortable=on}} | Trenton line in Hamilton | Nottingham Way | Route 33 in Hamilton |
| {{sort|615| CR 615}} | 1.85|mi|km|2|disp=table|sortable=on}} | Route 64/CR 571/CR 526 in West Windsor | Cranbury Road | CR 615 at Middlesex County line in West Windsor |
| {{sort|616| CR 616}} | 1.35|mi|km|2|disp=table|sortable=on}} | CR 535 in Hamilton | Whitehead Road | US 1 Bus. in Lawrence Township |
| {{sort|618| CR 618}} | 2.81|mi|km|2|disp=table|sortable=on}} | CR 533/CR 535 in Hamilton | Nottingham Way | Route 33 in Hamilton |
| {{sort|619| CR 619}} | 1.75|mi|km|2|disp=table|sortable=on}} | CR 533 in Hamilton | Kuser Road | CR 606 in Hamilton |
| {{sort|620| CR 620}} | 2.13|mi|km|2|disp=table|sortable=on}} | I-195/CR 524 in Hamilton | Arena Drive | CR 622 in Hamilton |
| {{sort|622| CR 622}} | 6.33|mi|km|2|disp=table|sortable=on}} | CR 533 in Hamilton | Olden Avenue | CR 634 in Ewing |
| {{sort|623| CR 623}} | 2.87|mi|km|2|disp=table|sortable=on}} | CR 579 in Hopewell Township | Pennington-Harbourton Road | Route 31 in Pennington |
| {{sort|624| CR 624}} | 1.98|mi|km|2|disp=table|sortable=on}} | Eglantine Ave. in Pennington | East Delaware Avenue, Pennington-Rocky Hill Road | Titus Mill Rd. in Hopewell Township |
| {{sort|625| CR 625}} | 2.21|mi|km|2|disp=table|sortable=on}} | CR 624 in Hopewell Township | Elm Ridge Road | CR 569 in Hopewell Township |
| {{sort|626| CR 626}} | 2.07|mi|km|2|disp=table|sortable=on}} | Assunpink Creek bridge in Trenton | Chambers Street | US 206 in Hamilton |
| {{sort|627| CR 627}} | 1.25|mi|km|2|disp=table|sortable=on}} | CR 634 in Ewing | Prospect Street, Buttonwood Drive | CR 636 in Ewing |
| {{sort|629| CR 629}} | 1.13|mi|km|2|disp=table|sortable=on}} | End of county maintenance in Princeton | North Harrison Street | US 1 in West Windsor |
| {{sort|630| CR 630}} | 1.10|mi|km|2|disp=table|sortable=on}} | CR 539 in East Windsor | Windsor-Perrineville Road, Imlaystown Road | Nurko Road at Monmouth County line in East Windsor |
| {{sort|631| CR 631}} | 0.77|mi|km|2|disp=table|sortable=on}} | CR 546 in Hopewell Township | Ingleside Avenue | CR 640 in Pennington |
| {{sort|632| CR 632}} | 1.00|mi|km|2|disp=table|sortable=on}} | CR 640 in Hopewell Township | Pennington-Lawerence Road, Blackwell Road | Benjamin Trail in Hopewell Township |
| {{sort|633| CR 633}} | 1.00|mi|km|2|disp=table|sortable=on}} | CR 539 in Hightstown | Monmouth Street | NJ 33 in East Windsor |
| {{sort|634| CR 634}} | 4.93|mi|km|2|disp=table|sortable=on}} | Route 175 in Ewing | West Upper Ferry Road, Parkway Avenue | Ingham Ave. in Ewing |
| {{sort|635| CR 635}} | 1.13|mi|km|2|disp=table|sortable=on}} | Clinton Ave. in Trenton | East State Street | CR 535/North/South Logan Avenue on the Trenton/Hamilton line |
| {{sort|636| CR 636}} | 5.71|mi|km|2|disp=table|sortable=on}} | West State Street in Trenton | Parkside Avenue, Ewingville Road, Upper Ferry Road | CR 611 in Ewing |
| {{sort|637| CR 637}} | 2.60|mi|km|2|disp=table|sortable=on}} | Route 29 in Ewing | Jacobs Creek Road, Bear Tavern Road, Jacobs Creek Road | CR 546 in Hopewell Township |
| {{sort|638| CR 638}} | 5.03|mi|km|2|disp=table|sortable=on}} | US 1 in Lawrence Township | Renaissance Lane, Clarksville-Grovers Mill Road | CR 615 in West Windsor |
| {{sort|639| CR 639}} | 0.33|mi|km|2|disp=table|sortable=on}} | CR 622 in Ewing | Arctic Way | CR 613 in Ewing |
| {{sort|640| CR 640}} | 2.23|mi|km|2|disp=table|sortable=on}} | Route 31/CR 546 in Hopewell Township | South Main Street, North Main Street | Route 31 in Hopewell Township |
| {{sort|641| CR 641}} | 2.20|mi|km|2|disp=table|sortable=on}} | CR 535/526 in West Windsor | Windsor Road, Church Street | Main Street in Robbinsville |
| {{sort|643| CR 643}} | 4.13|mi|km|2|disp=table|sortable=on}} | Route 29 in Ewing | Lower Ferry Road | Reed Road at Ewing/Hopewell Township border |
| {{sort|644| CR 644}} | 0.81|mi|km|2|disp=table|sortable=on}} | CR 526 in West Windsor | Village Road | New Village Road in West Windsor |
| {{sort|645| CR 645}} | 0.21|mi|km|2|disp=table|sortable=on}} | US 206 southbound in Lawrence Township | Brunswick Circle Extension | US 206/US 1 Bus. at Brunswick Circle in Lawrence Township |
| {{sort|647| CR 647}} | 1.78|mi|km|2|disp=table|sortable=on}} | CR 579 in Ewing | Nursery Road | CR 611 in Hopewell Township |
| {{sort|648| CR 648}} | 0.62|mi|km|2|disp=table|sortable=on}} | CR 636 in Ewing | Whitehead Road Extension | Dead end in Ewing |
| {{sort|649| CR 649}} | 1.64|mi|km|2|disp=table|sortable=on}} | CR 616 in Hamilton | Sweetbriar Avenue, Sloan Avenue | I-295 in Hamilton |
| {{sort|650| CR 650}} | 1.20|mi|km|2|disp=table|sortable=on}} | Lamberton Street in Trenton | Lalor Street | US 206 in Trenton |
| {{sort|652| CR 652}} | 0.13|mi|km|2|disp=table|sortable=on}} | Route 33 in Hamilton | Nottingham Way | CR 535 in Hamilton |
| {{sort|653| CR 653}} | 1.53|mi|km|2|disp=table|sortable=on}} | West State Street in Trenton | Calhoun Street | US 206 southbound in Trenton |
| {{sort|654| CR 654}} | 3.05|mi|km|2|disp=table|sortable=on}} | Route 31 in Hopewell Township | Pennington-Hopewell Road | CR 518 in Hopewell |
| {{sort|672| CR 672}} | 2.17|mi|km|2|disp=table|sortable=on}} | CR 660 at Burlington County line in Hamilton | Church Street, South Broad Street | CR 524 in Hamilton Township |
1. ^{{cite web|url=http://www.state.nj.us/transportation/refdata/sldiag/500%20Routes.pdf|title=500 Series Routes straight line diagram|publisher=New Jersey Department of Transportation|accessdate=May 23, 2012}}
2. ^{{cite web|url=http://www.state.nj.us/transportation/refdata/sldiag/Mercer.pdf|title=Mercer County straight line diagram|publisher=New Jersey Department of Transportation|accessdate=May 30, 2012}}
{{NJCR}}