Middlesex County Routes
Middlesex County goes from 601 to 622 and 651 to 699, with some missing. For the most part odd go N-S and even go E-W. Most routes under 650 are signed with a standard pentagon; 650 and over are only signed on street signs hanging at the traffic lights.
601
Vail Av and 7th St south of Dunellen.
665 529 678 671 605 Union(601)
602
Inman Av from Holly Park to Rahway, then thru Union County and back into Middlesex on Randolph Av and Roosevelt Av.
605 NJ444/GSP(no access) Union(602)
Union(at 514) I95/NJTP 604 604
603
Hamilton Blvd and Plainfield Av in Plainfield.
529 663 605(begin 605 multiplex) 605(end 605 multiplex) Union(603)
604
Oak Tree Rd, Green St, Port Reading Av, Roosevelt Av, and Washington Av from Oak Tree to Carteret.
531 661 NJ444/GSP(no access) 650 NJ27 657 US1 US9(begin US9 multiplex) US9(end US9 multiplex) NJ35 514(begin 514 multiplex) 514(end 514 multiplex) I95/NJTP(no access) 611 602 602
605
Clinton Av, Sampton Av, Plainfield Av, Maple Av, and Old Raritan Rd in Plainfield.
Union(
605) 601 663 603(begin 603 multiplex) 603(end 603 multiplex) 531 602 Union(605)
606
Milltown Rd and Main St from south of New Brunswick to South River. Unsigned.
NJ171 US1 I95/NJTP(no access)
617 NJ18 527 535
607
Lincoln Blvd in Middlesex.
Somerset
622(begin 622 multiplex) 622(end 622 multiplex) NJ28
608
Cozzens Ln and Adams Ln in North Brunswick. Unsigned.
NJ27 US1 US130
695
609
Landing Ln and Metlars Ln from New Brunswick to Piscataway. Originally it was only signed north of NJ 18, but now it's all signed, at least on the traffic light signs [Ray Martin].
Somerset(
617) 622(begin 622 multiplex) NJ18/622(end 622 multiplex) 674 665 529
610
Henderson Rd, Deans Ln, and Deans Rhode Hall Rd from Franklin Park to Rhode Hall. Signed.
NJ27 US1(begin US1 multiplex) US1(end US1 multiplex)
679(begin 679 multiplex) 679(end 679 multiplex) US130 I95/NJTP(no access) 535
611
State St and West Av from Perth Amboy to Port Reading. Unsigned.
616/656 658 NJ440(EB off WB on) 652 604
612
Forsgate Dr, Pergola Rd, and Matchaponix Rd tru Jamesburg. I-95/NJTP exit 8A. Signed.
I95/NJTP(at NJ32)
619 615 522(begin 522 multiplex) 522(end 522 multiplex) 613
613
Tracy Station Rd, DeVoe Av, Main Sd, and Summerhill Rd from Tracy to South River. Signed.
522 612 615(begin 615 multiplex) 615(end 615 multiplex) 617 535
614
Mapleton Rd, Scudders Mill Rd, Dey Rd, Prospect Plains Rd, and Hoffman Station Rd from Kingston to Hoffman. Used to use Plainsboro Rd and Half Acre Rd from US 1 to 615. Was 622 from 535 to 615. No EB access across US 1 since it was realigned and the old jughandle removed. Signed east of US 1.
NJ27 US1(begin US1 multiplex)(right turns only) US1(end US1 multiplex) 683 US130 535(begin 535 multiplex) 535(end 535 multiplex) I95/NJTP(no access) 619 615(begin 615 multiplex) 615(end 615 multiplex) 522
615
Cranbury Neck Rd, Cranbury Station Rd, Union Valley-Half Acre Rd, Lincoln Av, Helmetta Rd, Main St, Bordentown-Amboy Tpk, and Bordentown Av from Grovers Mill to South Amboy. Signed.
Mercer(
615) 535(begin 535 multiplex) 535(end 535 multiplex) US130 I95/NJTP(no access) 619 614(begin 614 multiplex) 614(end 614 multiplex) 612 522 613(begin 613 multiplex) 613(end 613 multiplex) NJ18/527(begin 527 multiplex) 527(end 527 multiplex) 677 675 673 US9 NJ444/GSP(no access) NJ35 688 Stevens Av
616
New Brunswick Av in Perth Amboy. Unsigned.
501 656 NJ444/GSP NJ440(EB on WB off) 655 NJ35 653 658 611/656
617
Rues Ln, Ryders Ln, and Clifton Av bypassing South River to the SW. A sign NB at Clifton Av says END 617 but the NJDOT county map continues it to NJ 172. Signed.
527 NJ18 613 535 606 I95/NJTP(no access) US1 NJ172/527
619
Etra Rd, Butcher Rd, and Applegarth Rd from Twin Rivers to west of Jamesburg. Also Monmouth 28A on the southern end.
Mercer Etra Rd(end Monmouth 28A multiplex) NJ33 615 614 612 698
620
Nassau St south of New Brunswick. Maybe more. Unsigned.
NJ171 ?
622
Raritan Ave, Lincoln Blvd, and River Rd from NJ 28 east of Bound Brook to NJ 27/CR 514 east of New Brunswick. It was 514 SPUR; Ray Martin and Leo Auray said that 622 signs were posted in late March or early April 2000. It was also temporarily signed NJ 18 from NJ 18's current north end to 607 (Lincoln Blvd); it was never state maintained though. Update 5-16-00 by Joseph Chow: CR 622 is now signed on NJ 18, but it is still signed CR 514 SPUR on NJ 27.
It is 7.44 miles long. Signed N-S.
NJ27 692 NJ18/609(begin 609 multiplex) 609(end 609 multiplex) I287 607(begin 607 multiplex) 607(end 607 multiplex) NJ28
622
Now 614 from 535 to 615.
650
Middlesex Av, New Dover Rd, and Avenel St in Woodbridge.
604 651 NJ27 NJ35 US1/US9 514
651
Colonia Blvd SW of Rahway.
650 Union
652
Woodbridge Av from Woodbridge to Sewaren.
514 I95/NJTP(no access) 611
653
Amboy Av from Perth Amboy to Woodbridge. Old NJ 35.
616 NJ440 NJ35
655
Florida Grove Rd in Perth Amboy.
616 NJ440 NJ184/501 NJ35
656
Crows Mill Rd and Smith St in Perth Amboy.
616 NJ440(EB off WB on) NJ444/GSP(no access) US9 NJ35 658 611/616 658
657
Lafayette Av, Roosevelt Dr, Oakwood Av, Evergreen Rd, Thornall St, and Middlesex-Essex Tpk. 1 way NB on Lafayette Av north of US 1.
501 US1/660(begin 1 way NB) Lafayette Av(end 1 way NB) NJ444/GSP(S-W ramp) 604
658
Herbert St, Market St, Water St, and Fayette St in Perth Amboy.
656 656 611 616
660
Woodbridge Av and Grand View Av in Metuchen.
531 US1/657
661
Plainfield Rd in Edison.
531 604
663
Clinton Av in Plainfield.
603 605
665
Washington Av, Stelton Rd, and New Market Rd in Piscataway.
609 I287 529(begin 529 multiplex) 529(end 529 multiplex) 601 678 529 dead end
669
Bridge St, Middlesex Av, and Central Av in Metuchen. Partly old NJ 27.
NJ27
501(begin 501 multiplex) 501(end 501 multiplex) 531
670
Main St and Washington Av from Sayreville to South Amboy. Used to extend west on the new 535 bridge over the South River.
535 NJ444/GSP(NB on SB off) 535 US9/NJ35 686 684
671
Rock Av east of Dunellen.
601 Union
672
George St in New Brunswick.
609 NJ18 NJ18(SB on NB off) NJ27(at NJ171/527)
673
Ernston Rd south of South Amboy.
535 615 US9 NJ444/GSP(no access) NJ35?(right turn only)
674
Suttons Ln in Rutgers Univ.
609 School St
675
Jernee Mill Rd in Sayreville.
615 535
676
Duglos Ln and Suttons Ln.
514 NJ27 Amtrak
677
River Rd, Whitehead Av, Ferry St, Reid St, and Prospect St in South River. 1 way SB north of 527. Tices Ln goes NB.
615 535(begin 535 multiplex) 535(end 535 multiplex) 527 NJ18
678
Walnut St in Dunellen.
665 529 601
679
Old Georges Rd in South Brunswick. Old US 130.
US130
522 681 610(begin 610 multiplex) 610(end 610 multiplex) US130(at 697)
680
How Ln in New Brunswick.
NJ27 NJ91 NJ26
681
Kingston Ln in South Brunswick.
522 679
682
Finnegan Ln in North and South Brunswick.
NJ27 US1
683
Parkway Av and Schalks Crossing Rd in Plainsboro.
Edgemere Av
614 OLD522
684
Main St in South Amboy. Old US 9.
US9/NJ35(at US9)
688 670 US9/NJ35
686
Feltus St in South Amboy.
615 684 670
687
Cottrell Rd in Old Bridge. Old US 9.
516 699 NJ34
688
Pine Av in South Amboy. Old NJ 35.
NJ35
615
689
Amboy Rd, Morristown Rd, Cliffwood Rd, Matawan Rd, and Laurence Pkwy in Old Bridge.
516 NJ34 NJ444/GSP NJ35
691
Livingston Av in New Brunswick. Old US 1.
New Brunswick line(at NJ26) NJ171
692
Cedar Ln in Rutgers Univ.
622 ?
693
Jersey Av in New Brunswick.
Van Dyke Av(at NJ91) NJ27
694
Church Ln in North Brunswick.
Riva Av
695
695
Old Georges Rd in North Brunswick. Old US 130. 2 parts.
US130
694 608 US130
US130 US130
696
Workhouse Rd in North Brunswick.
Jail US130
697
Old Georges Rd in Black Horse. Old US 130.
US130(at
679) US130
698
Docks Corner Rd in Jamesburg.
535 619 522
699
Spring Hill Rd in Old Bridge. Old NJ 34.
687 NJ34

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Thanks to the NJDOT Middlesex County map and Straight Line Diagrams, plus my Hagstrom Middlesex County atlas, and my personal observations.