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The following is a list of county routes in Mercer 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 Mercer County:^[1]

• CR 518, CR 524, CR 526, CR 533, CR 535, CR 539, CR 546, CR 569, CR 571, CR 579, CR 583

Route	Length (mi)[2]	Length (km)	From	Via	To	Notes
CR 600	1.69	2.72	CR 579 in Ewing	Sam Weinroth Road	CR 611 in Ewing
CR 601[3]	0.37	0.60	CR 579 in Ewing	Sam Weinroth Road	Unnamed road in Ewing	Merged with (CR 600)
CR 602	0.64	1.03	CR 535 in West Windsor	South Post Road	Dead end in West Windsor
CR 604	2.95	4.75	CR 569 in Lawrence	Rosedale Road, Elm Road	US 206 in Princeton
CR 605	0.76	1.22	Route 27 in Princeton	River Road	CR 605 at the Somerset County line in Princeton
CR 606	3.57	5.75	US 206 in Trenton	Hamilton Avenue	Route 33 in Hamilton
CR 607	0.37	0.60	North Mill Road in West Windsor	Hendrickson Drive	CR 526/571 in West Windsor
CR 608	0.77	1.24	CR 533 in Lawrence	Lawrence Station Road	Lawrence Station Road in Lawrence
CR 609	0.68	1.09	Main Street in Hamilton	Church Street	CR 524 in Hamilton
CR 611	3.55	5.71	CR 634 in Ewing	Scotch Road	CR 546 in Hopewell Township
CR 612	2.45	3.94	Woodsville Road at the Hunterdon County line in Hopewell Township	Marshalls Corner-Woodsville Road	CR 654 in Hopewell Township
CR 613	1.28	2.06	US 206 southbound on the Ewing/Lawrence/Trenton triple point	Spruce Street	CR 636 in Ewing
CR 614	0.97	1.56	Trenton line in Hamilton	Nottingham Way	Route 33 in Hamilton
CR 615	1.85	2.98	Route 64/CR 526/CR 571 in West Windsor	Cranbury Road	CR 615 at the Middlesex County line in West Windsor
CR 616	1.35	2.17	CR 535 in Hamilton	Whitehead Road	Business US 1 in Lawrence Township
CR 618	2.81	4.52	CR 533 / CR 535 in Hamilton	Nottingham Way	Route 33 in Hamilton
CR 619	1.75	2.82	CR 533 in Hamilton	Kuser Road	CR 606 in Hamilton
CR 620	2.13	3.43	I-195 / CR 524 in Hamilton	Arena Drive	CR 622 in Hamilton
CR 622	6.33	10.19	CR 533 in Hamilton	Olden Avenue	CR 634 in Ewing
CR 623	2.87	4.62	CR 579 in Hopewell Township	Pennington-Harbourton Road	Route 31 in Pennington
CR 624	1.98	3.19	Eglantine Ave. in Pennington	East Delaware Avenue, Pennington-Rocky Hill Road	Titus Mill Road in Hopewell Township
CR 625	2.21	3.56	CR 624 in Hopewell Township	Elm Ridge Road	CR 569 in Hopewell Township
CR 626	2.07	3.33	Assunpink Creek bridge in Trenton	Chambers Street	US 206 in Hamilton
CR 627	1.25	2.01	CR 634 in Ewing	Prospect Street, Buttonwood Drive	CR 636 in Ewing
CR 629	1.13	1.82	End of county maintenance in Princeton	North Harrison Street	US 1 in West Windsor
CR 630	1.10	1.77	CR 539 in East Windsor	Windsor-Perrineville Road, Imlaystown Road	Nurko Road at the Monmouth County line in East Windsor
CR 631	0.77	1.24	CR 546 in Hopewell Township	Ingleside Avenue	CR 640 in Pennington
CR 632	1.00	1.61	CR 640 in Hopewell Township	Pennington-Lawerence Road, Blackwell Road	Benjamin Trail in Hopewell Township
CR 633	1.00	1.61	CR 539 in Hightstown	Monmouth Street	NJ 33 in East Windsor
CR 634	4.93	7.93	Route 175 in Ewing	West Upper Ferry Road, Parkway Avenue	Ingham Avenue in Ewing
CR 635	1.13	1.82	North Clinton Avenue/South Clinton Avenue in Trenton	East State Street	CR 535 and North Logan Avenue/South Logan Avenue on the Trenton/Hamilton line
CR 636	5.71	9.19	West State Street in Trenton	Parkside Avenue, Ewingville Road, Upper Ferry Road	CR 611 in Ewing
CR 637	2.60	4.18	Route 29 in Ewing	Jacobs Creek Road, Bear Tavern Road, Jacobs Creek Road	CR 546 in Hopewell Township
CR 638	5.03	8.10	US 1 in Lawrence	Renaissance Lane, Clarksville-Grovers Mill Road	CR 615 in West Windsor
CR 639	0.33	0.53	CR 622 in Ewing	Arctic Parkway	CR 613 in Ewing
CR 640	2.23	3.59	Route 31 / CR 546 in Hopewell Township	Pennington Road, South Main Street, North Main Street	Route 31 in Hopewell Township
CR 641	2.20	3.54	CR 526 / CR 535 in West Windsor	Windsor Road, Church Street	Main Street in Robbinsville
CR 643	4.13	6.65	Route 29 in Ewing	Lower Ferry Road	Reed Road on the Ewing/Hopewell township line
CR 644	0.81	1.30	CR 526 in West Windsor	Village Road	New Village Road in West Windsor
CR 645	0.21	0.34	US 206 southbound in Lawrence	Brunswick Circle Extension	US 206/Business US 1 at the Brunswick Circle in Lawrence
CR 647	1.78	2.86	CR 579 in Ewing	Nursery Road	CR 611 in Hopewell Township
CR 648	0.62	1.00	CR 636 in Ewing	Whitehead Road Extension	Dead end in Ewing
CR 649	1.64	2.64	CR 616 in Hamilton	Sweetbriar Avenue, Sloan Avenue	I-295 in Hamilton
CR 650	1.20	1.93	Lamberton Street in Trenton	Lalor Street	US 206 in Hamilton
CR 652	0.13	0.21	Route 33 in Hamilton	Nottingham Way	CR 535 in Hamilton
CR 653	1.53	2.46	West State Street in Trenton	Calhoun Street	US 206 southbound in Trenton
CR 654	3.05	4.91	Route 31 in Hopewell Township	Pennington-Hopewell Road	CR 518 in Hopewell
CR 672	2.17	3.49	CR 660 at the Burlington County line in Hamilton	Church Street, South Broad Street	CR 524 in Hamilton Township

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