List of Kentucky supplemental roads and rural secondary highways (600–699)
Kentucky supplemental roads and rural secondary highways are the lesser two of the four functional classes of highways constructed and maintained by the Kentucky Transportation Cabinet, the state-level agency that constructs and maintains highways in Kentucky. The agency splits its inventory of state highway mileage into four categories:
The State Primary System includes Interstate Highways, Parkways, and other long-distance highways of statewide importance that connect the state's major cities, including much of the courses of Kentucky's U.S. Highways.
The State Secondary System includes highways of regional importance that connect the state's smaller urban centers, including those county seats not served by the state primary system.
The Rural Secondary System includes highways of local importance, such as farm-to-market roads and urban collectors.
Supplemental Roads are the set of highways not in the first three systems, including frontage roads, bypassed portions of other state highways, and rural roads that only serve their immediate area.
The same-numbered highway can comprise sections of road under different categories. This list contains descriptions of Supplemental Roads and highways in the Rural Secondary System numbered 600 to 699 that do not have portions within the State Primary and State Secondary systems.
Kentucky Route 602 is a supplemental road in Central City in central Muhlenberg County. The highway begins at KY 277 in the north of downtown. KY 602 heads north along an unnamed street and meets the western end of KY 3038 before reaching its north end at KY 1031.
Major intersections
Kentucky Route 603
Kentucky Route 603 is a supplemental road in Owensboro in central Daviess County. The highway begins just south of a diamond interchange with the Wendell Ford Expressway, which carries US 60 and US 231 around the south side of Owensboro; the road continues south as Pleasant Valley Road No. 1. KY 603 passes through an S-curve and expands to a four-lane divided highway. The highway crosses over a CSX rail line and reaches its northern terminus at Fourth Street; this intersection also serves as the western terminus of KY 144.
Major intersections
Kentucky Route 604
Kentucky Route 604 is a supplemental road in Central City in central Muhlenberg County. The highway begins at US 431 just south of the U.S. Highway's four–loop ramp interchange with the Western Kentucky Parkway on the eastern edge of the city. KY 604 heads east and then turns north at Youngstown Road. The highway crosses over the parkway before reaching its north end at an acute intersection with US 62.
Kentucky Route 607 is a rural secondary highway in southern Owen County. The highway begins at US 127 south of Monterey. KY 607 heads east along New Columbus Road, which immediately crosses Cedar Creek and has a hairpin at New. The route intersects KY 227 west of Fairbanks, east of which the highway crosses Caney Creek. KY 607 meets the southern end of KY 1883 and meets the eastern end of KY 2018 at Natlee, where the route crosses Eagle Creek. The highway continues through New Columbus to its eastern terminus at KY 330 at the Owen–Grant county line.
Major intersections
Kentucky Route 608
Kentucky Route 608 is a state highway that runs from Frogtown Road at the Owen-Scott county line southeast of Natlee to U.S. Route 25 south of Stonewall.
Kentucky Route 623 is a rural secondary highway in southwestern Spencer County. The highway begins at KY 48 just north of the East Fork of Cox Creek, which forms the Spencer–Nelson county line. KY 623 heads north as Lilly Pike, which crosses the Salt River on its way to its north end at KY 44 east of Waterford.
Kentucky Route 625 is a state highway in western Trimble County that runs to and from U.S. Route 421 via Mount Pleasant and Trout.Between Corn Creek Road and US-421 this route is closed to Trucks due to the tight switchbacks and narrow nature of the road.
Kentucky Route 626 is a rural secondary highway in southeastern Butler County and western Warren County. The L-shaped highway begins at a three-legged intersection with KY 1153, which heads west as Berry's Lick Road and north as Sandy Creek Road. KY 626 heads east along Berry's Lick Road through Turnertown, also known as Berry's Lick. The highway crosses Flat Rock Branch of Muddy Creek and intersects KY 79 at Davis Crossroads. KY 626 crosses Neils Creek west of Sharer, where the route has a brief concurrency with KY 1083. The highway crosses the Butler–Warren county line and continues east on Jackson Bridge Road. KY 626 crosses the Gasper River and turns north at its junction with KY 2632. The highway joins US 231 to cross back over the Gasper River and turns north onto Highland Church Road at Hadley. KY 626 crosses William H. Natcher Parkway; on either side of the parkway, the route meets the eastern ends of a pair of frontage roads, KY 6140 and KY 6139 on the north. The highway reaches its eastern terminus at KY 1435 at Rockland.
Major intersections
Kentucky Route 628
Kentucky Route 628 is a state highway in southwestern Whitley County that runs from a dead end along Wolf Creek northeast of Ayres to U.S. Route 25W and Stringtown Road in Pleasant View.
Kentucky Route 636 is a rural secondary highway in northeastern Spencer County and southeastern Shelby County. The highway begins at KY 248 east of Taylorsville Lake. KY 636 heads north along Van Buren Road, which crosses Little Beech Creek on its way to Mount Eden, which sits on the Spencer–Shelby county line. The highway meets the eastern end of KY 1795 on the Spencer County side and intersects KY 44 on the Shelby County side. KY 636 continues northeast as Back Creek Road, which crosses and briefly parallels another Little Beech Creek. The highway passes through Junte before reaching its northern terminus at KY 395 west of Harrisonville.
Kentucky Route 640 is a rural secondary highway in western Metcalfe County. The highway begins at KY 90 at Summer Shade. KY 640 heads north along Randolph Summer Shade Road. The highway curves west and crossing Falling Timber Creek and meets the eastern end of KY 1330 very close to the Metcalfe–Barren county line. KY 640 continues northeast to Randolph, where the route turns north at the north terminus of KY 2387 and meets the west end of KY 861. KY 640 follows Wisdom Road north to its intersection with KY 3234 just south of the route's underpass of the Cumberland Parkway. The highway continues as Wisdom Knob Lick Road through an intersection with US 68 at Wisdom to its northern terminus at KY 70 west of Knob Lick.
Kentucky Route 648 is a supplemental state highway in far northeastern Bourbon County and northwestern Nicholas County that runs from Kentucky Route 1879 to U.S. Route 68 north of Millersburg.
Kentucky Route 651 is a supplemental state highway in western Wolfe County that runs from a point along Sandy Ridge Road to Kentucky Route 15 southwest of Campton.
Kentucky Route 653 is a rural secondary state highway in southwestern Fulton County that runs from Kentucky Route 94 and Cotton Gin Road to Ash Log Road and Davis Road near Sassafras Ridge.
Major intersections
Kentucky Route 654
Kentucky Route 654 is a rural secondary state highway in eastern Crittenden County that runs from Kentucky Route 120 at Tribune to Baker Hollow Road and Weston Road northwest of Mattoon via Mattoon.
Major intersections
Kentucky Route 655
Kentucky Route 655 is a rural secondary highway in western Edmonson County. The C-shaped highway begins at KY 70 northwest of Windyville. KY 655 follows Segal Road west across Gulf Creek and then south through Segal and east through Asphalt. The highway continues northeast to its terminus at KY 70 at Windyville.
Kentucky Route 661 is a rural secondary highway in far northeastern Daviess County and far northwestern Hancock County that runs from Kentucky Route 662 to Kentucky Route 657 northeast of Yelvington.
Kentucky Route 662
Kentucky Route 662 is a rural secondary highway in northeastern Daviess County and far northwestern Hancock County that runs from Kentucky Route 405 in Yelvington to Kentucky Route 657 northeast of Yelvington.
Major intersections
Kentucky Route 663
Kentucky Route 663 is a rural secondary state highway in southeastern Logan County that runs from U.S. Route 431 and Mortimer Road north of Adairville to Kentucky Route 103 south of Auburn via Schochoh andCorinth.
Major intersections
Kentucky Route 664
Kentucky Route 664 is a rural secondary state highway in southeastern Logan County and southwestern Simpson County that runs from U.S. Route 431 northeast of Oakville to Kentucky Route 383 southwest of Franklin via Schochoh and Neosheo.
Major intersections
Kentucky Route 665
Kentucky Route 665 is a rural secondary state highway in southwestern Simpson County that runs from Kentucky Route 664 to Kentucky Route 100 and George Taylor Road southeast of Middleton.
Kentucky Route 667 is a supplemental state highway in western Union County that runs from Kentucky Routes 492 and 1508 in Dekoven to Kentucky Route 871 southeast of Raleigh via Curlew, Balckburn, and Raleigh.
Major intersections
Kentucky Route 668
Kentucky Route 668 is a supplemental state highway in northwestern Union County that runs from Kentucky Route 667 to Kentucky Route 109 northwest of Henshaw.
Kentucky Route 669
Kentucky Route 669 is a supplemental state highway in eastern Union County that runs from a point along East Market Street near St. Peter's Catholic Church in southeastern Waverly to Locust Lane and Yancy Greenwell Road southeast of Hitesville via Waverly.
Kentucky Route 674 is a rural secondary state highway in northwestern Wayne County that runs from a point along Bugwood Road to Kentucky Route 92 northwest of Parnell.
Kentucky Route 678 is a rural secondary highway in western and northern Monroe County. The L-shaped highway extends from KY 87 near Akersvillenorth and east to KY 163 near Rockbridge. KY 678 begins at KY 87 north of Akersville and south of Fountain Run in southwestern Monroe County. The highway heads east along White Oak Ridge Road, which gradually curves north through intersections with KY 2509 and KY 100. KY 678 crosses Indian Creek and intersects KY 249 at Flippin. The highway continues along Stringtown Flippin Road, which follows Indian Creek to KY 2468 before veering north to cross Peter Creek west of Jeffrey. KY 678 crosses Boyd Creek and gradually curves northeast toward Mount Hermon, where the route has a very short concurrency with KY 63. The highway continues east along Mount Hermon Road, which crosses Hackers Branch of Skaggs Creek and meets the northern end of KY 2452. KY 678 runs concurrently with KY 839 through Sulphur Lick. The highway's final segment is along Homer Bartley Road, which crosses Skaggs Creek before reaching the highway's terminus at KY 163 south of Cyclone and north of Rockbridge.
Major intersections
Kentucky Route 679
Kentucky Route 679 is a supplemental and rural secondary state highway in far eastern McCreary County and far western Whitley that runs from a point along New Liberty Road west of Bear Wallow School Road to Kentucky Route 478 at Duckrun.
Kentucky Route 681
Kentucky Route 681 is a supplemental state highway in northwestern Fleming County that runs from Buchanan Road on the Nicholas County line to Kentucky Route 32 west of Cowan.
Kentucky Route 682
Kentucky Route 682 is a rural secondary state highway in northern Adair County that runs from Kentucky Route 55 southeast of Coburg to Kentucky Route 2971 northwest of Absher via Kellyville.
Kentucky Route 685
Kentucky Route 685 is a rural secondary highway in western Barren County. The highway begins at KY 1297 at Beckton. KY 685 heads north along Beckton Road, which crosses over the Cumberland Parkway just south of the highway's junction with US 68 and KY 80, which run concurrently along New Bowling Green Road. The route continues north along Stovall Road and intersects KY 2189 just south of the route's grade crossing of the CSX-operated Glasgow Railway at Stovall. KY 685 meets the southern end of KY 2143 just west of the route's intersection with KY 90. The highway continues east and then north along Wilson Road to its end at KY 70 east of Cave City.
Major intersections
Kentucky Route 687
Kentucky Route 687 is a rural secondary state highway in northeastern Laurel County and western Clay County that runs from Kentucky Route 472 southwest of Langnau to U.S. Route 421 and Kentucky Route 11 in downtown Manchester.
Major intersections
Kentucky Route 688
Kentucky Route 688 was a rural secondary state highway in Crittenden County. It ran from US 641 and Kentucky Route 91 in Marion southwest via Chapel Hill Road to Reiters View Road, and turned east on Reiters View Road to US 641 and Kentucky Route 91 in Crayne. The highway was cancelled on May 14, 2002, and the road was given to Crittenden County.
Kentucky Route 689
Kentucky Route 689 is a rural secondary state highway in northwestern Johnson County that runs from Kentucky Route 172 to Kentucky Route 1092 around and through Flatgap.
Major intersections
Kentucky Route 690
Kentucky Route 690 is a rural secondary state highway in eastern Breckinridge County that runs from Kentucky Routes 79 and 259 in southern Westview to Kentucky Route 333 and Rosetta-Corners Road at Corners via Se Ree, Fairfield, and Custer.
Kentucky Route 696 is a rural secondary state highway in southeastern Clinton County and TBA that runs from U.S. Route 127 Business southeast of Albany to Kentucky Route 1009 northwest of Windy via Savage and Gapcreek.
Major intersections
Kentucky Route 697
Kentucky Route 697 is a rural secondary state highway in southwestern Fleming County that runs from Kentucky Route 1336 south of Tilton to Kentucky Route 32 southeast of Flemingsburg via Bald Hill.