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 600 is a state highway in Muhlenberg County that runs from Kentucky Route 831 to Kentucky Route 171 northwest of Clifty.Major intersections
Kentucky Route 601 is a state highway in Muhlenberg County that runs from Kentucky Route 181 on the western Greenville city line to Kentucky Route 175 north of Graham via New Cypress.Major intersections
Kentucky Route 602
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 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. The highway was designated on September 12, 2011.
The original KY 603 ran from US 421 to KY 602 in Central City. This was given to the city on May 5, 1994.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.Major intersections
Kentucky Route 605
Kentucky Route 605 is a state highway that runs from Kentucky Route 1183 and Manton Road at Manton to U.S. Route 62 in far northeastern Bardstown via Botland and Woodlawn.Major intersections
Kentucky Route 606
Kentucky Route 606 is a state highway in Nicholas County that runs from Bald Hill Road northeast of Barterville to U.S. Route 68 southwest of Ellisville.Major intersections
Kentucky Route 607
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.Major intersections
Kentucky Route 609
Kentucky Route 609 is a state highway in Pendleton County that runs from Kentucky Route 159 at Concord to Kentucky Route 177 east of Meridian.Major intersections
Kentucky Route 611
Kentucky Route 611 is a state highway in Pike County that runs from Kentucky Route 195 at Lookout to U.S. Routes 23 and 119 east of Jonancy via Lookout.Major intersections
Kentucky Route 612 is a state highway in northeastern Pike County that runs from Kentucky Route 468 south of Rural to Kentucky Route 292 northeast of Turkey Creek via Turkey Creek.Major intersections
Kentucky Route 613
Kentucky Route 613 is a state highway in eastern Powell County that runs from Kentucky Routes 11 and 15 at Bowen to Forestry Road No. 23 at the Menifee County line northeast of Old Lombard.Major intersections
Kentucky Route 614
Kentucky Route 614 was a state Highway in Calloway County. It ran from KY 280 east of Pottertown east via Poplar Springs Road. The road was given to Calloway County on June 16, 1985.Kentucky Route 615
Kentucky Route 615 is a state highway in central Powell County that runs from Kentucky Route 213 at Morris to Kentucky Route 599 northwest of Bowen.Major intersections
Kentucky Route 616
Kentucky Route 616 is a state highway that runs from Kentucky Routes 1029 and 2505 northwest of Fairview to Kentucky Route 875 southwest of Germantown via Abigail.Major intersections
Kentucky Route 617 is a state highway in southwestern Robertson County that runs from U.S. Route 62 east of Kentontown to Kentucky Route 165 and Piqua Lane northwest of Piqua.Major intersections
Kentucky Route 618 is a state highway that runs from Kentucky Route 1781 at Broughtentown to Kentucky Route 1250 south of Spiro via Dog Walk and Quail.Major intersections
Kentucky Route 619
Kentucky Route 619 is a state highway in Russell County that runs from Kentucky Route 92 southeast of Montpelier to Kentucky Route 379 in downtown Russell Springs via Rose Crossroads and Jamestown.Major intersections
Kentucky Route 621 is a state highway in Simpson County that runs from Kentucky Route 103 southeast of Auburn to U.S. Route 31W north of Franklin.Major intersections
Kentucky Route 623
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.Major intersections
Kentucky Route 624
Kentucky Route 624 is a state highway in far northeastern Trigg County and far northwestern Christian County that runs from Kentucky Routes 124 and 126 in Cerulean to Kentucky Route 91 and Old Princeton Road southeast of Bainbridge.Major intersections
Kentucky Route 625
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.Major intersections
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.Major intersections
Kentucky Route 629
Kentucky Route 629 is a state highway in far eastern Ohio County and western Breckinridge County that runs from Kentucky Route 54 southeast of Fordsville to Kentucky Route 992 southeast of Mattingly via Rockvale.Major intersections
Kentucky Route 630
Kentucky Route 630 is a state highway in northern Hopkins County and south central Webster County that runs from Kentucky Route 262 and John Hardy Road south of Manitou to Kentucky Route 132 on the eastern Dixon city line via Manitou and Vanderburg.