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 1500 to 1999 that do not have portions within the State Primary and State Secondary systems.

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KY 1508

Kentucky Route 1508 is a rural secondary highway in southern Union County. The highway begins at KY 109 in the village of Grangertown west of Sturgis. The highway heads west and receives the west end of Old Providence Road, which leads to KY 923. KY 1508 heads west along the northern edge of the Big Rivers Wildlife Management Area and State Forest to Caseyville, where the route turns north and runs along the Ohio River. KY 1508 crosses an unnamed stream and passes the Union County Boat Ramp on its way to Mulfordtown, where the road veers away from the river. At Dekoven, the highway runs concurrently with KY 492 north to the latter highway's terminus at KY 667. KY 1508 continues northeast to its terminus at KY 109.

KY 1531

Kentucky Route 1531 is a rural secondary highway that begins in northeastern Bullitt County and ends in northwestern Shelby County, but the route spends almost all of its length in the city of Louisville in eastern Jefferson County. The highway begins at KY 1319 (Kings Church Road) near Whitfield. KY 1531 heads northwest along Dawson Hill Road then turns northeast onto Routt Road to enter the city of Louisville and Jefferson County. The highway crosses Wheelers Run and Back Run and meets the eastern end of KY 1819 (Brush Run Road) south of the Routt neighborhood of Louisville. KY 1531 follows Sheckels Run to its crossing of Cane Run and reaches KY 155 (Taylorsville Lake Road) south of Fisherville. The highway runs concurrently with KY 155 northwest across Floyds Fork of the Salt River to KY 148 (Taylorsville Road), with which the route heads east through Fisherville and across Floyds Fork again.

KY 1531 splits north from KY 148 onto Eastwood Fisherville Road, which crosses another Brush Run and passes under a Norfolk Southern Railway line. The highway crosses Shakes Run and Long Run and passes under I-64 with no access on its way to Eastwood, where the highway intersects KY 2841 and US 60 (Shelbyville Road). KY 1351 continues on Johnson Road, which parallels and then intersects an R.J. Corman Railroad Group line and passes to the east of Valhalla Golf Club. The highway crosses a third Brush Run and briefly follows a bend of Floyds Fork. KY 1351 veers northeast onto Aiken Road at the junction with that county road and reaches its northern terminus at KY 362, which heads west on Ash Avenue and northeast on Aiken Road, just north of the Jefferson–Shelby county line.

KY 1533

Kentucky Route 1533 is a rural secondary highway in northern Allen County. The highway begins at KY 234 (Cemetery Road) north of Settle and heads east as Meador Port Oliver Road. KY 1533 crosses Little Difficult Creek, intersects KY 101 (Smiths Grove Road) at Meador, and crosses Difficult Creek. The highway reaches its east end at KY 252 (Barren River Dam Road) south of the dam that impounds the Barren River to create Barren River Lake.

KY 1575

Kentucky Route 1575 is a urban secondary highway in the city of Somerset in Pulaski County. The west–east highway begins at KY 2227 and travels east intersecting KY 1247 before terminating at KY 39. It is known as University Drive for its entire length.

KY 1580

Kentucky Route 1580 is a rural secondary highway in the city of Somerset in Pulaski County. The west–east highway begins at KY 1247 and travels east until the end of state maintenance.

KY 1583

Kentucky Route 1583 (KY 1583) was a state highway in Ohio County. It followed Horse Branch Loop. The highway traveled through the main area of Horse Branch and ended at U.S. Route 62 (US 62). KY 1583 was given to Ohio County on March 1, 2021.

KY 1649

Kentucky Route 1649 is a rural secondary highway in eastern Casey County. KY 1649 begins at KY 70 (Middleburg Street) next to the Green River in the city of Liberty. The highway heads southeast along Dry Ridge Road, which has a curvaceous course between the sources of many streams on its way to KY 501, with which the route runs concurrently for at Lawhorn Hill. KY 1649 continues along Poplar Hill Road between more sets of stream headwaters before reaching its eastern terminus at KY 837 at Argyle. The Kentucky Transportation Cabinet established the highway through a May 18, 1987, official order. KY 1649 was relocated at its western end; the agency made the change of course official and transferred Old KY 1649 to county maintenance through a December 12, 2012, official order.

KY 1651

Kentucky Route 1651 is a rural secondary highway in southern and central McCreary County. The highway runs between a pair of intersections with US 27 near Pine Knot and Marshes Siding, between which the highway runs concurrently with KY 92 in Stearns and serves Whitley City, the unincorporated county seat of McCreary County. KY 1651 begins at a four-legged intersection with US 27 and KY 92, which run concurrently from Pine Knot to Stearns, and KY 2792. KY 1961 heads southwest to Southern Highway, onto which the route turns north and continues south as a county highway through the center of Pine Knot. The highway meets the eastern end of KY 3251 (Round Top Road) and parallels the Norfolk Southern Railway to Revelo, where the route crosses to the west side of the railroad and meets the eastern end of KY 742. KY 1961 meets the northern end of KY 741 and crosses the Big South Fork Scenic Railway, also part of the Kentucky and Tennessee Railway, immediately before it turns east onto its concurrency with KY 92 in Stearns.

KY 1651's splits north from KY 92 just west of that highway's bridge across the railroads. The highway passes through the Stearns Administrative and Commercial District and by the historic Stearns Golf Course. North of the village center, KY 1651 meets the eastern ends of KY 3259 (Winchester Road) and KY 701 (Poplar Springs Road) and passes by the Stearns ranger station of Daniel Boone National Forest. The highway crosses over the Norfolk Southern Railway and meets the northern end of KY 2278 (Ball Cemetery Road) at the south end of Whitley City. KY 1651 meets the western ends of KY 478 (Williamsburg Street) and KY 3253 (Cora Cooper Road) and crosses back to the west side of the railroad. The highway intersects KY 700 in Marshes Siding and crosses over the railroad again before reaching its northern terminus at US 27.

KY 1667

Kentucky Route 1667 is a supplemental road in eastern Shelby County. The highway extends from the state maintenance boundary, from which Boat Dock Road continues south to serve Guist Creek Lake, north to KY 1779 (Benson Pike) east of Shelbyville.

KY 1721

Kentucky Route 1721 is a rural secondary highway north of the city of Somerset in rural Pulaski County. The west–east highway begins at KY 1247 and travels east until the end of state maintenance as a continuation as Estesburg Road.

KY 1727

Kentucky Route 1727 is a rural secondary highway in southwestern Louisville in Jefferson County. The highway follows Terry Road from Johnsontown Road north through an intersection with KY 1931 (Greenwood Road) to KY 1934 (Cane Run Road). The Kentucky Transportation Cabinet established KY 1727 through a March 23, 1983, official order. KY 1934 was moved from Terry Road to the new Greenbelt Highway, and KY 1727 was assigned to part of the bypassed part of KY 1934.

KY 1749

Kentucky Route 1749 is a rural secondary highway in northeastern Warren County and southwestern Edmonson County. The highway begins at KY 185 just south of its bridge over the Green River. KY 1749 heads northeast along Glenmore Road through Glenmore to the Warren–Edmonson county line just south of the river. The highway, now named Wingfield Church Road, approaches the Green River again to cross Little Beaverdam Creek at its confluence with the Green River. The highway heads south away from the Green River and approaches the Warren–Edmonson county line before reaching its terminus at KY 743 (Chalybeate School Road) south of Nick.

KY 1767

Kentucky Route 1767 is a 0.18 mi (0.28 km) supplemental road in Owensboro that runs in a north–south direction on the portion of Hawes Boulevard between KY 2830 and U.S. 60.

KY 1770

Kentucky Route 1770 is a rural secondary highway in eastern Lincoln County. The highway begins at US 150 (John Sims Highway) east of Rowland. KY 1770 follows Old US 150 southeast to KY 3177, which continues east on Old US 150 while KY 1770 turns south onto Old Ottenheim Road. The highway crosses Walnut Flat Creek and Boone Creek and curves east through Sugar Grove. KY 1770 crosses a branch of Cedar Creek and Cedar Creek itself, which here forms an arm of Cedar Creek Lake. The highway passes southeast of William Whitley House State Historic Site before reaching its eastern terminus at KY 643 just west of that highway's intersection with US 150 southwest of Crab Orchard.

KY 1778

Kentucky Route 1778 is a rural secondary highway in southwestern Lincoln County. KY 1778 begins at KY 198 in the village of McKinney. The highway heads south along Geneva McKinney Road parallel to a Cincinnati, New Orleans and Texas Pacific Railway and Norfolk Southern Railway line. At Geneva, the highway begins to run concurrently with KY 698 on Green River South Road. KY 1778 crosses McKinney Creek on the overlap and crosses the Green River just after splitting east from KY 698. The highway parallels the railroad into the valley of the South Fork Green River, then the route turns to follow the creek east after the railroad continues southeast. KY 1778 crosses the river and follows a curvaceous path to its eastern terminus at KY 501 (Kings Mountain Road) northeast of Kings Mountain. The Kentucky Transportation Cabinet extended KY 1778 northwest over its KY 698 overlap to Geneva and on Geneva McKinney Road to McKinney through an October 22, 2001, official order.

KY 1779