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 300 to 399 that do not have portions within the State Primary and State Secondary systems.

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KY 301

Kentucky Route 301 is a rural secondary highway in eastern Graves County. The highway begins at KY 58 next to Pryor Branch of Panther Creek southwest of Hicksville. KY 301 heads north and crosses over I-69 (Purchase Parkway). The highway crosses Pull Tight Branch and Cockes Branch south of Clear Springs, which the highway passes through between its junction with the east end of KY 483 and its crossing of Trace Creek. KY 301 gradually curves west and crosses Dry Creek before reaching its northern terminus at KY 131 south of Dogwood.

KY 306

Kentucky Route 306 is a rural secondary highway in southern Floyd County. The highway begins at the junction of Branham Hollow Road and Stoker Branch Road at the south city limit of Wheelwright. KY 306 heads north along the Right Fork Otter Creek through the center of Wheelwright and past the Otter Creek Correctional Center. North of the confluence of the right and left forks of Otter Creek, the highway follows Otter Creek proper out of the city to Wheelwright Junction, where the route crosses Left Fork Beaver Creek and reaches its northern terminus at KY 122.

KY 308

Kentucky Route 308 is a rural secondary highway in northern Pike County. The highway begins at Forest Hills Road's intersection with Kate Camp Branch Road south of Forest Hills. KY 308 follows Forest Hills Road north through the valley of the Road Fork of Pond Creek. The highway reaches its terminus near the confluence of the Road Fork with Pond Creek at US 119 opposite Belfry High School.

KY 310

Kentucky Route 310 is a rural secondary highway in northern Ballard County. The highway begins at US 60 (Paducah Road) east of LaCenter. KY 310 heads northwest along Dennis Jones Road, which crosses Frazier Creek. At KY 358 (Bandana Road), the route's name changes to Turner Landing Road. KY 310 crosses Lucy Creek and passes through a pair of right-angle curves before reaching its terminus at KY 1105 (Oscar Road) at Oscar.

History KY 310 was formed in 1954.

The original KY 310 ran from US 25W west via Cemetery Road in Williamsburg; this route was later reinstated as KY 2380 until October 14, 1981.

KY 311

Kentucky Route 311 is a rural secondary highway in southwestern Fulton County. The highway begins at the Tennessee state line, where the road continues south as Tennessee State Route 157. KY 311 heads north and crosses Owens Slough, intersects KY 1282 west of Blue Pond, intersects the Illinois Central Railroad at grade, and reaches its northern terminus at KY 94 west of Anna Lynne.

KY 314

Kentucky Route 314 is a rural secondary highway in eastern Barren County and northern Metcalfe County. The highway begins at KY 70 (Hiseville Road) at Halfway. KY 314 heads east along Center Road, which crosses Straders Branch and Blue Springs Creek before the route meets the west end of KY 2435 (Knob Lick–Blue Springs Road) at the Barren–Metcalfe county line. The highway continues on Hiseville–Center Road, which passes through Savoyard and meets the south end of KY 677 (Roberts Road) as the route approaches Center. At the west end of the village, KY 314 meets Sulphur Well Center Road, which carries KY 869 and KY 1243. KY 314 and KY 1243 comprise Main Street through the village. At the east end of the village, the two routes meet the west end of KY 1048 (Node Road) and diverge, KY 1243 onto Center Three Springs Road and KY 314 onto Center Peggyville Road. KY 314 continues north to its terminus at KY 218 (Crail Hope Road) at Shady Grove.

KY 315

Kentucky Route 315 is a rural secondary highway in southern Breathitt County. The highway begins at KY 28 south of Crockettsville. KY 315 heads east along Freemans Fork to its confluence with the Middle Fork Kentucky River, which the route follows through Crockettsville. The highway meets the west end of KY 1933 and passes through Sebastians Branch. North of Sebastians Branch, KY 315 parallels KY 3237 from the opposite side of the Middle Fork Kentucky River to both routes' termini at KY 30 south of Shoulderblade.

KY 316

Kentucky Route 316 is a rural secondary highway in southeastern Trimble County. The highway begins at US 421 southwest of Carmon. KY 316 heads northeast through the valley of the Little Kentucky River through Carmon, where the route crosses Carmon Creek. The highway crosses Daughterty Creek at its confluence with the river and meets the south end of KY 1335, where KY 316 turns east. KY 316 follows Daughterty Creek and leaves the creek valley to pass through the hamlet of Providence before reaching its eastern terminus at KY 55.

KY 318

Kentucky Route 318 was a former highway in Barren County. It was formed by 1973, running from US 31E & KY 90 east via Happy Valley Road to Bus. US 31E in Glasgow. replacing a section of KY 90 which was rerouted. The road was given to the city of Glasgow on February 3, 1992.

The original KY 318 ran from US 27 in Falmouth southwest to KY 1032 (now Crooked Creek Road) east of Cordova. This became part of an extended KY 330 when KY 1032 was rerouted further south.

KY 320

Kentucky Route 320 is a supplemental road in northern Carroll County. The highway begins at a dead end next to Kentucky River Lock & Dam No. 1 on the Kentucky River. KY 320 heads west as Lock Road, which gradually curves northward. The highway enters the city of Carrollton on 11th Street; just north of the city limit, the highway passes an entrance to General Butler State Resort Park. KY 320 reaches its northern terminus at US 42 (Highland Avenue).

KY 322

Kentucky Route 322 is a rural secondary highway in northern Shelby County and southern Henry County. The highway begins at KY 53 (La Grange Road) north of Chestnut Grove. KY 322 heads north along Lucas Road into Henry County, where the route intersects KY 22 (Ballardsville Road). The highway continues as McCoun Road to its northern terminus at KY 1861 (Mill Street and Main Street) and Giltner Road in the city of Smithfield.

KY 323

Kentucky Route 323 is a rural secondary highway in northern Green County and western Taylor County that has two segments. The western segment begins at KY 566 (Eve Road) at Eve. KY 323 follows Aetna Grove Church Road south and then northeast through the valley of the Green River to Graham Cemetery Road. The eastern section begins on the east side of the Green River and follows Nears Milby Road to Poplar School Grove Road, where the route continues on Gabe Road through Gabe to KY 61 (Hodgenville Road) in the village of Summersville. KY 337 continues east on Summersville Road, which meets the south end of KY 2763 (Summersville–Coakley Road) and crosses Sand Lick Creek before entering Taylor County. The highway continues along Bengal Road, which crosses Big Pitman Creek at Bengal and Middle Pitman Creek north of Sweeneyville. In Sweeneyville, KY 337 intersects KY 883 (Fairview Road) and continues along Friendship Pike, which heads southeast and crosses Little Pitman Creek. At the western edge of the city of Campbellsville, the highway intersects US 68 (Greensburg Road) and curves east onto Main Street. KY 337 crosses over KY 55 (New Columbia Road) and passes Campbellsville High School on its way to downtown Campbellsville. There, the highway crosses Buckhorn Creek and turns north onto Columbia Avenue for two blocks to its terminus at US 68 (Broadway).

KY 324

Kentucky Route 324 is a supplemental road in southern Mason County. The highway begins at US 62 (Bucktown Road) south of Shannon. KY 324 heads south along Raymond Road, which crosses a branch of Shannon Creek, before the route veers east. The highway intersects KY 2517 (Main Street) in Mays Lick. East of the village, KY 324 intersects US 68 and meets the north end of KY 161 (Flemingsburg–Mays Lick Road), where the route continues as Helena Road. The highway meets the south end of KY 419 (Wards Pike), intersects the Transkentucky Transportation Railroad, and meets the north end of KY 170 (Elizaville Road). KY 324 passes through Helena and crosses Mill Creek before reaching its eastern terminus at KY 11 at Weedonia.

History KY 324 was formed between 1973 and 1976 as a renumbering of part of KY 24 because of I-24.

The original KY 324 ran from US 45 in Wingo east to KY 564 east of Sedalia. This became part of KY 339 by 1973 when it was extended east.

KY 325

Kentucky Route 325 is a rural secondary highway in western Owen County. The highway begins at KY 355 next to Little Twin Creek's confluence with the Kentucky River at Moxley. KY 325 heads northeast along New Liberty–Moxley Road, which crosses Little Twin Creek then remains to the south of the creek, where the route meets the south end of KY 1669. The highway reaches its eastern terminus at KY 227 west of New Liberty.

KY 326

Kentucky Route 326 is a rural secondary highway in northeastern Anderson County. The highway begins at US 127 (Frankfort Road) at the northern edge of the city of Lawrenceburg. KY 326 heads north along Ninevah Road, which crosses Hammond Creek and turns east at Hammond Road on the east side of the village of Alton. The highway reaches its terminus at the intersection of Lanes Mill Road and Clifton Road at Ninevah.

KY 327

Kentucky Route 327 is a rural secondary highway in central Marion County. The highway begins at KY 84 (Saint Mary's Road) at Saint Mary. KY 327 meets the south end of KY 2740 (Frogtown Road), passes through Saint Charles, and crosses Hardins Creek and Cissels Creek at their confluence just south of the route's northern terminus at KY 49 (Loretto Road).

KY 328