The following highways are numbered 615:
| Preceded by 614 | Lists of highways 615 | Succeeded by 616 |
North Carolina Highway 168 (NC 168) is a primary state highway in the U.S. state of North Carolina. Known as Caratoke Highway, the state highway runs 18.28 miles (29.42 km) from US 158 in Barco north to the Virginia state line in Moyock, where the highway continues as Virginia State Route 168 (SR 168) toward Norfolk, Virginia. NC 168 forms part of the primary north–south highway of Currituck County, where it provides access to the county seat of Currituck. The state highway also provides a crucial link for traffic between the Hampton Roads region of Virginia and the Outer Banks.
State Route 615 (SR 615) is a 6.93-mile-long (11.15 km) north–south state highway in the northeastern portion of the U.S. state of Ohio. SR 615 runs from its southern terminus at a signalized intersection with SR 306 in Kirtland to its northern terminus at a signalized intersection with SR 283 in Mentor-on-the-Lake.
Maryland Route 615 (MD 615) is a state highway in the U.S. state of Maryland. The state highway runs 4.35 miles (7.00 km) from Interstate 70 (I-70) and U.S. Route 40 (US 40) east of Hancock north to the Pennsylvania state line, where the highway continues as State Route 2001 (SR 2001) in Fulton County. MD 615 has two sections, an east–west section that closely parallels I-70 and US 40 and a north–south highway that follows Heavenly Acres Ridge. The ridge road was constructed as MD 615 in the mid-1930s. The east–west segment is part of the original alignment of US 40 constructed in the mid-1910s. After I-70 was constructed east of Hancock in the early 1960s, MD 615 was extended to its current length parallel to the new freeway.
State Route 6 (SR 6) is a state highway that is unsigned. It travels through the central part of the U.S. state of Tennessee from Lawrence County to Sumner County. The highway is related to the following U.S. Highways:
State Route 106 is a north–south state highway in Middle Tennessee. The highway is a secret, or hidden, designation for the following highways:
