The following highways are numbered 603:
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The following highways are numbered 603:
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| Preceded by 602 | Lists of highways 603 | Succeeded by 604 |
State Route 137 is a primary state highway in the U.S. state of Virginia. The state highway runs 12.03 miles (19.36 km) from SR 40 in Kenbridge east to SR 46 at Danieltown. SR 137 runs concurrently with SR 138 in eastern Lunenburg County and connects Kenbridge with SR 46, the main north–south highway of Brunswick County.
State Route 603 (SR 603) is a north–south state highway in the northern portion of the U.S. state of Ohio. Its southern terminus is at State Route 95 near Perrysville, and its northern terminus is at State Routes 61 and 98 in Plymouth along the Baseline Road that separates Huron County and Richland County, and subsequently the southern boundary of the Firelands and Connecticut Western Reserve.
State Route 430 is an east–west state highway in the northern portion of Ohio. The western terminus of State Route 430 is at an interchange with State Route 309 in Ontario. Its eastern terminus is at a T-intersection with State Route 603 just outside Mifflin.
State Route 505 (SR 505) is a short state highway in the U.S. state of Washington. It connects the towns of Winlock and Toledo to Interstate 5 (I-5) and SR 504.
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:
