List of longest state highways in the United States

In the United States, each state maintains its own system of state highways.^[a] This is a list of the longest state highways in each state. As of 2007^[update], the longest state highway in the nation is Montana Highway 200, which is 706.624 miles (1,137.201 km) long. The shortest of the longest state highways is District of Columbia Route 295, which is only 4.29 miles (6.90 km) long.

List of highways

Longest state highways by state
State	Highway	mi	km	References
Alabama	State Route 3	386.449	621.929	^[1]
Alaska	Route 1	545.92	878.57	^[2]
Arizona	State Route 87	272.66	438.80	^[3]
Arkansas	Highway 7	296.01	476.38	^[4]
California	State Route 1	655.84	1,055.47	^[5]
Colorado	State Highway 14	236.92	381.29	^[6]
Connecticut	Route 15	83.53	134.43	^[7]
Delaware	Route 1	103.02	165.79	^[8]
District of Columbia	Route 295	4.29	6.90	^[9]^[b]
Florida	State Road A1A	338.752	545.168	^[10]^{[failed verification]}^[c]
Georgia	State Route 11	374	602	^[11]
Hawaii	Route 11	122.3	196.8	^[12]
Idaho	State Highway 75	170.666	274.660	^[13]
Illinois	Route 1^{[disputed – discuss]}	336	541	^[14]
Indiana	State Road 37	229.4	369.2	^[15]
Iowa	Highway 3	326.163	524.908	^[16]
Kansas	K-4	367	591	^[17]
Kentucky	Route 80	464.936	748.242	^[18]
Louisiana	LA 1	431.587	694.572	^[19]
Maine	State Route 11	401.2	645.7	^[20]
Maryland	Route 2	79.24	127.52	^[21]
Massachusetts	Route 28	151.93	244.51	^[22]
Michigan	M-28	290.373	467.310	^[23]
Minnesota	State Highway 1	345.954	556.759	^[24]
Mississippi	Highway 15	344.305	554.105	^[25]
Missouri	Route 5	355	571	^{[citation needed]}
Montana	Highway 200	706.624	1,137.201	^[26]
Nebraska	Highway 92	489.08	787.10	^[27]
Nevada	State Route 318	110.775	178.275	^[28]
New Hampshire	Route 16	149.75	241.00	^[29]
New Jersey	Route 47	75.19	121.01	^[30]^[d]
New Mexico	State Road 120	119.9	193.0	^[31]
New York	State Route 17	396.84	638.65	^[32]
North Carolina	Highway 24	284	457	^{[citation needed]}
North Dakota	Highway 200	420	680	^{[citation needed]}
Ohio	State Route 7	335.98	540.71	^[33]
Oklahoma	State Highway 3	615.0	989.7	^[34]^[e]
Oregon	Route 140^{[disputed – discuss]}	237.01	381.43	^[35]
Pennsylvania	Route 18	205	330	^[36]
Rhode Island	Route 138	48.3	77.7	^[37]
South Carolina	Highway 9	257	414	^[38]
South Dakota	Highway 34	419.01	674.33	^{[citation needed]}
Tennessee	State Route 1	538.8	867.1	^{[citation needed]}
Texas	State Highway 16	541.8	871.9	^[39]
Utah	State Route 24	160.243	257.886	^[40]
Vermont	Route 100	216.55	348.50	^[41]
Virginia	State Route 40	227.68	366.42	^[42]
Washington	State Route 20	436.13	701.88	^[43]
West Virginia	Route 20	262.1	421.8	^[44]
Wisconsin	Highway 35	412.15	663.29	^[45]
Wyoming	Highway 789	407.10	655.16	^[46]