Ohio State Route 31

	State Route 31
Length:	32.12 mi (51.69 km)
Formed:	1926
South end:	SR 38 in Marysville
North end:	US 68 in Kenton
Counties:	Union, Hardin
	Ohio highways
< SR 29	SR 32 >
	Interstates - U.S. Routes - State Routes

Southern terminus in Marysville.

Near the northern terminus in Kenton.

State Route 31 is an Ohio state highway that currently runs from Marysville to Kenton. Before 1938, however, it stretched far longer, from Pomeroy on the Ohio River to Findlay.

[edit] Cities and villages along route

County	Location	Mile	Roads intersected	Notes
Union	Marysville	0.0	SR 38	Northern terminus of SR 38
		0.4	Main Street	Former routing of SR 4
		1.4	US 33 US 36 SR 4
	Broadway	7.8	SR 347
	Summersville	11.9	SR 47
	Byhalia	15.6	SR 739
	Byhalia	16.2	SR 739
Hardin	Mount Victory	2.4	SR 273	eastern terminus of SR 273
	Kenton	10.2	SR 292	northern terminus of SR 292
		11.1	SR 53
		11.5	SR 309
		11.6	SR 67
		11.7	SR 53
		11.8	US 68

1924: Route 21 established from Pomeroy to Findlay.^[4]^[5]
1926: Route 21 renumbered as SR 31 to avoid confusion with US 21.^[2]^[4]
1932: SR 10 assigned concurrently with SR 31 from Kenton to Findlay.^[2]
1933: SR 10 replaced with US 68.^[2]
1938: US 33 established along SR 31 between Marysville and Marble Cliff, and between Columbus and Pomeroy. SR 31 truncated to new southern terminus at Columbus.^[2]
1943: SR 31 truncated to new southern terminus at Marysville, eliminating US 33 concurrency.^[2]
1952: SR 31 truncated to new northern terminus at Kenton, eliminating US 68 concurrency.^[2]

^ All mileages from ODOT Straight Line Diagrams unless otherwise noted.
^ ^a ^b ^c ^d ^e ^f ^g Route 31 John Simpson's Unofficial Ohio State Highways Web Site
^ ^a ^b ^c ^d ^e Microsoft Streets & Trips 2004 software
^ ^a ^b Explanation of the Ohio State Highway System John Simpson's Unofficial Ohio State Highways Web Site
^ Route 21 John Simpson's Unofficial Ohio State Highways Web Site