{{Short description|State highway in southwestern Ohio, US}} {{Use American English|date=May 2025}} {{Use mdy dates|date=January 2025}} {{Infobox road |state=OH |type=SR |route=138 |map=OH 138 map.svg |length_mi=60.37 |length_round=2 |length_ref=<ref name="sld">{{cite web |url=http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Pages/Straight-Line-Diagrams.aspx |title=Technical Services Straight Line Diagrams |author=Ohio Department of Transportation |author-link=Ohio Department of Transportation |access-date=April 30, 2010}}</ref> |established=1923 |direction_a=West |terminus_a={{jct|state=OH|SR|134|CR|39|county2=Highland}} in Buford |junction= *{{jct|state=OH|US|50|US|62|SR|73}} in Hillsboro *{{jct|state=OH|US|35}} near Clarksburg |direction_b=East |terminus_b={{jct|state=OH|US|22|CR|5|county2=Pickaway}} near Williamsport |counties=Highland, Ross, Pickaway |previous_type=SR |previous_route=137 |next_type=SR |next_route=139 }}
'''State Route 138''' ('''SR 138''') is an east–west state highway in the southwestern portion of the U.S. state of Ohio. Its west terminus is at its intersection with SR 134 in Buford and its eastern terminus is at its intersection with US 22 east of Williamsport.<ref name=GM>{{google maps |url=https://maps.google.com/maps?saddr=OH-138+N&daddr=OH-138+N%2FMain+St&hl=en&sll=39.33214,-83.436685&sspn=0.913505,1.783905&geocode=FRhDVAIdM6MA-w%3BFUAPXAIdwgwN-w&mra=prev&t=m&z=10 |accessdate=February 21, 2014}}</ref>
==History== SR 138 was first designated on its current route between Hillsboro and Greenfield in 1923, though the road had been a part of the state highway system since its creation in 1912 as SR 260.<ref name=ODOT1923_map>{{cite map |title=Map of Ohio Showing State Routes |url=http://www.dot.state.oh.us/Divisions/TransSysDev/Innovation/prod_services/Documents/StateMaps/otm1923a.sid |format=MrSID |publisher=Ohio Division of Highways |year=1923 |cartography=L.A. Boulay, Director |access-date=August 18, 2013}}</ref><ref name=ODOT1912_map>{{cite map |title=Map of Ohio Showing Inter-County Highways |url=http://www.dot.state.oh.us/Divisions/TransSysDev/Innovation/prod_services/Documents/StateMaps/otm1912a.sid |format=MrSID |publisher=Ohio State Highway Department |year=1912 |cartography=James R. Marker, State Highway Commissioner |access-date=August 18, 2013}}</ref><ref name=ODOT1922_map>{{cite map |title=Map of Ohio State Highways Showing All Improved Roadways |url=http://www.dot.state.oh.us/Divisions/TransSysDev/Innovation/prod_services/Documents/StateMaps/otm1922a.sid |format=MrSID |publisher=ODOH |year=1922 |cartography=E.C. Blosser |access-date=August 18, 2013}}</ref> The route was extended in 1937 from its two ends to the route it travels today.<ref name=ODOT1936_map>{{cite map |title=1936 Official Highway Map |url=http://www.dot.state.oh.us/Divisions/TransSysDev/Innovation/prod_services/Documents/StateMaps/otm1936a.sid |format=MrSID |publisher=ODOH |year=1936 |cartography=John Jaster, Jr., Director |access-date=August 19, 2013}}</ref><ref name=ODOT1937_map>{{cite map |title=Official Ohio Highway Map 1937 |url=http://www.dot.state.oh.us/Divisions/TransSysDev/Innovation/prod_services/Documents/StateMaps/otm1937a.sid |format=MrSID |publisher=ODOH |year=1937 |cartography=John Jaster, Jr., Director |access-date=August 19, 2013}}</ref> No major changes to SR 138's routing have occurred since then.{{Cn|date=July 2025}}
==Major junctions== {{jcttop|length_ref=<ref name="sld"/>}} {{OHint |county=Highland |cspan=9 |township=Clay |ctdab=Highland |mile=0.00 |road={{jct|state=OH|SR|134|CR|39|county2=Highland|name2=Greenbush Road}} }} {{OHint |township=Hamer |ctdab=Highland |mile=7.03 |road={{jct|state=OH|SR|131|dir1=west}} |notes=Eastern terminus of SR 131 }} {{OHint |location=Hillsboro |lspan=3 |mile=15.35 |type=concur |road={{jct|state=OH|US|62|dir1=west|SR|73|dir2=east|name2=South High Street|road|East South Street}} |notes=Western end of US 62 / SR 73 concurrency }} {{OHint |mile=15.54 |type=concur |road={{jct|state=OH|US|50|SR|73|dir2=west|SR|124|name3=Main Street}} |notes=Eastern end of SR 73 concurrency }} {{OHint |mile=16.30 |type=concur |road={{jct|state=OH|US|62|dir1=east|name1=North High Street}} |notes=Eastern end of US 62 concurrency }} {{OHint |township=Paint |ctdab=Highland |mile=25.18 |road={{jct|state=OH|SR|771|dir1=north}} |notes=Southern terminus of SR 771 }} {{OHint |location=Greenfield |lspan=3 |mile=32.48 |type=concur |road={{jct|state=OH|SR|753|dir1=south|name1=South 7th Street}} |notes=Western end of SR 753 concurrency }} {{OHint |mile=32.79 |type=concur |road={{jct|state=OH|SR|28|dir1=west|name1=Jefferson Street|road|North 7th Street}} |notes=Western end of SR 28 concurrency }} {{OHint |mile=33.23 |type=concur |road={{jct|state=OH|SR|41|dir1=north|SR|753|dir2=north|name2=Washington Street}} |notes=Western end of SR 753 concurrency / eastern end of SR 41 concurrency }} {{OHint |county=Ross |cspan=3 |township=Buckskin |ctdab=Ross |mile=33.81 |type=concur |road={{jct|state=OH|SR|28|SR|41|dir1=east|dir2=south|CR|1|county3=Ross|name3=Thrifton Road}} |notes=Eastern end of SR 28 / SR 41 concurrency }} {{OHint |township=Concord |ctdab=Ross |mile=45.40 |road={{jct|state=OH|US|35|city1=Chillicothe|city2=Dayton}} |notes=Interchange }} {{OHint |location=Clarksburg |mile=50.68 |road={{jct|state=OH|SR|207|name1=Main Street}} }} {{OHint |county=Pickaway |township=Wayne |ctdab=Pickaway |mile=60.37 |road={{jct|state=OH|US|22|CR|5|county2=Pickaway|name2=Smith Hulse Road}} }} {{jctbtm|keys=concur}}
==References== {{Attached KML|display=title,inline}} {{Reflist}}
138 Category:Transportation in Highland County, Ohio Category:Transportation in Ross County, Ohio Category:Transportation in Pickaway County, Ohio