{{Short description|State highway in northwestern Ohio, US}} {{Multiple issues| {{One source|date=December 2025}} {{Unreliable sources|date=December 2025}} }} {{Use American English|date=May 2025}} {{Use mdy dates|date=January 2025}} {{Infobox road |state=OH |type=SR |route=100 |map = {{maplink|frame=yes|plain=yes|frame-align=center|frame-width=290|frame-height=260|type=line|stroke-width=3|from.map}} |map_custom = yes |length_mi=39.02 |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=1924 |direction_a=South |terminus_a={{jct|state=OH|SR|309}} near Iberia |junction= *{{jct|state=OH|US|30}} in Bucyrus *{{jct|state=OH|US|224}} in Tiffin |direction_b=North |terminus_b={{jct|state=OH|SR|53}} in Tiffin |counties=Marion, Crawford, Seneca |previous_type=SR |previous_route=99 |next_type=SR |next_route=101 }} [[Image:OH State Routes 4 19 100 south at US 30.jpg|thumb|State Route 100 concurrent with State Routes 4 and 19 near Bucyrus]]
'''State Route 100''' ('''SR 100''') is a north–south highway in northwestern Ohio. Its southern terminus is at State Route 309 near Iberia, and its northern terminus is at State Route 53 in Tiffin.
==History== Established in 1924, the original routing was from {{convert|1|mi|km|adj=on}} north of Brokensword to Tiffin.<ref name="ohhwys">[http://pages.prodigy.net/john.simpson/highways/100.html Route 100] (The Unofficial Ohio State Highways Web Site) by John Simpson{{unreliable source?|failed=y|date=August 2014}} {{webarchive |url=https://web.archive.org/web/20041226033543/http://pages.prodigy.net/john.simpson/highways/100.html |date=December 26, 2004 }}</ref> In 1939, it was extended to {{convert|12|mi|km}} south of Bucyrus along route 19 from {{convert|1|mi|km|adj=on}} north of Brokensword to {{convert|3|mi|km}} south of Bucyrus and an unnumbered road from {{convert|3|mi|km}} south of Bucyrus to {{convert|12|mi|km}} south of Bucyrus.<ref name="ohhwys" />
==Major intersections== {{OHinttop}} {{OHint |county=Marion |location=Iberia |mile=0.0 |type= |road=25px SR 309 |notes=Southern Terminus. }} {{OHint |county=Crawford |cspan=8 |location=Bucyrus |lspan=5 |mile=9.11 |type=concur |road=20px SR 19 |notes=Southern terminus of SR 19 concurrency; SR 19 continues south. }} {{OHint |mile=12.53 |type=concur |road=20px SR 4<br>20px SR 98 |notes=Southern terminus of SR 4/SR 98 concurrency; SR 4/SR 98 continue south. }} {{OHint |mile=12.67 |type=concur |road=20px SR 98 |notes=Northern terminus of SR 98 concurrency; SR 98 continues north. }} {{OHint |mile=13.46 |road=20px US 30 |notes=Full-access interchange with US 30. }} {{OHint |mile=14.02 |type=concur |road=20px SR 4 |notes=Northern terminus of SR 4 concurrency; SR 4 continues north. }} {{OHint |mile=21.3 |type=concur |township=Lykens |ctdab=Crawford |lspan=3 |road=20px SR 19 |notes=Northern terminus of SR 19 concurrency; SR 19 continues north. }} {{OHint |mile=25.12 |type=concur |road=25px SR 103 |notes=Eastern terminus of SR 103 concurrency; SR 103 continues east. }} {{OHint |mile=25.26 |type=concur |road=25px SR 103 |notes=Western terminus of SR 103 concurrency; SR 103 continues west. }} {{OHint |county=Seneca |cspan=7 |location=Melmore |lspan=2 |mile=30.57 |type=concur |road=20px SR 67 |notes=Southern terminus of SR 67 concurrency; SR 67 continues south. }} {{OHint |mile=30.83 |type=concur |road=20px SR 67 |notes=Northern terminus of SR 67 concurrency; SR 67 continues north. }} {{OHint |location=Tiffin |lspan=5 |mile=35.56 |road=25pxUS 224 }} {{OHint |mile=37.88 |type=concur |road=25px SR 231 |notes=Southern terminus of SR 231 concurrency; SR 231 continues south. }} {{OHint |mile=38.23 |type=concur |road=25px SR 231 |notes=Northern terminus of SR 231 concurrency; SR 231 ends. }} {{OHint |mile=38.29 |road=20px SR 18<br>25px SR 101 }} {{OHint |mile=39.02 |road=20px SR 53 |notes=Northern terminus. }} {{OHintbtm|keys=concur}}
==References== {{Attached KML}} {{Reflist}}
100 Category:Transportation in Marion County, Ohio Category:Transportation in Crawford County, Ohio Category:Transportation in Seneca County, Ohio