{{Short description|State highway in northwestern Ohio, US}} {{Use American English|date=April 2025}} {{Use mdy dates|date=January 2025}} {{Infobox road |state=OH |type=SR |route=66 |map = {{maplink-road}} |map_custom=yes |map_notes=Route of SR 66 highlighted in red |length_mi=118.60 |length_round=2 |length_ref=<ref name=DESTAPE>{{cite web |url=http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Pages/DESTAPE.aspx |title=DESTAPE |publisher=Ohio Department of Transportation |date=July 3, 2014 |access-date=September 22, 2014}} *[http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Documents/DESTAPECnty/DESMIA.pdf Miami County] *[http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Documents/DESTAPECnty/DESSHE.pdf Shelby County] *[http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Documents/DESTAPECnty/DESAUG.pdf Auglaize County] *[http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Documents/DESTAPECnty/DESALL.pdf Allen County] *[http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Documents/DESTAPECnty/DESVAN.pdf Van Wert County] *[http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Documents/DESTAPECnty/DESPUT.pdf Putnam County] *[http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Documents/DESTAPECnty/DESPAU.pdf Paulding County] *[http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Documents/DESTAPECnty/DESDEF.pdf Defiance County] *[http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Documents/DESTAPECnty/DESWIL.pdf Williams County] *[http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Documents/DESTAPECnty/DESHEN.pdf Henry County] *[http://www.dot.state.oh.us/Divisions/Planning/TechServ/TIM/Documents/DESTAPECnty/DESFUL.pdf Fulton County]</ref> |established=1924 |direction_a=South |terminus_a={{jct|state=OH|US|36}} in Piqua |junction={{plainlist| *{{jct|state=OH|US|33}} in St. Marys *{{jct|state=OH|US|30}} near Delphos *{{jct|state=OH|US|224}} in Ottoville *{{jct|state=OH|US|24}} near Defiance *{{jct|state=OH|US|6}} near Evansport *{{jct|state=OH|I|80|I|90|OHTP}} near Archbold }} |direction_b=North |terminus_b={{jct|state=OH|US|20}} in Fayette |counties=Miami, Shelby, Auglaize, Allen, Van Wert, Putnam, Paulding, Defiance, Williams, Henry, Fulton |previous_type=SR |previous_route=65 |next_type=SR |next_route=67 }}

'''State Route 66''' ('''SR 66''') is a north&ndash;south state highway in the northwestern portion of the U.S. state of Ohio. Its southern terminus is at U.S. Route 36 (US&nbsp;36) in Piqua, and its northern terminus is at US 20 in Fayette. South of Defiance it generally follows the route of the former Miami and Erie Canal.

==Route description== The portion of SR 66 between Washington Avenue in Piqua and the Miami/Shelby County line is designated as the "Cpl. Samuel F. Pearson Memorial Highway",<ref>{{cite web | url = http://codes.ohio.gov/orc/5533.605 | title = 5533.605 Cpl. Samuel F. Pearson Memorial Highway. | work = Ohio Revised Code | publisher = LAW Writer | date = April 7, 2009 | access-date = May 24, 2014}}</ref> in honor of a Piqua High School graduate who was killed at Camp Victory in Baghdad, Iraq, while serving in the Army Reserve, on October 10, 2007.<ref>{{cite news | url = http://www.whio.com//news/news/route-66-renamed-in-honor-of-fallen-soldier/nHx8G/ | title = Route 66 Renamed In Honor Of Fallen Soldier | publisher = WHIO-TV | author = Staff | date = May 25, 2009 | access-date = May 24, 2014 | archive-date = May 25, 2014 | archive-url = https://web.archive.org/web/20140525201648/http://www.whio.com//news/news/route-66-renamed-in-honor-of-fallen-soldier/nHx8G/ | url-status = dead }}</ref><ref>{{ cite news | url = http://legalpronews.findlaw.com/article/f9123f5e0d8873d91b0482848397f3ff | title = Arch: Piqua's Pearson gone but not forgotten | newspaper = Dayton Daily News | last = Archdeacon | first = Tom | date = May 17, 2014 | access-date = May 24, 2014 }}</ref>

==History== left|thumb|SR&nbsp;66 through Spencerville {{prose|section|date=April 2019}} *'''1924''' – Original route established.<ref name=system>[http://pages.prodigy.net/john.simpson/highways/expls.html Explanation of the Ohio State Highway System] (The Unofficial Ohio State Highways Web Site) by John Simpson{{Unreliable source?|failed=y|date=October 2011}} {{webarchive |url=https://web.archive.org/web/20060523023100/http://pages.prodigy.net/john.simpson/highways/expls.html |date=May 23, 2006 }}</ref> Originally routed from Piqua to the Michigan state line {{convert|4|mi|km}} north of Fayette.<ref name=ohhwys>[http://pages.prodigy.net/john.simpson/highways/066.html Route 66] (The Unofficial Ohio State Highways Web Site) by John Simpson{{Unreliable source?|failed=y|date=October 2011}} {{webarchive |url=https://web.archive.org/web/20041223053913/http://pages.prodigy.net/john.simpson/highways/066.html |date=December 23, 2004 }}</ref> *'''1931''' – Truncated at Fayette; U.S. Route 127 replaced the route’s alignment from Fayette to the Michigan state line.<ref name=ohhwys/> {{Clear}}

==Major junctions== {{jcttop|length_ref=<ref name=DESTAPE/>}} {{OHint |county=Miami |location=Piqua |mile=0.00 |road={{jct|state=OH|US|36}} |notes=Southern terminus; road continues as US 36 west (Spring Street south)}} {{OHint |county=Shelby |cspan=4 |township=Loramie |ctdab=Shelby |mile=10.78 |road={{jct|state=OH|SR|48|dir1=south|city1=Russia|city2=Covington}} |notes=Northern terminus of SR 48 }} {{OHint |township=Cynthian |ctdab=Shelby |mile=12.44 |road={{jct|state=OH|SR|47|city1=Versailles|city2=Sidney}} }} {{OHint |location=Fort Loramie |lspan=2 |mile=16.68 |road={{jct|state=OH|SR|705|name1=Park Street}} }} {{OHint |mile=16.80 |road={{jct|state=OH|SR|362|dir1=north|location1=Lake Loramie State Park|name1=Elm Street}} |notes=Southern terminus of SR 362 }} {{OHint |county=Auglaize |cspan=9 |location=Minster |lspan=3 |mile=19.20 |road={{jct|state=OH|SR|362|dir1=south|name1=First Street}} |notes=Northern terminus of SR 362 }} {{OHint |type=concur |mile=19.70 |road={{jct|state=OH|SR|119|dir1=east|name1=Fourth Street}} |notes=Southern end of SR 119 concurrency }} {{OHint |type=concur |mile=20.71 |road={{jct|state=OH|SR|119|dir1=west|name2=Bensman Road}} |notes=Northern end of SR 119 concurrency }} {{OHint |location=New Bremen |mile=22.75 |road={{jct|state=OH|SR|274|name1=Monroe Street}} }} {{OHint |township=Saint Marys |ctdab=Auglaize |mile=26.80 |road={{jct|state=OH|SR|219|city1=Montezuma|city2=New Knoxville}} }} {{OHint |type=concur |location=St. Marys |lspan=2 |mile=30.19 |road={{jct|state=OH|SR|29|dir1=west|SR|116|dir2=north|SR|703|dir3=west|name2=Main Street|name3=Spring Street}} |notes=Southern end of SR 29 concurrency; southern terminus of SR 116; eastern terminus of SR 703 }} {{OHint |type=concur |mile=30.55 |road={{jct|state=OH|SR|29|dir1=east|name1=Spring Street}} |notes=Northern end of SR 29 concurrency }} {{OHint |township=Noble |ctdab=Auglaize |mile=31.34 |mile2=31.56 |road={{jct|state=OH|US|33|to2=yes|SR|29|city1=Columbus|city2=Celina|location3=Fort Wayne Ind.}} |notes=Interchange }} {{OHint |township=Salem |ctdab=Auglaize |mile=39.04 |road={{jct|state=OH|SR|197|city1=Celina|city2=Kossuth|city3=Buckland}} }} {{OHint |county=Allen |cspan=5 |location=Spencerville |mile=42.87 |road={{jct|state=OH|SR|117|name1=Fourth Street}} }} {{OHint |type=concur |township1=Spencer |township2=Amanda |ctdab=Allen |mile=44.97 |road={{jct|state=OH|SR|81|dir1=west|city1=Willshire}} |notes=Southern end of SR 81 concurrency }} {{OHint |type=concur |township=Amanda |ctdab=Allen |mile=45.21 |road={{jct|state=OH|SR|81|dir1=east|city1=Lima}} |notes=Northern end of SR 81 concurrency }} {{OHint |type=concur |location=Delphos |lspan=2 |mile=52.89 |road={{jct|state=OH|SR|697|dir1=west|name1=Second Street}} |notes=Southern end of SR 697 concurrency }} {{OHint |type=concur |mile=53.12 |road={{jct|state=OH|SR|190|dir1=north|SR|697|dir2=ends|name1=Fifth Street}} |notes=Northern end of SR 697 concurrency }} {{OHint |county=Van Wert |township=Washington |ctdab=Van Wert |mile=55.38 |mile2=55.50 |road={{jct|state=OH|US|30|city1=Van Wert|city2=Mansfield}} |notes=Interchange }} {{OHint |type=concur |county=Putnam |cspan=2 |location=Ottoville |mile=59.90 |road={{jct|state=OH|US|224|SR|189|dir2=east|name1=Third Street}} |notes=Southern end of US 224 concurrency; western terminus of SR 189 }} {{OHint |type=concur |township=Monterey |ctdab=Putnam |mile=60.98 |road={{jct|state=OH|US|224|dir1=west|city1=Van Wert}} |notes=Northern end of US 224 concurrency }} {{OHint |county=Paulding |cspan=4 |township=Washington |ctdab=Paulding |mile=67.10 |road={{jct|state=OH|SR|114|city1=Grover Hill|city2=Cloverdale}} }} {{OHint |type=concur |township=Brown |ctdab=Paulding |mile=73.17 |road={{jct|state=OH|SR|613|dir1=west|city1=Melrose}} |notes=Southern end of SR 613 concurrency }} {{OHint |type=concur |location=Oakwood |ctdab=Paulding |mile=73.39 |road={{jct|state=OH|SR|613|dir1=east|city1=Continental|name1=Walnut Street}} |notes=Northern end of SR 613 concurrency }} {{OHint |township=Auglaize |ctdab=Paulding |mile=80.46 |road={{jct|state=OH|SR|637|dir1=south|city1=Paulding}} |notes=Northern terminus of SR 637 }} {{OHint |county=Defiance |cspan=5 |location=Defiance |lspan=5 |mile=87.13 |road={{jct|state=OH|SR-Truck|66|dab1=Defiance|dir1=north|name1=Downs Street}} |notes=Southern terminus of SR 66 Truck }} {{OHint |type=concur |mile=88.10 |road={{jct|state=OH|SR|15|SR|18|dir2=east|name2=Second Street|extra=hospital|location1=Mercy Hospital of Defiance}} |notes=Southern end of SR 15/SR 18 concurrency }} {{OHint |mile=88.73 |road={{jct|state=OH|SR|111|SR-Truck|66|dab2=Defiance|dir1=south|dir2=south|name2=Clinton Street|road|West 2nd Street}} |notes=Northern termini of SR&nbsp;111 and SR&nbsp;66 Truck }} {{OHint |type=concur |mile=88.87 |road={{jct|state=OH|SR|15|SR|18|dir2=west|name2=Session Street}} |notes=Northern end of SR 15/SR 18 concurrency }} {{OHint |mile=89.67 |mile2=89.77 |road={{jct|state=OH|US|24|city1=Napoleon|city2=Antwerp}} |notes=Interchange; exit 26 on US 24 }} {{OHint |county=Williams |township=Springfield |ctdab=Williams |mile=98.71 |road={{jct|state=OH|US|6|dir1=west|city1=Edgerton}} |notes=Southern end of US 6 concurrency }} {{OHint |county=Henry |cspan=2 |township=Ridgeville |ctdab=Henry |lspan=2 |mile=101.85 |road={{jct|state=OH|US|6|dir1=east|city1=Napoleon}} |notes=Northern end of US 6 concurrency }} {{OHint |mile=102.52 |road={{jct|state=OH|SR|34|city1=Napoleon|city2=Bryan|location3=Northwest State Community College}} }} {{OHint |type=concur |county=Fulton |cspan=6 |location=Archbold |mile=107.35 |road={{jct|state=OH|SR|2|dir1=west|name1=Stryker Street}} |notes=Southern end of SR 2 concurrency }} {{OHint |type=concur |township=German |ctdab=Fulton |lspan=3 |mile=108.85 |road={{jct|state=OH|SR|2|dir1=east}} |notes=Northern end of SR 2 concurrency }} {{OHint |type=concur |mile=110.85 |road={{jct|state=OH|US|20A|dir1=east|city1=Wauseon}} |notes=Southern end of US 20A concurrency }} {{OHint |type=concur |mile=111.97 |road={{jct|state=OH|US|20A|dir1=west|city1=West Unity}} |notes=Northern end of US 20A concurrency }} {{OHint |type=toll |township=Franklin |ctdab=Fulton |mile=112.71 |road={{jct|state=OH|I|80|I|90|OHTP||city1=Toledo|location2=Chicago}} |notes=Exit 25 on the Ohio Tpk. }} {{OHint |location=Fayette |mile=118.60 |road={{jct|state=OH|US|20|name1=Main Street}} |notes=Northern terminus; road continues as Fayette Street}} {{jctbtm|keys=concur,toll}}

==SR 66 Truck== {{infobox road small |state=OH |type=OH-Truck |route=66 |location=Defiance, Ohio |length_mi=1.909 |length_ref=<ref name=GIS>{{cite web |url=https://gis.dot.state.oh.us/tims/Data/Download |title=Data Download - ODOT TIMS (Road Inventory shapefile) |publisher=Ohio Department of Transportation |access-date=April 14, 2019}}</ref> }}

'''SR&nbsp;66 Truck''' is a truck route which bypasses a low railroad bridge along SR&nbsp;66 in southern Defiance. Beginning at a signalized intersection with South Jefferson Avenue (SR&nbsp;66), it heads west on Downs Street through a residential neighborhood. At South Clinton Street, SR&nbsp;111, SR&nbsp;111 Truck becomes concurrent with SR&nbsp;66 Truck and both head northwest along Deatrick Street passing a supermarket and three sets of railroad tracks at-grade. At Baltimore Street (former SR&nbsp;424), the two truck routes turn northeast onto Holgate Avenue paralleling the Maumee River. After heading through a residential neighborhood of the city, the road bends to the east and transitions to West Third Street. After passing under a railroad bridge, it passes numerous businesses and city facilities before reaching SR&nbsp;111 again at the intersection of Third Street and Clinton Street. While SR&nbsp;111 Truck ends, SR&nbsp;66 Truck continues on South Clinton Street with SR&nbsp;111 for one block before ending at SR&nbsp;15/SR&nbsp;18/SR&nbsp;66.<ref name=GM_Truck>{{google maps |url=https://www.google.com/maps/dir/41.2732461,-84.3675814/41.2866944,-84.3621068/@41.2801835,-84.3793248,3271m/am=t/data=!3m2!1e3!4b1!4m14!4m13!1m10!3m4!1m2!1d-84.3722127!2d41.2843476!3s0x883dd1952ad65735:0xc2789c7d57fb5130!3m4!1m2!1d-84.3624048!2d41.2862137!3s0x883dd1f25632d6e7:0x2201b83fc43886df!1m0!3e0 |title=State Route 66 Truck |access-date=April 25, 2019}}</ref> {{Clear}}

==References== {{Portal|Ohio|U.S. Roads}} {{Reflist}}

==External links== {{Attached KML|display=title,inline}} {{commons category|Ohio State Route 66}}

066 Category:Transportation in Miami County, Ohio Category:Transportation in Shelby County, Ohio Category:Transportation in Auglaize County, Ohio Category:Transportation in Allen County, Ohio Category:Transportation in Van Wert County, Ohio Category:Transportation in Putnam County, Ohio Category:Transportation in Paulding County, Ohio Category:Transportation in Defiance County, Ohio Category:Transportation in Williams County, Ohio Category:Transportation in Henry County, Ohio Category:Transportation in Fulton County, Ohio