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The Canadian provinceofOntario has an extensive network of Primary (King's), Secondary, and Tertiary Highways, with county-level and city-level roads linking between them. Over the years, however, Ontario has turned back numerous highways to municipal government bodies, renumbered them, or upgraded them to 400-series highways.
In 1997 and 1998, many sections of the provincial highway network were downloaded to local municipalities (such as cities, counties or regional municipalities) by the Ontario Ministry of Transportation as a cost-saving measure. While highways were occasionally transferred to local governments in the past, the 1997–1998 downloads represented the most significant changes to Ontario's highway network. Many highways were completely devolved, while of others only short sections remain under provincial jurisdiction (Highway 2, once stretching across Southern Ontario, now is only a few kilometres long). Below is a partial list of partially or wholly devolved highways since 1997.
Highway 2 – Windsor to the Ontario-Quebec boundary, now Lake Shore Boulevard, Kingston Road, Toronto Road, Dundas Street, and Loyalist Road. Its purpose was largely superseded by Highway 401 and 403; only a 1.1-kilometre section near Gananoque remains.
Highway 2A
Highway 2B – Formerly Ontario Highway 2AinChatham, Ontario from 1961 to 1970; decommissioned and route reverted to local street names (Richmond Street, Queen Street, School Street, 5th Street and Thames Street)
Highway 2S
Highway 3 – between St. Thomas and Leamington and within the urban areas of Port Colborne and Fort Erie.
Highway 3B
Highway 4 – Downgraded portions: south of Highway 3 in Talbotville Royal, and north/east of Highway 8
Highway 4A
Highway 5 – Downgraded all of the Paris-Scarborough route except one 12.7 km section between Ontario Highway 8 and Ontario Highway 6
Highway 5A
Highway 6 – Downgraded portions: south/west of Port Dover
Highway 7 – Downgraded the portion in York Region west of Donald Cousens Parkway / York Regional Road 48.
Highway 7A
Highway 7B – Highway 7 west of Carleton Place to Highway 15 in Carleton Place.
Highway 8 – From WinonatoNiagara Falls, and, more recently, from Peters Corners to Winona.
Highway 8A
Highway 8B
Highway 9 – Split into two segments in Orangeville area and eastern end cut past Highway 400 towards Newmarket due to downgrading of various portions.
Highway 10 – Hurontario StreetinMississauga and Main Street in Brampton were formerly part of this route, but lost the designation with the completion of Highway 410 through the area. The Highway 10 designation is still in use north of Brampton.
Highway 11 – from Barrie southward; Now known as Yonge Street, York County Road 1, and Simcoe County Road 4.
Highway 11A – Toronto; Gardiner Expressway/Lake Shore BoulevardtoHighway 401. Now known only as York Street, University Avenue, Avenue Road, and Oriole Parkway.
Highway 11B – Cobalt-New Liskeard. Portions of the road in Coleman Township are still signed as 11B.
Highway 12 – Whitby—south of Highway 407 right-of-way.
Highway 12A
Highway 12B
Highway 14 – Marmora to Highway 62 near Foxboro, the 14 numbering originally continued south (on what is now Highway 62) to Picton. Only one of the *15 Ontario highways (2–17 with 13 skipped) to be completely dropped from the system.
Highway 15 – From CFB KingstontoHighway 401, now Kingston Road 15, and from Carleton PlacetoArnprior, now Lanark County Road 29 and Ottawa Road 29.
Highway 15A
Highway 16 – Upgraded to a 400 series highway (Highway 416). Only exists as a short connector highway between Highway 416 north of Highway 401 and Leeds & Grenville County Road 2 (formerly Highway 2). The section north of North Gower, which is different from the original route, is designated Ottawa Road 73 (Prince of Wales Drive).
Highway 17 – Replaced by Highway 417 south and east of Arnprior to the Ontario/Quebec border.
Highway 17A
Highway 17B
Highway 18 – From WindsortoLeamington, now Essex County Road 20
Highway 18A
Highway 18B
Highway 19 – From terminus at Port Burwell to Highway 3 in Tillsonburg; from Highway 401 to terminus at Highway 86 near Milverton. The section from Tillsonburg to Highway 401 remains.
Highway 20 – From QEW exit 88 east of HamiltontoHighway 58 near Allanburg and from Thorold Townline Road to Niagara Falls, now Regional Road 20 (Confederation Parkway through Stoney Creek, Rymal Road, and Lundy's Lane); only a 1.9-kilometre section near Allanburg remains.
Highway 21 – Portions South of Highway 402
Highway 22 – London, Ontario to near Warwick, Ontario, connecting to Sarnia, Ontario and to Arkona by Highway 7; replaced by most of routing of Highway 402
Highway 23 – Portion between Highway 89 in Palmerston to the Highway 9 Junction at Teviotdale downloaded; rerouted over section of Highway 89 in 2003
Highway 24 – 2 km south of Cambridge and northward through Guelph, Orangeville, Shelburne, and CollingwoodonGeorgian Bay.
Highway 24A
Highway 25 – Now Bronte Road (south of Ontario Highway 407inOakville), Ontario St/Steeles Ave/Martin St/Halton Regional Rd 25 in Milton, Halton Regional Rd 25 in Halton Hills, and Main Street in Acton. Continues in segments through Wellington & Dufferin Counties to north of Grand ValleyatHighway 89.
Highway 27 – EtobicoketoMidhurst; now referred to as Highway 27 in Toronto, York Regional Road 27 in Vaughan, and Simcoe County Road 27inSimcoe County
Highway 28 – Port Hope to Highway 7A, (which had a concurrency with Highway 115 for 13 km to the Parkway exit), up to NE of Lakefield, at Highway 134.
Highway 29 – BrockvilletoArnprior. The section from Smiths Falls to Carleton Place is now Highway 15; the rest was demoted as County Road 29.
Highway 30 – BrightontoHavelock
Highway 31 – MorrisburgtoOttawa
Highway 32 – GananoquetoHighway 15, near Seeleys Bay; now referred to as Leeds and Grenville County Road 32
Highway 33 – TrentontoPicton; the portion east of Collins Bay Road in Kingston, Ontario was also removed from the provincial system
Highway 34 – LancastertoHawkesbury
Highway 35 – Portion between Highway 401 and Highway 115 interchange in the Regional Municipality of Durham. Was concurrent with and is now part of Highway 115.
Highway 35A
Highway 35B
Highway 36 – Lindsay to Highway 28 at Burleigh Falls. Now referred to as Kawartha Lakes Road 36.
Highway 36B
Highway 38 – Kingston to Highway 7 near Sharbot Lake; now referred to as Kingston, South Frontenac and Central Frontenac Road 38
Highway 39 – Windsor to south of Belle River. (1934–1970. Now Essex County Road 22 from Essex County Road 42 to Essex County Road 2, and Essex County Road 2 into Windsor. Rendered obsolete with the completion of E.C. Row Expressway in 1970, and was absorbed into Highway 2.
Highway 40A
Highway 40B
Highway 40C
Highway 41 – Portion between Highway 2 and Highway 7 downgraded as Lennox and Addington County Road 41.
Highway 42 – Entirely downgraded, WestporttoForthton.
Highway 43 – Entirely downgraded. PerthtoAlexandria, via Smiths Falls, and Winchester deleted in 1998—Perth to Smith Falls section had been part of Ontario Highway 15 prior to renumbering of the Perth-Carleton Place-Kanata portion of 15's route as Highway 7 in 1961.
Highway 44 – Between Lanark County Road 29 (formerly Highway 15) in Almonte, Ontario and Donald B. Munro Drive (formerly Highway 17) west of Carp, Ontario (1938–1997). Now Ottawa Road 49 (March Road).
Highway 45 – Between Northumberland County Road 2 (formerly Highway 2) in Cobourg and Highway 7inNorwood. Now known as Northumberland County Road 45 and Peterborough County Road 45.
Highway 46 – Between Highway 7 and Kawartha Lakes Road 48 (formerly 
Highway 48) near Bolsover. Now Kawartha Lakes Road 46.
Highway 47 – Highway 48 north of Stouffville to Highways 7 & 12 south of Greenbank. Highway 48 – Between Kingston Road and York Regional Road 25.
Highway 49 – Between Picton and the Quinte Skyway Bridge.
Highway 50 – Toronto section; also referred to as Albion Road to Highway 89 west of Alliston.
Highway 51 – Ran from Highway 3 in Eatonville to Rondeau Provincial Park Entrance.
Highway 52 – East of Alberton to Highway 8 at Peters Corners.
Highway 53 – Highway 20 in Stoney Creek to Eastwood.
Highway 54 – Cayuga to Cainsville.
Highway 55 – Now Niagara Regional Road 55.
Highway 56 – Highway 3 west of CanfieldtoStoney Creek.
Highway 57 – Bismarck to Becketts Bridge. Deleted in 1970.
Highway 58 – From Highway 58AinWellandtoHighway 406 between Turner's Corners and Allanburg.
Highway 59 – Transferred in its entirety to the counties of Norfolk, Oxford and Perth.
Highway 61B
Highway 68 – became Highway 6 on Manitoulin Island.
Highway 69 – replaced by Highway 400 south of MacTier. Highway's length continues to shrink with extension of Highway 400 to Sudbury, and the number will disappear entirely in the future.
Highway 70 – renamed Highway 6 from Hepworth to Springmount.
Highway 73 – Port BrucetoDorchester
Highway 74 – New SarumtoNilestown. Deleted in 1997.
Highway 75 – Proposed in 1970 from Canborough to Bismarck (never built).
Highway 76 – Highway 3 in Eagle to Highway 2 northeast of Wardsville.
Highway 78 – Wallaceburg to Dresden.
Highway 79 – Highway 2 south of Bothwell to Port Franks.
Highway 80 – Courtright to Strathburn.
Highway 81 – Highway 2 west of Delaware to Grand Bend.
Highway 82 – Highway 7 south of Thedford to Port Franks. Became part of Highway 79 in 1982.
Highway 83 – Ontario Highway 21 near Grand BendtoOntario Highway 23inRusseldale.
Highway 84 – St. Joseph to Hensall.
Highway 85 – Became part of Highway 86 in 1981; Waterloo to Elmira was downloaded in 1998, remaining section of Highway 86 renumbered back to Highway 85.
Highway 86 – Original section from Elmira to Amberley downloaded in 1998; rest downloaded or became Highway 85.
Highway 87 – Bluevale to Harriston.
Highway 88 – Ontario Highway 27 junction at Bond Head to Highway 11 junction in Bradford. Existed from 1938 to 1998. Renamed as Simcoe County Road 88.
Highway 89 – Eastern end truncated at Ontario Highway 400 (original terminus was Ontario Highway 11)
Highway 90 – BarrietoAngus and CFB Borden.
Highway 91 – Duntroon to Stayner.
Highway 92 – Wasaga BeachtoElmvale
Highway 93 – South of Highway 400 interchange
Highway 95 – Wolfe Island
Highway 96 – Wolfe Island
Highway 97 – Freelton to Hickson, through Galt/Cambridge.
Highway 98 – Essex County 1938–1970. It was deleted, becoming Essex County Road 46, and Kent County (now Chatham-Kent) Road 8. Its western terminus was downtown Windsor, and its eastern terminus was downtown Blenheim, at Highways 40 and 3. Rendered obsolete with the completion of nearby freeway, Highway 401 (which paralleled Ontario Highway 98 for the majority of its length).
Highway 99 – Governor's Road (original alignment of Dundas Street from Highway 24 North of BrantfordtoAncaster
Highway 100 – Ran from MCF (ON-401) at exit 194 to Former ON-2, eastern part of London, now Veterans Memorial Parkway.
Highway 103 – Highway 400 and 12 to Highway 69 junction, first the original alignment of Highway 69, now Highway 400.
Highway 104 – to Grand Valley from Ontario Highway 9 , then Ontario Highway 25 .
Highway 106 – Welcome to Highway 28 north of Port Hope. Now Northumberland Road 74.
Highway 107 – Highway 18inRuthven, Ontario, to Highway 3 in Ruthven. Now Essex County Road 45.
Highway 109 – Hwy 500 east of Tory Hill to Paudash. Became part of Highway 121 in 1964.
Highway 111 – Hwy 500 south of Highland Grove to Dyno Mines. Renumbered Secondary Highway 648 in 1964.
Highway 114 – Highway 3 (Former alignment, now Essex County Road 34) in Maidstone, Ontario (now a part of Tecumseh, Ontario, to Highway 98 (Now Essex County Road 46). Part of road is still signed as "Old HWY 114" from Manning Road (Essex County Road 19) to Provincial Road (Essex County Road 46).
Highway 116 – Hudson to Highway 72 in Patricia.
Highway 117 – Highway 11 north of Bracebridge to Dorset.
Highway 118 – Western end truncated at Ontario Highway 11 (original terminus was Ontario Highway 169)
Highway 119 – Highway 17 west of Dryden to Richan. Renumbered Secondary Highway 665 in 1974.
Highway 120 – Highway 622 in Atikokan to Highway 17 Shabaqua Corners. Renumbered as part of Highway 11 in 1960.
Highway 121 – Highway 35 south of Fenelon FallstoHaliburton. Eastward is renamed Highway 118.
Highway 122 – QEW in Oakville to QEW in Mississauga. Decommissioned in 1970.
Highway 123 – Now Airport Road in North Bay, Ontario.
Highway 126 – MacDonald-Cartier Freeway (Highway 401) in the south end of London, Ontario (partially superhighway—Wenige Expressway) to Highway 2, some think extended to Highway 22 (present Fanshawe Park Road East), now known as Highbury Avenue. (The part between Highway 401 and the south Thames River had no name, while a half-mile section from the Thames to Hamilton Road was the Wenige Expwy, and north from there was Highbury Avenue.)
Highway 128 – Highway 17 in Kenora to Redditt. Renumbered Secondary Highway 666 (now 658) in 1974.
Highway 131 – Renamed Simcoe County Road 27.
Highway 133 – Renamed Lennox and Addington County Road 4.
Highway 134 – Renamed Highway 28 when that road was re-routed and fully absorbed Highway 134.
Highway 135 – Short highway in London, between Highway 401 and former Highways 2 & 4. Now called Exeter Road.
Highway 136 – CataracttoOrangeville. Formerly Highway 24.
Highway 148 – Highway 17toPembroke, Ontario city limits was decommissioned, now just a connecting link (which allows it to still be signed as Highway 148). Continuation of Quebec route 148.
Highway 169 – BrechintoFoote's Bay via Gravenhurst, shared space with Highway 11 from Washago to Gravenhurst.
Queen Elizabeth Way – Highway 427toLake Shore Blvd. (former Highway 2). This section is now known as the Gardiner Expressway, which is owned by the City of Toronto.
Highway 400A
Highway 500 –
Highway 501 –
Highway 503 – Between Highway 48inKirkfield and Highway 121inTory Hill. Now Kawartha Lakes Road 6, Kawartha Lakes Road 45, Peterborough County Road 503 and Haliburton County Road 503.
Highway 504 –
Highway 505 –
Highway 506 – Highway 41 to Plevna. Now known as North Frontenac Road 506. Continues east/south as North Frontenac Road 509.
Highway 507 – Between Highway 28inLakefield and Highway 503inGooderham. Now Peterborough County Road 23, Peterborough County Road 36, Peterborough County Road 507 and Haliburton County Road 507.
Highway 508 – Highway 17 west of ArnpriortoCalabogie. Entirely downloaded to Renfrew County.
Highway 509 – Highway 7 to Plevna. Now known as Central Frontenac and North Frontenac Road 509. Continues west as North Frontenac Road 506.
Highway 511 – PerthtoCalabogie. Entirely downloaded to Lanark and Renfrew counties.
Highway 512 –
Highway 513 –
Highway 514 –
Highway 515 –
Highway 517 – Used to run from Boulter to Combermere at Highway 62. Downgraded to county road status in Hastings and Renfrew counties.
Highway 521 –
Highway 536 – Passes by the ghost town of Creighton Mine near the town of LivelyinGreater Sudbury. Redesignated as Municipal Road 24.
Highway 537 – WanuptoWahnapitaeinGreater Sudbury. Partially redesignated as Municipal Road 537.
Highway 541 – New Sudbury, Garson and Skead. Redesignated as Municipal Road 86.
Highway 543 – Highway 69 to Dew Drop Road in Sudbury. Downloaded in 1973 upon the creation of the Regional Municipality of Sudbury as Long Lake Road, part of Regional Road 80. Now designated Greater Sudbury Municipal Road 80.
Highway 544 – Downtown Sudbury to Cartier. Redesignated as Highway 144 in 1965, as extension to Timmins was under construction.
Highway 545 – Hanmer, Capreol and Selwood. Redesignated as Municipal Road 84.
Highway 549 – WhitefishtoLake Panache in the town of Walden; downloaded in mid-1980s and now designated as Greater Sudbury Municipal Road 10.
Highway 555 – Highway 557 north of Blind River to Granary Lake. Downloaded in 1997.
Highway 604 –
Highway 606 –
Highway 610 –
Highway 626 –
Highway 635 – RolphtontoRapides-des-Joachims, Quebec. Interprovincial crossing downloaded to Renfrew County.
Highway 640 – Highway 571 to Earlton Airport. Transferred to township of Armstrong in 2004; now Airport Road.
Highway 644 – Highway 69 to Pointe-au-Baril. Given to The Archipelago in 2006; now South Shore Road.
Highway 646 – Linking Highway 599 with sites in the township of Pickle Lake. Now identified on signage as Pickle Lake Road.
Highway 648 – Circular road that started and ended at Highway 121 (present-day Highway 118) in Haliburton County; now Loop Road.
Highway 649 –
Highway 653 – Chenaux Road. Interprovincial crossing to Portage-du-Fort, Quebec; downloaded to Renfrew County.
Highway 658 – Section from Highway 17A to Highway 17 downloaded in 1997; now Veterans Drive.
Highway 666 – Renumbered Highway 658 in 1985.
Highway 800 - Not currently assigned. Became Highway 527 in 1976.
Highway 801 - Highway 11 to Namewaminikan River
Highway 803 - Not currently assigned. Became Highway 101 to Nighthawk Lake in 1997.
Highway 806 - Not currently assigned. Became Highway 545 in 1973.
Highway 807 - Not currently assigned. Became Highway 622 in 1989.
Highway 808 - Not currently assigned. From Highway 599 in Central Patricia to Otoskwin River Bridge. Previously an extension of Highway 599. Decommissioned in 1983.
Highway 809 - Decommissioned road near Boston Creek
Highway 812 - Not currently assigned. Became Highway 502 in 1981.
Highway 813 - Decommissioned road near Sturgeon Falls (identified as Riding Stable Road)Highway numbers have even been "recycled" (used more than once on a provincial highway), however the use tends to be as far as possible from the original routing, and generally a few decades' time separate each numbering, to minimize confusion.
King's Highways
Secondary highways
Highway 807 – FraserdaletoHighway 11atSmooth Rock Falls. Redesignated as Highway 634 in 1977. See Highway 634, an unrelated highway known today as municipal road 15 located in Greater Sudbury.