Ontario has three distinct classes of highways: the ''King's Highways'', secondary highways, and tertiary highways.
The primary routes are designated as ''King's Highways''; 400-Series Highways are a special class of King's Highway. King's Highways are currently numbered 2 to 148. The Ministry of Transportation never designated a Highway 1; before 1998, the lowest numbered highway was Highway 2. The 400-series highways include Highways 400, 401, 402, 403, 404, 405, 406, 407, 409, 410, 416, 417, 420, 427, and the Queen Elizabeth Way, which is actually secretly designated as Highway 451. Some highway numbers are suffixed with a letter. The letter will be one of "A" ("Alternate route"), "B" ("Business route"), or "S" ("Scenic route"). King's Highway markers take on one of three designs depending on its use. Standard road shields placed on the highway itself consist of a Shield design topped with a Crown . In the current design, the highway number and the word "ONTARIO" appear on the shield. Junction signs (used at intersections and on the signs of 400-Series Highways ) show a large white Crown with the route number in it. Trailblazer signs (those indicating a route "to" a highway) will look like one of the first two but will be green instead of white. The speed limit on most primary routes is 80 km/h (50 mph), although it is 90 km/h (55 mph) on certain routes in Northern and Eastern Ontario. Routes that are Freeway s are generally 100 km/h (65 mph).
Secondary highways exist in northern Ontario (and used to exist in Central and Eastern Ontario) to connect towns and remote areas to King's Highways. These highways are currently numbered from 502 to 673. Secondary highway markers are Trapezoid -shaped. On the face of the marker appear, in order from top to bottom, the Ontario Coat Of Arms , the number of the highway, and the word "ONTARIO". A few secondary highways remain Gravel -surfaced, although most have been paved. The speed limit on nearly all of these routes is 80 km/h (50 mph), although Highway 655 is posted at 90 km/h (55 mph).
Tertiary highways connect those regions in northern Ontario not served by secondary highways. These highways are currently numbered 801 to 811. Tertiary highways are marked by a simple rectangular marker with rounded corners bearing the number of the highway and the word "ONTARIO". Most of these highways are gravel-surfaced and low-standard. The speed limit on these routes is 80 km/h (50 mph) although design standards generally override such.
In addition to these three classes of highways, the Ministry of Transportation maintains several other roads which are of strategic importance to the Ministry, but which are not important enough to be given any special marking. These roads are secretly designated with 7000-series numbers.
Collectively, the entire network of roadways under the jurisdiction of the Ministry of Transportation is known legally as ''the King's Highway'', with individual highways referred to as "that part of the King's Highway known as No. xx," or simply "the King's Highway known as No. xx." However, while the legal definition of term includes secondary highways, tertiary roads, and 7000-series highways, those routes are not considered to be King's Highways in the more traditional sense.
Also, in Southern Ontario and in the city of Greater Sudbury there are systems of regional, municipal or county roads which are also numbered. These roads, however, are maintained by the local government, not by the province.
- Ontario Provincial Highway 2 - Tyendinaga Indian Reserve at Ontario Provincial Highway 49 and Hastings County Highway 2 to Marysville, Ontario at Ontario Provincial Highway 49 and Hastings County Highway 2
- Ontario Provincial Highway 3 - Windsor at the Ambassador Bridge over the Detroit River at the USA - Canada border to Junction Ontario Provincial Highway 77 and Essex County Highway 33 north of Leamington ; and Junction Ontario Provincial Highway 4 and Elgin County Highway 4, and Elgin County Highway 3 at Talbotville Royal northwest of St. Thomas to Junction Cement Rd. and Niagara Regional Highway 3 west of Port Colborne ; and Junction Ontario Provincial Highway 140 and Niagara Regional Highway 3 at Port Colborne to Junction Rose Hill Rd. and Niagara Regional Highway 3 west of Fort Erie
- Ontario Provincial Highway 4 - St. Thomas to Clinton
- Ontario Provincial Highway 5 - Peters Corners to Clappison's Corners
- Ontario Provincial Highway 6 - Port Dover to Espanola , connects to the Trans-Canada Highway via ferry, from Tobermory to South Baymouth .
- Ontario Provincial Highway 7 - Highway 4 at Lucan to Highway 410 /Heart Lake Road in Brampton ; from Durham Regional Road 1 (Brock Road) in Pickering to Highway 7A near Peterborough ; and from Highway 115 in Peterborough to Highway 417 in Kanata
- Ontario Provincial Highway 7A - Manchester (west of Port Perry) to Peterborough .
- Ontario Provincial Highway 8 - Peters Corners to Cambridge , and Kitchener to Goderich .
- Ontario Provincial Highway 9 - Kincardine to Harriston and from Orangeville to Davis Drive Interchange, near Pottageville .
- Ontario Provincial Highway 10 - Brampton to Owen Sound .
- Ontario Provincial Highway 11 - Yonge Street , NE of Barrie to Rainy River , it's the Trans-Canada Highway from North Bay west.
- Ontario Provincial Highway 12 - Brooklin to Midland .
- Ontario Provincial Highway 15 - Kingston to Carleton Place
- Ontario Provincial Highway 16 - Highway 416 to Johnstown where it connects to a bridge to Ogdensburg, New York .
- Ontario Provincial Highway 17 - Arnprior west to the Manitoba Border west of Kenora , the Trans-Canada Highway .
- Ontario Provincial Highway 19 - Tillsonburg to Ingersoll
- Ontario Provincial Highway 20 - Allanburg to Niagara Falls
- Ontario Provincial Highway 21 - Highway #402 near Forest to Owen Sound .
- Ontario Provincial Highway 23 - Lucan to Harriston
- Ontario Provincial Highway 24 - Simcoe to south of Cambridge , known as King George Road, Fariveiw Rd. and Tolgate Rd. in Brantford .
- Ontario Provincial Highway 26 - Owen Sound to Bayfield Street in Barrie .
- Ontario Provincial Highway 27 - Only 1.5km left exists within the interchange between Highway 427 and the Queen Elizabeth Way
- Ontario Provincial Highway 28 - east of Peterborough to Highway 41 near Denbigh.
- Ontario Provincial Highway 33 - Bloomfield to Kingston
- Ontario Provincial Highway 34 - Highway 417 to Hawkesbury .
- Ontario Provincial Highway 35 - Macdonald-Cartier Freeway (former Bowmanville-Clarke line) to the Haliburton area.
- Ontario Provincial Highway 37 - Belleville to Actinolite
- Ontario Provincial Highway 40 - Chatham to Sarnia
- Ontario Provincial Highway 41 - Kaladar to Pembroke
- Ontario Provincial Highway 48 - Markham Road in Markham, Ontario to ON-12 east of Beaverton, Ontario .
- Ontario Provincial Highway 49 - North of Marysville to the Quinte Skyway.
- Ontario Provincial Highway 58 - Thorold junction, St. David's Road Interchange, to Lundy's Lane in Niagara Falls .
- Ontario Provincial Highway 60 - Huntsville to Renfrew
- Ontario Provincial Highway 61 - continuation of former '' US 61 '' (now Minnesota State Highway 61 ), Minnesota boundary to Thunder Bay .
- Ontario Provincial Highway 62 - Bloomfield, Ontario to Highway 60 in Barry's Bay .
- Ontario Provincial Highway 63 - North Bay to Quebec boundary.
- Ontario Provincial Highway 64 - Alban to Marten River
- Ontario Provincial Highway 65 - Matachewan to Quebec boundary.
- to Kirkland Lake western city limits, and from Kirkland Lake eastern city limits to the Quebec border.
- Ontario Provincial Highway 67 - ON-101, E of Timmins to Iroquois Falls .
- Ontario Provincial Highway 69 - originally north of Coldwater , now extends from Parry Sound to the Trans-Canada Highway near Sudbury.
- Ontario Provincial Highway 71 - International Falls to Kenora , part of the Trans-Canada Highway
- Ontario Provincial Highway 72 - Dinorwic to Sioux Lookout
- Ontario Provincial Highway 77 - Leamington to Comber
- Ontario Provincial Highway 85 - Highway 7 in Kitchener to the northern limit of Waterloo Regional Municipality
- Ontario Provincial Highway 89 - Harriston to Cookstown
- Ontario Provincial Highway 93 - Hillsdale to Midland
- Ontario Provincial Highway 94 - Wisawasa to Corbeil
- Ontario Provincial Highway 101 - Wawa to the Ontario-Quebec Border north of New Liskeard
- Ontario Provincial Highway 102 - Trans-Canada Highway to Thunder Bay
- Ontario Provincial Highway 105 - Vermillion Bay to Red Lake
- Ontario Provincial Highway 108 - Serpent River to Elliot Lake
- Ontario Provincial Highway 112 - Highway 11 to Kirkland Lake
- Ontario Provincial Highway 115 - Macdonald-Cartier Freeway (former Bowmanville-Clarke boundary) to east of Peterborough .
- Ontario Provincial Highway 118 - Muskoka Falls to Paudash
- Ontario Provincial Highway 124 - Parry Sound to Sundridge
- Ontario Provincial Highway 125 - Red Lake to Balmertown .
- Ontario Provincial Highway 127 - Maynooth to Whitney
- Ontario Provincial Highway 128 - Kenora to Redditt ; now Ontario Provincial Highway 658 .
- Ontario Provincial Highway 129 - Thessalon to Chapleau
- Ontario Provincial Highway 130
- Ontario Provincial Highway 132 - Dacre to Renfrew
- Ontario Provincial Highway 137 - unsigned highway connection Highway 401 to Interstate 81
- Ontario Provincial Highway 138 - Cornwall to Highway 417.
- Ontario Provincial Highway 140 - 11.8 km (7.3 miles) in length connecting Highway 3 in Port Colborne to Highway 406 in Welland by means of the Main Street Tunnel .
- Ontario Provincial Highway 141 - Hayes Corners to Utterson
- Ontario Provincial Highway 144 - Sudbury to Timmins
- Ontario Provincial Highway 148 - Pembroke to Quebec border
:There are no highways having the numbers 1 or 13.
- A list of 400-series roads or freeways, which are King's Highways, can be found at 400-Series Highways .
- Ontario Provincial Highway 502 - from Highway 11 near Fort Frances to Highway 17 near Dryden . Formerly in Southern Ontario between Napanee and Marysville in Lennox And Addington County as an alternate route while a portion of Highway 401 was being constructed.
- Ontario Provincial Highway 510 - Highway 520 in Magnetawan to Highway 124
- Ontario Provincial Highway 516 - Highway 72 in Sioux Lookout to Highway 599
- Ontario Provincial Highway 518 - Highway 69 near Parry Sound to Kearney
- Ontario Provincial Highway 519 - Highway 17 north of Wawa to Dubreuilville
- Ontario Provincial Highway 520 - Ardberg to Highway 124 near Dunchurch ; Highway 124 near Magnetawan to Burk's Falls
- Ontario Provincial Highway 522 - Highway 69 near Grundy Lake Provincial Park to Highway 11 in Trout Creek
- Ontario Provincial Highway 523 - Hastings County border to Highway 60 at Madawaska
- Ontario Provincial Highway 524 - Highway 522 near Commanda to Highway 534 near Restoule
- Ontario Provincial Highway 525 - Highway 596 near Minaki to near Whitedog
- Ontario Provincial Highway 526 - Britt to Highway 69
- Ontario Provincial Highway 527 - Highways 11 and 17 near Thunder Bay to Armstrong . Once Provincial Highway 800.
- Ontario Provincial Highway 528 - Highway 64 in French River to the community of Wolseley Bay
- Ontario Provincial Highway 528A - Highway 528 near the community of Wolseley Bay to the Wolseley Bay water body
- Ontario Provincial Highway 529 - Highway 69 near Pointe Au Baril Station to Highway 69 near Byng Inlet and Britt
- Ontario Provincial Highway 529A - Bayfield Inlet to Highway 529
- Ontario Provincial Highway 531 - Bonfield to Highway 17
- Ontario Provincial Highway 532 - Searchmont northward for a few kilometers
- Ontario Provincial Highway 533
- Ontario Provincial Highway 534
- Ontario Provincial Highway 535
- Ontario Provincial Highway 537
- Ontario Provincial Highway 538
- Ontario Provincial Highway 539
- Ontario Provincial Highway 539A
- Ontario Provincial Highway 540
- Ontario Provincial Highway 540A
- Ontario Provincial Highway 540B
- Ontario Provincial Highway 542
- Ontario Provincial Highway 542A
- Ontario Provincial Highway 546
- Ontario Provincial Highway 547
- Ontario Provincial Highway 548
- Ontario Provincial Highway 550 , Sault Ste. Marie to shore of Whitefish Bay at Gros Cap
- Ontario Provincial Highway 551
- Ontario Provincial Highway 552 , originally part of Ontario Hwy 17 , runs from Ontario Hwy 556 to Goulais River .
- Ontario Provincial Highway 553 - The town of Massey, Ontario to Ontario Provincial Highway 810
- Ontario Provincial Highway 554
- Ontario Provincial Highway 555
- Ontario Provincial Highway 556 , originally part of Ontario Provincial Highway 17 from Heyden to Ont. Hwy 552.
- Ontario Provincial Highway 557
- Ontario Provincial Highway 558
- Ontario Provincial Highway 559
- Ontario Provincial Highway 560
- Ontario Provincial Highway 560A
- Ontario Provincial Highway 562
- Ontario Provincial Highway 563
- Ontario Provincial Highway 564
- Ontario Provincial Highway 565 , from Ontario Hwy 550 to mouth of St. Mary's River .
- Ontario Provincial Highway 566
- Ontario Provincial Highway 567
- Ontario Provincial Highway 568
- Ontario Provincial Highway 569
- Ontario Provincial Highway 570
- Ontario Provincial Highway 571
- Ontario Provincial Highway 572
- Ontario Provincial Highway 573
- Ontario Provincial Highway 574
- Ontario Provincial Highway 575
- Ontario Provincial Highway 576
- Ontario Provincial Highway 577
- Ontario Provincial Highway 579
- Ontario Provincial Highway 580
- Ontario Provincial Highway 581
- Ontario Provincial Highway 582 , loops around Ontario Hwy 11/17 through Hurkett .
- Ontario Provincial Highway 583
- Ontario Provincial Highway 584
- Ontario Provincial Highway 585 , Ontario Hwy 17 near Nipigon northward 36 kilometers.
- Ontario Provincial Highway 586
- Ontario Provincial Highway 587 , from Ontario Hwy 17/11 northwest of Pass Lake to Sleeping Giant (Sibley).
- Ontario Provincial Highway 588
- Ontario Provincial Highway 589
- Ontario Provincial Highway 590
- Ontario Provincial Highway 591
- Ontario Provincial Highway 592
- Ontario Provincial Highway 593 , originally part of Ontario Hwy 61.
- Ontario Provincial Highway 594
- Ontario Provincial Highway 595
- Ontario Provincial Highway 596
- Ontario Provincial Highway 597
- Ontario Provincial Highway 599 , from Ontario Provincial Highway 17 near Ignace to Sioux Lookout .
- Ontario Provincial Highway 600
- Ontario Provincial Highway 601
- Ontario Provincial Highway 602 , from Ont. Hwy 11 west of Fort Frances to Ont. Hwy 11 at Emo .
- Ontario Provincial Highway 603
- Ontario Provincial Highway 604
- Ontario Provincial Highway 605
- Ontario Provincial Highway 607
- Ontario Provincial Highway 607A
- Ontario Provincial Highway 608 , from Ontario Hwy 61 to South Gillies .
- Ontario Provincial Highway 609
- Ontario Provincial Highway 611
- Ontario Provincial Highway 612
- Ontario Provincial Highway 613
- Ontario Provincial Highway 614 , Ontario Hwy 17 to Manitouwadge .
- Ontario Provincial Highway 615
- Ontario Provincial Highway 616
- Ontario Provincial Highway 617
- Ontario Provincial Highway 618 , from Ontario Hwy 105 to Madsen .
- Ontario Provincial Highway 619
- Ontario Provincial Highway 621
- Ontario Provincial Highway 622
- Ontario Provincial Highway 623
- Ontario Provincial Highway 624
- Ontario Provincial Highway 625
- Ontario Provincial Highway 626
- Ontario Provincial Highway 627 , Ontario Hwy 17 north of Heron Bay to Pic River .
- Ontario Provincial Highway 628 , Ontario Hwy 11/17 to Red Rock .
- Ontario Provincial Highway 630
- Ontario Provincial Highway 631 , runs from Ontario Provincial Highway 17 at White River , through Hornepayne , to Ontario Provincial Highway 11 at Hearst .
- Ontario Provincial Highway 632
- Ontario Provincial Highway 633
- Ontario Provincial Highway 634
- Ontario Provincial Highway 636
- Ontario Provincial Highway 637
- Ontario Provincial Highway 638 , Goes through the mountainous terrain of northern Ontario. It starts ( Bruce Mines ) and ends ( Echo Bay ) at Highway 17 (i.e. looping it).
- Ontario Provincial Highway 639
- Ontario Provincial Highway 640
- Ontario Provincial Highway 641
- Ontario Provincial Highway 642
- Ontario Provincial Highway 643
- Ontario Provincial Highway 644
- Ontario Provincial Highway 645
- Ontario Provincial Highway 647
- Ontario Provincial Highway 650
- Ontario Provincial Highway 651
- Ontario Provincial Highway 652
- Ontario Provincial Highway 653 , now County Rd. 653.
- Ontario Provincial Highway 654
- Ontario Provincial Highway 655
- Ontario Provincial Highway 656
- Ontario Provincial Highway 657
- Ontario Provincial Highway 658 . Kenora, Ontario . Highway 17 north to Redditt . Formerly 128 , then 666 . Changed in 1985 after complaints from a Pentecostal Church located on highway.
- Ontario Provincial Highway 661
- Ontario Provincial Highway 663
- Ontario Provincial Highway 664
- Ontario Provincial Highway 665
- Ontario Provincial Highway 667
- Ontario Provincial Highway 668
- Ontario Provincial Highway 670 , Rock Lake to Dunns Valley .
- Ontario Provincial Highway 671
- Ontario Provincial Highway 672
- Ontario Provincial Highway 673
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 eliminated, while others were shortened considerably ( Highway 2 , once stretching across Southern Ontario, now is only a few kilometres long). Below is a partial list of partially or wholly defunct highways since 1997.
- , Windsor to the Ontario-Quebec boundary, now Lake Shore Boulevard , Kingston Road , Toronto Road, and Loyalist Road. A 4.4 kilometre section near Gananoque remains.
- , Scarborough, Ontario . Was once an expressway in the 1940's until highway 401 took over its current route in 1952.
- , between St. Thomas and Leamington .
- , Toronto ; Gardiner Expressway / Lake Shore Boulevard to Macdonald-Cartier Freeway (ON-401) now known only as, York Street then University Avenue , Avenue Road , and Oriole Parkway.
- , Cobalt - New Liskeard .
- , Marmora to Highway 62 near Foxboro.
- , QEW Exit 88 E of Hamilton to QEW/ON-420 interchange, now Confederation Parkway, through Stoney Creek , Rymal Road, and Lundy's Lane .
- , London, Ontario to near Warwick, Ontario , connecting to Sarnia, Ontario and to Arkona by Highway 7; replaced by most of routing of Highway 402
- , 2 km south of Cambridge and northward through Guelph , Orangeville , Shelburne , and Collingwood on Georgian Bay .
- , ( Oakville (Bronte, suburban Toronto) to north of Grand Valley ) now Bronte Road (south of Steeles Avenue in Milton ).
- , Etobicoke, Ontario to Midhurst, Ontario ; now referred to as Highway 27 in Toronto and York Regional Road 27 in Vaughan
- , Port Hope to ON-7A, (which had a joint with ON-115 for 13 km to the Parkway exit), up to NE of Lakefield, at ON-134.
- , Brockville to Arnprior
- , Brighton to Havelock
- , Morrisburg to Ottawa
- , Gananoque to Seeley's Bay
- , Lindsay to Highway 28 at Burleigh Falls.
- , Kingston to highway 7 near Sharbot Lake.
- , Windsor to south of Belle River.
- , Westport to Forthton .
- , Perth to Alexandria , via Smiths Falls , and Winchester decommissioned in 1998--Perth to Smith Falls was Highway 15 prior to completion of Highway 7 in 1950s.
- , Cobourg to Norwood .
- , from Ontario Hwy 7 to Victoria County Rd. 48 near Bolsover . Now Victoria County Rd. 46.
- , Highway 48 north of Stouffville to highways 7 & 12 south of Greenbank.
- , Toronto section; also referred to as Albion Road to highway 89 west of Alliston .
- , North of Cataract to Caledon .
- , East of Alberton to Highway 8 at Peters Corners.
- , Stoney Creek to Eastwood.
- , Highway 3 west of Canfield to Stoney Creek .
- , became Highway 6 on Manitoulin Island .
- , renamed Highway 6 from Hepworth to Springmount.
- , Port Bruce, Ontario to Dorchester, Ontario
- , New Sarum to Nilestown . Decomissioned in 1997 .
- , Highway 27 junction at Bond Head to Highway 11 junction in Bradford . Existed from 1938 to 1988
- , Barrie to Angus and C.F.B. Borden .
- , Wolfe Island
- , Wolfe Island
- , Freelton to Hickson, through Galt/Cambridge .
- , Essex County in the 1950's and 1960's. It was decomissioned, 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 .
- , '''Governor's Road''' (original alignment of Dundas Street from Highway 24 North of Brantford to Ancaster
- , MCF (ON-401) at exit 194 to Former ON-2, eastern part of London , now Airport Road.
- , Highway 400 and 12 to Highway 69 junction, first Highway 69, now Highway 400 .
- , to Grand Valley from Highway 9, then Highway 25.
- , Highway 11 north of Bracebridge to Dorset.
- , Highway 35 south of Fenelon Falls to Haliburton . Eastward is renamed Highway 118.
- , MCF (ON-401) S of London, Ontario (partially superhighway--Wenige Expressway) to ON-2, some think extended to ON-22 (present Fanshawe Park Road East), now known as '''Highbury Avenue'''. (The part between ON-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.)
- , Renamed Simcoe County Road 27.
- , Renamed Highway 28.
- - Short highway in London , between Highway 401 and former Highways 2 & 4. Now called Exeter Road.
- , Cataract to Orangeville . Formerly Highway 24.
- , Brechin to Foot's Bay via Gravenhurst , shared space with Highway 11 from Washago to Gravenhurst.
- - Used to run from Boulter to Combermere at Highway 62. Downgraded to County Rd. status in Hastings and Renfrew counties.
- , now Ontario Hwy 527 near Thunder Bay to Armstrong.
Also--2B, 2S, 3B, 4A, 5A, 7B, 8A, 11B, 12B, 13, 15A, 16,
17A, 17B, 24A, 35B, 40B, 48B.
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