Here is the directory sorted by towns and other municipalities

Addington Highlands

Adelaide Metcalfe

Ajax

Algonquin Highlands

Alnwick/Haldimand

Amherstburg

The Archipelago

Arnprior

Arran-Elderslie

Assiginack

Atikokan

Augusta

Aurora

Aylmer

Bancroft

Bayham

Beckwith

Billings

Black River-Matheson

Blandford-Blenheim

The Blue Mountains

Bluewater

Bracebridge

Bradford West Gwill...

Brighton

Brock

Brockton

Bruce Mines

Burk's Falls

Caledon

Callander

Carleton Place

Central Elgin

Central Frontenac

Central Huron

Centre Wellington

CFB Borden

Champlain

Chapleau

Chatsworth

Clarington

Clearview

Cobalt

Cobourg

Cochrane

Collingwood

Cramahe

Dawn-Euphemia

Deep River

Deseronto

Dutton Dunwich

Dysart et al

East Gwillimbury

Edwardsburgh/Cardinal

Elizabethtown-Kitley

Erin

Fort Erie

Fort Frances

Fowler

Gananoque

Georgian Bluffs

Georgina

Gillies

Goderich

Golding

Gravenhurst

Greater Madawaska

Greenstone

Grimsby

Guelph-Eramosa

Halton Hills

Hamilton

Hanover

Hastings Highlands

Hawkesbury

Head, Clara & Maria

Hearst

Horton

Huntsville

Huron East

Ignace

Ingersoll

Iroquois Falls

Johnson

Kapuskasing

Kenogami Lake

Killaloe, Hagarty...

Killarney

Kincardine

King

Kingsville

Kirkland Lake

La Salle

Lake of Bays

Lakeshore

Lambton Shores

Lanark Highlands

Leamington

Leeds and the...

Limerick

Lincoln

Loyalist

Machin

Madawaska Valley

Madoc

Magnetawan

Malahide

Marathon

Markham

Marmora and Lake

Mattawa

McNab/Braeside

Meaford

Melancthon

Merrickville-Wolford

Michipicoten

Middlesex Centre

Midland

Milton

Minden Hills

Minto

Mississippi Mills

Moosonee

Muskoka Lakes

Napanee

Neebing

New Tecumseth

Newbury

Newmarket

Niagara-On-The-Lake

Nipigon

Nipissing

North Dumfries

North Glengarry

North Grenville

North Huron

North Middlesex

North Perth

The North Shore

Northeastern Manit...

Northern Bruce...

Norwich

Oakville

Oliver Paipoonge

Orangeville

Oro-Medonte

Otonabee...

Papineau-Cameron

Parry Sound

Pelee

Pelham

Penetanguishene

Perth

Perth East

Perth South

Petrolia

Point Edward

Port Hope

Prescott

Puslinch

Rainy River

Ramara

Red Lake

Red Rock

Renfrew

Richmond Hill

Rideau Lakes

St. Clair

St. Marys

Saugeen Shores

Schreiber

Scugog

Seguin

Severn

Shelburne

Shuniah

Sioux Lookout

Smiths Falls

Smith-Ennismore...

South Bruce

South Bruce Peninsula

South Dundas

South Frontenac

South Glengarry

South Huron

South Stormont

South West Oxford

Southgate

Springwater

Stirling-Rawdon

Stone Mills

Strathroy-Caradoc

Tay

Tecumseh

Temagami

Terrace Bay

Thessalon

Thornloe

Tillsonburg

Tiny

Trent Hills

Tweed

Tyendinaga

Uxbridge

Warwick

Wasaga Beach

Wellington North

West Grey

West Nipissing

West Perth

Westport

Whitby

Whitchurch-Stouffville

Whitefish River...

Whitewater Region

Wilmot

Woolwich

Zorra

Here is the directory sorted by counties, districts and regions.

Here is the directory sorted by cities.

If the Ontario county, district, region, city, town, township, municipality or village you are searching for does not appear in either of these three directories, then it does not have any Ontario Historical Plaques.