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- O.P.P.: A Rich Heritage
- Oakland / Proudfoot, London Township, Middlesex County
- Oban Cemetery, Plympton Township, Lambton County
- Obituary Daily Times
- Obituary Depot
- Odd Fellows History In Ontario
- Oddfellows Mailing List
- Official Road Map of Ontario
- Official Web Site of the City of Toronto
- Ogletree / Ogiltree, Kent County
- Ojibwe.info
- Old Delmer Cemetery, Dereham Township, Oxford County
- Old Lakeview Cemetery, Thorold Township, Welland County
- Old Methodist / St Paul's United, Drummond Township, Lanark County
- Old Methodist / St Paul's United, Drummond Township, Lanark County
- Old Methodist Cemetery, Kemptville, Grenville County
- Old Orono Cemetery, Clarke Township, Durham County
- Old Richmond Cemetery, Bayham Township, Elgin County
- Old-Handwriting Introduction
- Olde Private Burying Site, Bathurst Township, Lanark County
- Olde Private Burying Site, Bathurst Township, Lanark County
- Oldfield Methodist Cemetery, Kent County
- Olinda Baptist Cemetery, Essex County
- Olinda United Church Cemetery, Essex County
- Olive Tree Genealogy
- Ompah Cemetery, Palmerston Township, Frontenac County
- Ompah Cemetery, Palmerston Township, Frontenac County
- ONDURHAM
- One-Stop Beginner's Genealogy
- Online adoption search and reunion resources
- ONT-HURON-DISTRICT
- ONT-LEEDS-GRENVILLE
- ONT-STORMONT-DUNDAS-GLENGARRY
- Ontario - Michigan Migration
- Ontario and Nova Scotia Census, 1800-1842 (Ancestry.ca)
- Ontario Association of Cemetery and Funeral Professionals
- Ontario Black History Society Archives
- Ontario Business Directory
- Ontario Cemeteries Resources
- Ontario Cemetery Finding Aid (OCFA)
- Ontario Cities Online
- Ontario City & Farmers Directories
- Ontario County GenWeb
- Ontario Court Addresses
- Ontario Court of Probate and Surrogate Court Records: Wills and Estate Files - A Pathfinder (Archives of Ontario)
- Ontario Directory for 1851: Ancaster
- Ontario Directory for 1851: Flamboro West
- Ontario Directory of 1851: Mount Pleasant
- Ontario Directory of 1851: Paris
- Ontario French Catholic Church Records (Drouin Collection), 1747-1967
- Ontario Funeral Homes
- Ontario Funeral Homes listed on Funeralnet.com
- Ontario Funeral Service Association
- Ontario Genealogical Society
- Ontario Genealogical Society Maps For Sale
- Ontario Genealogical Society Provincial Index
- Ontario genealogy mailing list
- Ontario Genealogy Society's Ontario Cemetery Locator
- Ontario Genealogy: Medical Records
- Ontario Government: Births, Deaths & Marriages
- Ontario Historical Society
- Ontario History Quest
- Ontario Jewish Archives
- Ontario Land & Property Research - A Guide
- Ontario Locator
- Ontario Mailing Lists
- Ontario Mailing Lists, Newsgroups and Chats
- Ontario Map
- Ontario Map
- Ontario MapArt Street Maps
- Ontario Marriages
- Ontario Members of Provincial Parliament
- Ontario Museum Association
- Ontario Obits
- Ontario Research Outline compiled by the LDS Family History Center. A great resource for finding out what the LDS has to offer for Ontario researchers worldwide
- Ontario Resources
- Ontario School Records Mailing List
- Ontario Vital Statistics Bulletin (Archives of Ontario)
- Ontario's Mennonite Heritage
- Ontario's Plaques Photographing Ontario's Historical Plaques
- Ontario's Underground Railroad
- Ontario, Canada Births, 1869-1909 (Ancestry.ca)
- Ontario, Canada Census Index, 1871 free index (Ancestry.ca)
- Ontario, Canada Deaths, 1869-1934 (Ancestry.ca)
- Ontario, Canada Marriages, 1857-1924 (Ancestry.ca)
- Ontario, Canada Obituaries, 1999-2001: Kitchener Record and Windsor Star (Ancestry.ca)
- Ontario, Canada Voter Lists, 1867-1900
- Ontario, Canada: Civil Marriage Registrations, 1869-73 (Ancestry.ca)
- Ontario, Canada: Roman Catholic Marriages, 1827-1870 (Ancestry.ca)
- OntarioGenWeb Archives
- OntarioGenWeb's Census Project
- Orange Valley Presbyterian Cemetery, Artemesia Township, Grey County
- Orangeville Banner
- Order of the Eastern Star Mailing List
- Orders-in-Council, 1867-1882
- Oriel Pioneer Cemetery, East Oxford Township, Oxford County
- Oriel Sideroad / Zion, East Oxford Township, Oxford County
- Oro Station United Church / Oro Mission / Little Brick United, Oro Township, Simcoe County
- Orono Cemetery, Clarke Township, Durham County
- Orwell Cemetery, Elgin County
- Ossian / Postill / Fisher, Lambton County
- Otonabee Township Genealogy
- Ottawa Citizen OnLine
- Ottawa Sun
- Otterville Cemetery, South Norwich Township, Oxford County
- Our Begats: The Ancestries of John & Linda Monkman (nee Austin)
- Our Family Lines Scottish immigrants to Ontario c. 1905. Old photos of the immigrants.
- Our Lady of Lourdes Cemetery, Essex County
- Our Lady of The Assumption Catholic Church Cemetery, Sunnidale Township, Simcoe County
- Our Lady Of The Lake Cemetery, Essex County
- Our Ontario
- Our Roots: Books Online
- Our Tree of Life: Gallagher, Gallaher, Bonn, Campbell, Smith Genealogy
- OVS Project
- Owen Cemetery, Kent County
- Oxford Centre United Cemetery, East Oxford Township, Oxford County
- Oxford County GenWeb
- Oxford County Library Databases & Indexes
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