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Ancestry.com > Card Catalog > USA > New York > Ontario $
A list of all databases for this county. Ancestry.com has searchable indexes; database results and some digitized images are available with a fee-based subscription. Free articles and helpful research materials.
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FamilySearch Wiki - Ontario County, New York.
Free online genealogical research guide for Ontario County, New York.
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New York State Unified Court System > Courts in Ontario County
Links to and contact information for all the courts in New York state, and also for each county in New York.