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Ontario County welcomes you to explore OnCOR (Ontario County Online Resources). Please note that the "Desktop" version will be retired in the near future due to Microsoft and mapping software phasing out the Silverlight plugin. You are strongly encouraged to used the "Mobile" version instead that works on all browsers and devices (desktops and smartphones/tablets).
OnCOR Desktop Website OnCOR Mobile Website
In order ensure the most interactive experience, please make sure you are on the latest version of Microsoft Silverlight and are using the Internet Explorer browser. Google CHROME will no longer support Silverlight as of January 2015 and variable in Firefox.

OnCor is a cooperative project between the Ontario County Planning Department, Real Property Tax, Information Services/GIS Program, and the County Clerks Office. The program leverages the resources of these individual departments and delivers them through one common web enabled interface.

This project currently provides integration of County’s Land Record information (assessment data, deeds, surveys, tax bills, aerial photography), and will evolve to address the needs of the Ontario County residents and visitors. You will find many tools for finding information, including dynamic access to other data such as Pictometry, Bing and Google Maps. Look for specialized sites in the near future such as recreation and community-focused applications. The Silverlight Viewer user guide can be found here, and the Mobile Viewer user guide can be found here.

Please note that tax bills are now provided where available, but these are for informational purposes only and are not intended to replace official documents. While assessment information is also shown, users are strongly urged to contact the Ontario County Treasurer's Office (585-396-4432) to verify exact total taxes. If the property is located in the City of Canandaigua or Geneva, please contact the city that the property is located in: City of Canandaigua (585-396-5015), City of Geneva (315-789-2114).

Contact Us
Sheri Norton
GIS Coordinator

70 Ontario Street
Canandaigua, NY 14424
Ph: (585) 396-4500
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