Ontario County Online Resources (OnCor)

Ontario County welcomes you to explore the next generation OnCOR designed for both desktop/laptop users and mobile devices to address the interests and needs of Ontario County residents and visitors. We will continue to develop a gallery of special sites for you to learn about many aspects of this diverse area of the Finger Lakes region.

The mapping information provided in these sites are a great starting point for research, but be aware these data are intended as a GENERAL REFERENCE and should never replace a site survey by a licensed professional or official documents. If you are uncertain how these data can be used, please contact the local community's staff for recommendations (e.g., Code Enforcement office).

Anyone is welcome to use the apps, but if you would like to save your session as a Project, you will need to use the guest sign-in located in the top right corner of the app:

Username: guest           Password: Guest!

OnCOR App photo and link
OnCor Property App

Interested in property? This app lets you explore tax parcels and associated information (local zoning, surveys, assessment, soils, owner history, with Pictometry, Google Street View, and Bing imagery).
A user guide can be found here to help you get started.
Explore Ontario County!
Explore App
Explore Ontario County! From beautiful lakes, summits, and waterfalls to wine tours, Native American heritage and winter fun, there's something year-round for everyone.
Community Resources App
Community Services App
Need local resources? The Community Services app will help you find them, whether it be daycare, affordable housing, food sites (grocery stores, farmers markers, pantries), and other locations.
Historic Barns App

Love Farming & History?
Come learn about agricultural history through a tour of historic barns! A full inventory began in the Town of Canandaigua, gradually expanding to canvass the remaining communities.
NOTE!: The County's DESKTOP ONLY Oncor Site can still be accessed using Internet Explorer, but please be aware that this site will be officially phased out on June 10th due to discontinued support for Silverlight by Microsoft and the mapping software.

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



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).