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. Links are organized below, with Help Resources included on the right.

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). More information about the data used in these sites can be found here.
  1. OnCOR
  2. Staff Sites
  3. Other Apps
  4. Help
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.
OnCOR Light App
OnCOR "Light" Property App
 Want a simpler approach? This OnCOR "Light" app pares down the tools to help new (and even veteran) users dive in quickly without feeling overwhelmed by the full site.

Over time, we may introduce a second tab in the toolbar for "advanced stuff" to bridge the gap in functionality. Stay tuned!

NOTE!: The County's older Silverlight-based Oncor Site can still be accessed using Internet Explorer, but please be aware that this site will be officially phased out on in the near future 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).