OnCOR Data Layers

OnCOR has a wide range of spatial data layers available, some prepared and maintained in-house by County staff while others originating from other organizations. Links to documentation and/or websites for further details are provided in the table below. If you have questions about whether a particular data set is up to date and how it can be appropriately used, please touch base with the respective organization directly.
  1. County
  2. State
  3. Federal
  4. Other
Layer Name
 Source Status
Tax Parcel Boundaries
 Ontario County (Real Property), local Assessors
 Boundaries are updated once a year on March 1st; attributes are updated in sync with the Tentative (May 1st) and Final (July 1st) assessment rolls.
Owner info, surveys, deed reference
 Ontario County (Real Property)
 Continuously updated as deeds and surveys are filed with the County Clerk.
2014 Aerial Photos
 Pictometry, Inc.
 April 2014
2009 Aerial Photos
 Pictometry, Inc. April 2009
Street Centerlines
 Ontario County (GIS Program, Sheriff)
 Continuously Updated
Address Points
 Ontario County (GIS Program, Sheriff)
 Continuously Updated
Building Footprints
 Ontario County (GIS Program)
 Continuously Updated
Zoning Ontario County (Planning), local zoning offices
 Updated As Needed
Municipal & County Boundaries
 Ontario County (Real Property)
2016
Water Bodies
 Ontario County (GIS Program)
 2006
3D Terrain
 Ontario County (GIS Program)
2006
Contours (2', 10', 30')
 Ontario County (GIS Program) 2006
Percent Slopes
Ontario County (GIS Program)
2006
Streams
 Ontario County (GIS Program) 2006
Points of Interest
 Ontario County (GIS Program)
 Updated As Needed
Agricultural Districts
 Ontario County (Planning)
 2014
Ecological Communities
 Ontario County (Planning)
 2016 (Town of Bristol update in 2017) - variable field work updates