This dataset contains four files containing data from the Ontario Ministry of Natural Resources and Forestry shared with the Cornell Wildlife Health Lab (CWHL) at Cornell University for the purpose of the Surveillance Optimization Project for Chronic Wasting Disease (SOP4CWD). Professionals at the source facility have provided written permission for professionals at the CWHL to post this open data to this persistent eCommons repository. OMNRF_WTD_surveillance_2020.csv: This datafile constitutes records in standardized form depicting the results of chronic wasting disease (CWD) testing of white-tailed deer (Odocoileus virginianus) in Ontario, Canada for hunting seasons from 2017-18 to 2019-20, as completed by wildlife health diagnosticians at (or in partnership with) the Ontario Ministry of Natural Resources and Forestry. OMNRF_WTD_harvest_2020.csv: This data constitutes the estimated total number of white-tailed deer (Odocoileus virginianus) legally harvested by hunters by county in Ontario, Canada for hunting seasons from 2017-18 to 2019-20, as recorded by the Ontario Ministry of Natural Resources and Forestry. OMNRF_processors_2020.csv: This data constitutes the estimated total number taxidermists and cervid meat processors by county in Ontario, Canada for hunting season 2019-20, as recorded by the Ontario Ministry of Natural Resources and Forestry. OMNRF_cervid_facilities_2020.csv: This data constitutes the estimated total number of captive cervid facilities by county in Ontario, Canada for the year 2020, as recorded by the Ontario Ministry of Natural Resources and Forestry.