The Provincial Premises Registry (PPR) is the destination for registering parcels of land in Ontario associated with agri-food activities. 

Agri-food business owners and operators, including fairgrounds can register and update their premises in the PPR, online or over the phone, securely, easily and for free.

https://www.ontariopid.com/en-CA/

List of the OAAS Premises Identification Numbers updated Dec, 2017