Located on County Road 48 in Canandaigua, the Ontario County Emergency Management office serves as a vital component of the county's government. Established in 1789, Ontario County initially encompassed a vast area of western New York State, stretching from the Pre-emption Line to Lake Erie and from Lake Ontario to the Pennsylvania border. The county's history is deeply rooted in the region's early development, with the Hartford Treaty of 1786 and the Buffalo Creek Treaty playing significant roles in shaping its boundaries. The county's early records, including assessment records and historical deeds, are now preserved at the Ontario County Records and Archives Center.

The Ontario County Emergency Management office is part of a larger network of government services, with the county itself having undergone significant changes over the years, subdividing into fourteen separate counties, including Steuben, Genesee, Livingston, and Monroe. Today, the office operates as part of the county's infrastructure, working to support the local community through various initiatives and services. With its rich history and ongoing role in the region, the Ontario County Emergency Management office remains an important presence in the area, serving the needs of residents and providing a connection to the county's fascinating past.