Western New York Milk Marketing Area means all territory, including government institutions or reservations, within the Counties of Erie, Genesee, Livingston, Monroe, Niagara, Ontario, Orleans, Seneca, Wayne and Wyoming; the Townships of Freedom and Yorkshire in Cattaraugus County; the Townships of Alfred, Almond, Burns, Centerville, Granger, Grove and Hume in Allegany County; the City of Hornell, and the Townships of Avoca, Bath, Bradford, Canisteo, Cohocton, Dansville, Fremont, Pulteney, Hartsville, Hornellsville, Howard, Prattsburg, Urbana, Wayland, Wayne and Wheeler in Steuben County; the Townships of Conquest, Montezuma, Sterling and Victory in Cayuga County; the Townships of Italy, Middlesex and Potter in Yates County; all located in the State of New York and all hereinafter called the marketing area.