N.Y. County Law § 255

§ 255. Representation by municipalities and district. At the public\nhearing on the establishment of a county district which includes the\nwhole or any part of a city, village or such district furnishing a\nsimilar service as the proposed district, the inhabitants of such city,\nvillage or district may be represented jointly by an officer or official\nof the municipality or district duly designated by the governing body of\nthe municipality or district to attend.\n