N.Y. County Law § 404

§ 404. Official seals. The official seals of boards of supervisors of\nthe several counties, county seal, county treasurer's seal and the seal\nof the register of deeds shall continue to be the official seals,\nrespectively, of such boards, county treasurer, surrogate and register\nof deeds and used as such, respectively, when authorized by law. When\nany such seal shall be lost, destroyed, or become unfit for use, the\nboard of supervisors of the county interested therein or not having such\nseal, shall cause a new seal or seals to be made at the expense of the\ncounty. A description of each of such seals, together with the\nimpressions therefrom, shall be filed in the office of the county clerk\nand in the office of the secretary of state. In counties having two\ncounty seats, a duplicate of the county seal shall be procured and kept\nat the county seat where the county clerk's office is not situated, at\nsome place to be designated by the county clerk and may be used by him\nthe same as at his office. In counties having but one court house and\nwhich is located more than five miles from the county clerk's office, a\nduplicate of the county seal shall be procured and kept at such court\nhouse and the county clerk may use the same at such court house. The\nseal kept by the county clerk in each county, as prescribed in the\njudiciary law, shall continue to be the seal of the county, and must be\nused by him where he is required to use an official seal.\n