N.Y. County Law § 2

§ 2. Application of chapter. This chapter shall apply to all counties,\nexcept that:\n (a) It shall not apply to a county wholly contained within a city,\nunless specifically so provided;\n (b) The provisions of this chapter in so far as they are in conflict\nwith or in limitation of a provision of any alternative form of county\ngovernment heretofore or hereafter adopted by a county pursuant to\nsection two of article nine of the constitution, or any administrative\ncode, county government law or civil divisions act enacted by the\nlegislature and applicable to such county as now in force or hereafter\namended, or in conflict with any local law heretofore or hereafter\nadopted by a county under an optional or alternative form of county\ngovernment, shall not be applicable to the county, unless a contrary\nintent is expressly stated in this chapter.\n