New York State Senate, County-based borders. (Format: County[ies]; Population; Number of Members)
Kings; 2,504,700; 8
Queens; 2,230,722; 7
New; York; 1,585,873; 5
Suffolk; 1,493,350; 5
Bronx; 1,385,108; 5
Nassau; 1,339,532; 4
Westchester; 949,113; 3
Erie; 919,040; 3
Monroe; 744,344; 2
Richmond; 468,730; 2
Onondaga; 467,026; 2
Dutchess-Putnam; 397,198; 1
Saratoga-Schenectady; 374,334; 1
Orange; 372,813; 1
Genesee-Niagara-Orleans; 319,431; 1
Broome-Chenango-Otsego; 313,336; 1
Rockland; 311,687; 1
Madison-Oneida; 308,320; 1
Delaware-Sullivan-Ulster; 308,020; 1
Allegany-Cattaraugus-Chautauqua-Wyoming; 306,323; 1
Columbia-Greene-Rensselaer-Schoharie; 304,495; 1
Albany; 304,204; 1
Warren-Herkimer-Washington-Fulton-Montgomery-Hamilton; 304,028; 1
Livingston-Ontario-Steuben-Yates; 297,662; 1
St. Lawrence-Clinton-Franklin-Essex; 285,041; 1
Jefferson-Lewis-Oswego; 265,425; 1
Chemung-Schuyler-Tioga-Tompkins; 259,862; 1
Cayuga-Cortland-Seneca-Wayne; 258,385; 1
TOTAL; 19,378,102; 63