RANKING · 2020 CENSUS · 62 SHOWN OF 62

Most population lost, New York counties · 2020

New York counties that lost the most residents from the 2010 census to 2020, by raw count of people rather than percentage. This list covers the 62 counties in New York that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Chautauqua County, NYNY124,126-7,248+238%

02Madison County, NYNY67,120-5,426−1790%

03Steuben County, NYNY91,855-5,406+1393%

04Chemung County, NYNY80,415-4,682+14%

05Oswego County, NYNY118,569-4,584−856%

06Herkimer County, NYNY59,219-4,380+220%

07Franklin County, NYNY46,500-4,044−188%

08Niagara County, NYNY208,912-3,803+318%

09Cayuga County, NYNY74,365-3,778+979%

10Otsego County, NYNY60,589-3,735−422%

11Delaware County, NYNY44,305-3,672−542%

12Livingston County, NYNY61,438-3,559−282%

13St. Lawrence County, NYNY105,488-3,439+7898%

14Cattaraugus County, NYNY75,390-3,275+1074%

15Chenango County, NYNY45,715-3,257+787%

16Schoharie County, NYNY30,176-3,035+996%

17Oneida County, NYNY226,392-2,753−82%

18Tioga County, NYNY47,453-2,670+383%

19Orleans County, NYNY39,825-2,540−209%

20Cortland County, NYNY45,850-2,527+594%

21Allegany County, NYNY46,800-2,490+359%

22Wayne County, NYNY91,250-2,489−154%

23Clinton County, NYNY78,138-2,285−62%

24Fulton County, NYNY52,216-2,207−350%

25Putnam County, NYNY99,028-2,042−117%

26Essex County, NYNY36,438-1,989−217%

27Broome County, NYNY195,736-1,917−84%

28Washington County, NYNY59,353-1,914−212%

29Genesee County, NYNY58,416-1,691−645%

30Wyoming County, NYNY39,741-1,624−277%

31Dutchess County, NYNY300,708-1,577−108%

32Columbia County, NYNY60,168-1,526−1463%

33Seneca County, NYNY32,883-1,437+321%

34Greene County, NYNY47,238-1,290−137%

35Montgomery County, NYNY50,046-687−70%

36Ulster County, NYNY183,330-642−105%

37Yates County, NYNY24,547-574−132%

38Lewis County, NYNY26,479-505−441%

39Schuyler County, NYNY16,924-445−179%

40Warren County, NYNY65,020+30−99%

41Hamilton County, NYNY5,006+271+171%

42Jefferson County, NYNY111,540+492−38%

43Sullivan County, NYNY80,586+1,077−77%

44Rensselaer County, NYNY160,510+1,701−190%

45Schenectady County, NYNY162,581+3,334−222%

46Tompkins County, NYNY104,047+4,176+74%

47Ontario County, NYNY113,130+4,527−12%

48Onondaga County, NYNY466,584+9,490−189%

49Albany County, NYNY321,225+10,644+440%

50Monroe County, NYNY750,506+15,099−29%

51Saratoga County, NYNY241,343+15,902−18%

52Rockland County, NYNY357,397+26,642+25%

53Richmond County, NYNY501,290+27,017−58%

54Orange County, NYNY417,669+28,497−15%

55Suffolk County, NYNY1,546,090+32,570−67%

56Erie County, NYNY946,741+35,196−293%

57Westchester County, NYNY1,015,743+55,344+14%

58Nassau County, NYNY1,398,939+56,242+19%

59Bronx County, NYNY1,406,332+87,546−32%

60New York County, NYNY1,664,862+108,378+118%

61Queens County, NYNY2,358,182+174,742−37%

62Kings County, NYNY2,653,963+231,374+41%

SHOWING 1–62 OF 62

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS