RANKING · 2020 CENSUS · 57 SHOWN OF 57

Most population lost, Connecticut cities · 2020

Connecticut cities that lost the most residents from the 2010 census to 2020, by raw count of people rather than percentage. This list covers the 57 cities in Connecticut that qualify, ranked against each other statewide. The median across all 57 is +207.

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SAME RANKING BYCounties States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population gained Most densely populated Most sparsely populated

YEAR2000 2010 2020 2024

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Hartford, CTCT121,981-3,721−80%

02East Haven, CTCT27,806-1,334−165%

03Groton, CTCT10,160-1,002−679%

04Torrington, CTCT35,796-868−157%

05Milford, CTCT51,215-713–

06Derby, CTCT12,925-577−401%

07Winsted, CTCT6,977-520−44%

08Norwich, CTCT40,001-368−71%

09Naugatuck, CTCT32,230-343−194%

10Ansonia, CTCT19,216-331−319%

11New London, CTCT28,003-253−91%

12East Hartford, CTCT50,918-207−76%

13Pawcatuck, CTCT5,577-191−203%

14Terryville, CTCT5,461-185+180%

15Putnam, CTCT7,120-149–

16Thompsonville, CTCT7,927-63−81%

17Ridgefield, CTCT6,970-49−106%

18Portland, CTCT5,944-49−56%

19Sherwood Manor, CTCT5,706-38−94%

20Newington, CTCT30,896-26−127%

21Meriden, CTCT60,810-18−99%

22West Haven, CTCT55,351+20−101%

23Conning Towers-Nautilus Park, CTCT8,460+36−84%

24Wallingford Center, CTCT18,208+69−122%

25Middletown, CTCT48,439+69−83%

26Cos Cob, CTCT7,546+103–

27Windsor Locks, CTCT12,579+115−137%

28North Haven, CTCT24,336+160−80%

29Branford Center, CTCT6,305+207+340%

30Southwood Acres, CTCT8,115+222−125%

31Orange, CTCT14,315+324−20%

32Old Greenwich, CTCT6,936+351–

33Bristol, CTCT62,341+356−162%

34Willimantic, CTCT18,096+412–

35Riverside, CTCT8,954+427–

36Simsbury Center, CTCT6,198+432−10900%

37Rockville, CTCT7,072+446–

38Oakville, CTCT9,276+457−472%

39Wethersfield, CTCT27,250+630+2%

40Storrs, CTCT15,207+635−153%

41New Milford, CTCT8,188+637−26%

42Cheshire, CTCT6,172+713+2277%

43West Hartford, CTCT63,620+815−77%

44Greenwich, CTCT14,792+894–

45New Britain, CTCT76,286+929−124%

46Glastonbury Center, CTCT7,266+1,072+1329%

47Shelton, CTCT42,880+1,310−51%

48Kensington, CTCT9,962+1,503+540%

49Bethel, CTCT11,404+2,033+573%

50Hazardville, CTCT6,022+2,271−914%

51Waterbury, CTCT115,771+4,037−339%

52New Haven, CTCT138,774+4,244−162%

53Bridgeport, CTCT152,273+4,425−305%

54Norwalk, CTCT94,508+5,581+21%

55Danbury, CTCT89,033+5,625−39%

56Manchester, CTCT36,759+5,802–

57Stamford, CTCT139,535+12,827+42%

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS