RANKING · 2020 CENSUS · 57 SHOWN OF 57

Most population gained, Connecticut cities · 2020

Connecticut cities that added 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.

Flip the list · Most population lost, US cities →

ConnecticutAll statesPop > 5KAll rankings

SAME RANKING BYCounties States Metros

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

YEAR2000 2010 2020 2024

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Stamford, CTCT139,535+12,827+42%

02Manchester, CTCT36,759+5,802–

03Danbury, CTCT89,033+5,625−39%

04Norwalk, CTCT94,508+5,581+21%

05Bridgeport, CTCT152,273+4,425−305%

06New Haven, CTCT138,774+4,244−162%

07Waterbury, CTCT115,771+4,037−339%

08Hazardville, CTCT6,022+2,271−914%

09Bethel, CTCT11,404+2,033+573%

10Kensington, CTCT9,962+1,503+540%

11Shelton, CTCT42,880+1,310−51%

12Glastonbury Center, CTCT7,266+1,072+1329%

13New Britain, CTCT76,286+929−124%

14Greenwich, CTCT14,792+894–

15West Hartford, CTCT63,620+815−77%

16Cheshire, CTCT6,172+713+2277%

17New Milford, CTCT8,188+637−26%

18Storrs, CTCT15,207+635−153%

19Wethersfield, CTCT27,250+630+2%

20Oakville, CTCT9,276+457−472%

21Rockville, CTCT7,072+446–

22Simsbury Center, CTCT6,198+432−10900%

23Riverside, CTCT8,954+427–

24Willimantic, CTCT18,096+412–

25Bristol, CTCT62,341+356−162%

26Old Greenwich, CTCT6,936+351–

27Orange, CTCT14,315+324−20%

28Southwood Acres, CTCT8,115+222−125%

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

30North Haven, CTCT24,336+160−80%

31Windsor Locks, CTCT12,579+115−137%

32Cos Cob, CTCT7,546+103–

33Wallingford Center, CTCT18,208+69−122%

34Middletown, CTCT48,439+69−83%

35Conning Towers-Nautilus Park, CTCT8,460+36−84%

36West Haven, CTCT55,351+20−101%

37Meriden, CTCT60,810-18−99%

38Newington, CTCT30,896-26−127%

39Sherwood Manor, CTCT5,706-38−94%

40Ridgefield, CTCT6,970-49−106%

41Portland, CTCT5,944-49−56%

42Thompsonville, CTCT7,927-63−81%

43Putnam, CTCT7,120-149–

44Terryville, CTCT5,461-185+180%

45Pawcatuck, CTCT5,577-191−203%

46East Hartford, CTCT50,918-207−76%

47New London, CTCT28,003-253−91%

48Ansonia, CTCT19,216-331−319%

49Naugatuck, CTCT32,230-343−194%

50Norwich, CTCT40,001-368−71%

51Winsted, CTCT6,977-520−44%

52Derby, CTCT12,925-577−401%

53Milford, CTCT51,215-713–

54Torrington, CTCT35,796-868−157%

55Groton, CTCT10,160-1,002−679%

56East Haven, CTCT27,806-1,334−165%

57Hartford, CTCT121,981-3,721−80%

SHOWING 1–57 OF 57

Download CSV (full list, 57 rows)

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