Order by population (note: this is a work in progress)

1. Toronto - 4,612,191 https://lemmy.ca/c/toronto

2. Ottawa - 812,129 https://lemmy.ca/c/ottawa

3. Mississauga - 668,549 https://lemmy.ca/c/mississauga

4. North York - 636,000 https://lemmy.ca/c/north_york_ontario

5. Hamilton - 504,559 https://lemmy.ca/c/hamilton

6. Brampton - 433,806 https://lemmy.ca/c/brampton

7. Kitchener - 409,112 https://lemmy.ca/c/kitchener_ontario

8. London - 346,765 https://lemmy.ca/c/london

9. Windsor - 278,013 https://lemmy.ca/c/windsoron

10. Oshawa - 247,989

11. Vaughan - 238,866

12. Barrie - 182,041

13. Oakville - 165,616

14. Burlington - 164,415

15. Greater Sudbury - 157,857 https://lemmy.ca/c/greater_sudbury

16. St. Catharines - 131,989

17. Cambridge - 120,372

18. Guelph - 115,760

19. Kingston - 114,195 https://lemmy.ca/c/kingston_ontario

20. Chatham-Kent - 108,589

21. Thunder Bay - 99,334

22. Waterloo - 97,475 https://lemmy.ca/c/waterloo https://kbin.social/m/Waterloo

23. Pickering - 87,838

24. Brantford - 87,759 https://lemmy.ca/c/brantford

25. Sarnia - 82,998

26. Niagara Falls - 82,000 https://lemmy.ca/c/niagara

27. Peterborough - 75,877

28. Sault Ste. Marie - 74,948

29. Kawartha Lakes - 74,561

30. Norfolk County - 60,847

31. Welland - 50,331

32. North Bay - 50,170

33. Belleville - 48,821 https://lemmy.ca/c/belleville

34. Cornwall - 48,821 https://lemmy.ca/c/cornwallont

35. Haldimand County - 45,212

36. Timmins - 42,997

37. Quinte West - 42,697

38. St. Thomas - 36,110

39. Brant - 34,415

40. Woodstock - 33,892

41. Orangeville - 32,640

42. Midland - 31,502

43. Leamington - 30,428

44. Stratford - 30,233

45. Orillia - 30,178

46. Prince Edward - 25,496

47. Brockville - 23,886 https://lemmy.ca/c/brockville_ontario

48. Owen Sound - 22,625

49. Keswick - 21,000

50. Clarence-Rockland - 20,790

51. Huntsville - 19,579

52. Bradford West Gwillimbury - 18,811

53. Port Colborne - 18,599

54. Thorold - 18,224

55. Cobourg - 18,099

56. Fort Erie - 15,953

57. Collingwood - 15,809

58. Pembroke - 15,551 https://lemmy.ca/c/pembroke

59. Kenora - 15,177

60. Greater Napanee - 15,132

61. Elliot Lake - 12,508

62. Hawkesbury - 12,283

63. Ingersoll - 11,874

64. Amherstburg - 11,459

65. Petawawa - 11,256

66. Paris - 11,177

67. Smiths Falls - 10,553 https://lemmy.ca/c/smiths_falls_ontario

68. Temiskaming Shores - 10,442

69. Angus - 10,269

70. Bells Corners - 9,977

71. Carleton Place - 9,743

72. Arnprior - 9,607

73. Kapuskasing - 9,240

74. Bracebridge - 8,238

75. Dryden - 8,195

76. Goderich - 8,032

77. Renfrew - 8,018

78. Fort Frances - 7,931

79. Kirkland Lake - 7,775

80. Wasaga Beach - 7,567

81. Aylmer - 7,527

82. Camlachie - 7,506

83. Innisfil - 7,345

84. Hanover - 7,255

85. Perth - 6,481 https://lemmy.ca/c/perth_ontario

86. Parry Sound - 6,469

87. Gravenhurst - 5,839

88. Gananoque - 5,458

89. Petrolia - 5,453

90. Hearst - 4,746

91. Espanola - 4,682

92. Marathon - 4,627

93. Prescott - 4,466

94. Shelburne - 4,390

95. Deep River - 4,296

96. Iroquois Falls - 4,232

97. Bancroft - 3,838

98. Atikokan - 3,400

99. Casselman - 3,074

100. Wingham - 2,923