List of upper-tier municipalities in Ontario

 
Name[13] Municipal
sub-type[6]
2016 Census of Population[12]
Population
(2016)
Population
(2011)
Change Land area
(km²)
Population
density
Bruce[d] County 66,491 64,709 +2.8% 3984.82 16.7/km2
Dufferin County 61,735 56,881 +8.5% 1,486.44 41.5/km2
Durham[e] Regional municipality 645,731 608,031 +6.2% 2521.23 256.1/km2
Elgin[f] County 50,069 49,556 +1.0% 1,845.4 27.1/km2
Essex[g] County 181,530 177,720 +2.1% 1,662.73 109.2/km2
Frontenac[h] County 26,677 26,390 +1.1% 3,336.57 8.0/km2
Grey County 93,830 92,568 +1.4% 4,513.50 20.8/km2
Haliburton County 18,062 17,056 +5.9% 4,076.08 4.4/km2
Halton Regional municipality 548,435 501,674 +9.3% 964.05 568.9/km2
Hastings[i] County 39,628 39,888 −0.7% 5,291.59 7.5/km2
Huron County 59,297 59,100 +0.3% 3,399.27 17.4/km2
Lambton[j] County 123,399 124,623 −1.0% 2,842.94 43.4/km2
Lanark[k] County 59,918 56,689 +5.7% 3,025.98 19.8/km2
Leeds and Grenville[l] United counties 69,819 67,958 +2.7% 3,350.08 20.8/km2
Lennox and Addington County 42,888 41,809 +2.6% 2,839.68 15.1/km2
Middlesex[m] County 71,551 70,796 +1.1% 2,821.02 25.4/km2
Muskoka[n] Regional municipality[c] 60,391 57,807 +4.5% 3,877.38 15.6/km2
Niagara Regional municipality 447,888 431,346 +3.8% 1,854.23 241.5/km2
Northumberland[o] County 85,103 81,657 +4.2% 1,892.56 45.0/km2
Oxford Regional municipality[c] 110,862 105,719 +4.9% 2,039.61 54.4/km2
Peel Regional municipality 1,381,739 1,296,809 +6.5% 1,246.95 1,108.1/km2
Perth[p] County 38,066 37,554 +1.4% 2,177.79 17.5/km2
Peterborough[q] County 55,783