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Table 1 A comparison of postal code population sizes among Montreal, Ottawa, and Toronto.

From: The re-identification risk of Canadians from longitudinal demographics

  Ottawa Montreal Toronto
No. Letters in Postal Code Mean Median Mean Median Mean Median
1 362,211 362,211 1,870,336 1,870,336 699,936 699,936
2 181,106 181,106 267,191 273,240 116,656 88,401
3 16,464 16,368 19,792 19,602 12,498 10,892
4 3,853 4,016 5,616 4,954 3,910 2,286
5 289 220 351 264 324 228
6 40 23 48 30 51 23