- - Santa's is H0H 0H0, in Canada
- - In Canada, Santa's is H0H 0H0
- - M5V 2T6, for Toronto's CN Tower
- - one way to locate address in most letters — located correctly
- - A communications innovation first used in the UK in Norwich (1959) and Croydon
- - Feature of some letters
- - Letter-routing number
- - Zip
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