0开头的还是第一次听说。
Geography
The first digit of a SIN indicates the province in which it was registered:
1: Atlantic Provinces: Nova Scotia, New Brunswick, Prince Edward Island, and Newfoundland and Labrador (this may also cover overseas residents).
2-3: Québec
4-5: Ontario (#4 includes overseas forces)
6: Prairie Provinces (Manitoba, Saskatchewan, and Alberta), Northwest Territories, and Nunavut
7: Pacific Region (British Columbia and Yukon)
8: Not used
9: Temporary resident
0: Not used (Canada Revenue may assign fictitious SIN numbers beginning with zero to taxpayers who do not have SINs)
Note: While the first digit usually identifies the location of registration, the government has found it necessary in the past to supply certain regions with SIN numbers assigned to other regions.