1xx Series SIN (Atlantic and Ontario region)
Social Insurance Number applicants in Ontario might have noticed their SIN start with the number 1 series, which is the same as for people living in the Atlantic region. Social Insurance office started to roll out SIN that starts with 1 series for people who applied for their SIN in Ontario region in the fall 2021. This move seems to be because of the 4 and 5 series SIN has reached its limit.
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Kaden
July 26, 2022 4:32 pmI applied my SIN in Hamilton back in October and my number start with 145-XXX-XXX, checked online and thought there was a glitched in government system!