The province shed 50,900 jobs total from December 2017, according to the Statistics Canada report.
But on the other hand, the agency says the economy generated 49,000 full-time positions last month.
Nationally, It was payback time for Canada's labor market in January, Bloomberg News reported, with the biggest monthly job loss since the last recession - all part-time - as employers faced quickening wage gains.
It's the second straight month of job losses in the Greater Sudbury area.
However, analysts said it would take months of data to assess the fallout from Ontario's minimum-wage hike and cautioned against reading too much into January's employment declines.
The unemployment rate in Kitchener-Waterloo fell to 5.1 per cent, but only because of 2,600 drop in the local labour force.
The unemployment rate in Northeast B.C. dropped below four per cent in the first month of 2018.
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"Overall, a mysterious mix of good and bad, with the latter's impact blunted by how strong job gains were in the lead-up to these figures", CIBC chief economist Avery Shenfeld wrote in a research note to clients. The survey also detected stronger wage growth in January of 3.3 per cent, which also led some to point out possible connections to Ontario.
The region saw its unemployment rate at 3.8 per cent for the month, a dramatic rebound from one year ago when unemployment sat at 10.5 per cent at the start of 2017. It's the highest year-over-year increase since July 2015 when it rose 3.32 per cent.
Employment declines were seen across the field, from low-paying jobs in warehousing, retail and wholesale to lucrative areas of professional, scientific and technical services. Ontario lost 51,000 jobs in January, entirely due to losses in part-time work. While the unemployment rate in December was 8.6 per cent, month-over-month comparisons are hard to make as data is unadjusted for seasonal differences that can influence each month.
January's job losses lowered expectations that the Bank of Canada would hike interest rates at its next rate announcement scheduled for March. "But the details also looking wonky, with all of the job losses in part-time work".
With files from Canadian Press.
"One of the positives in today's release was the fact that wage growth picked up", said Craig Alexander, chief economist at the Conference Board of Canada.