Chicago has lost a wee bit of its swagger.
According to Canadian Census data, Toronto's population was 2,791,140 in 2011, 84,000 more than Chicago's 2,707,120.
The population shift moves Toronto up as the fourth largest city in North America by population, moving Chicago to fifth.
The most-populated cities on the continent are Mexico City, New York and Los Angeles.
Even though the cities appear to be competing in terms of raw numbers, the relationship is actually quite civil. The mayor's of both cities renewed official sister city ties last year.
Chicago's population is in decline, hosting 200,000 fewer citizens than it did the previous 10 years, according to 2010 U.S. Census numbers.