The facts on the Chicago population were taken from the MicroTrends: 
https://www.macrotrends.net/cities/22956/chicago/population
UPDATE
The stats given during this episode were for the Chicago Metropolitan area. Since we were talking about the city of Chicago specifically, a more accurate set of stats can be found at: 
https://www.census.gov/quickfacts/chicagocityillinois 
https://www.biggestuscities.com/city/chicago-illinois 
There is a big drop of 45,175 between 2021 and 2020 
2021 - 2,696,555 
2020 - 2,741,730 
1950 - 3,620,962 
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