City population data

 1940 100 largest cities

1950 standard metropolitan area data also by county

1950 cities w/ 25k+ pop. (by state)

https://www.biggestuscities.com/1950

2020 metropolitan statistical areas

Canada current 100 largest

top 20 cities all years

1790-1990 pop of 100 largest us cities by decade

1950-2000 largest cities

1790-1990 city rankings across years

1790-1990 distribution of 100 largest by state

errata

US summary

Alabama to D.C.

Florida to Indiana

Iowa to Massachusetts

Michigan to Nebraska

Nevada to North Dakota

Ohio to Pennsylvania

Rhode Island to Washington

West Virginia to Hawaii

Puerto Rico etc.