Before revision: In urban planning, a historic core city or central city is the municipality with the largest 1940 population in the present metropolitan area (metropolitan statistical URL This term was retired by the US census bureau and replaced by the term principal city, which can include historic core cities and post WW2 cities.
After revision: In urban planning, a historic core city or central city is the municipality with the largest 1940 population in the present metropolitan area (metropolitan statistical URL This term was retired by the US census bureau and replaced by the term principal city, which can include historic core cities and post-WWII cities.