https://css.umich.edu/publications/factsheets/built-environment/us-cities-factsheet

It is estimated that 83% of the U.S. population lives in urban areas, up from 64% in 1950

https://ourworldindata.org/data-insights/the-majority-of-people-in-the-world-now-live-in-cities

cities with more than 50,000 people have become the most popular living areas worldwide, as shown in the chart.

https://www.statista.com/statistics/270860/urbanization-by-continent/

North America as well as Latin America and the Caribbean were the regions with the highest level of urbanization, with over four fifths of the population residing in urban areas.

Looking at counties instead of actual cities is your problem.