Bing found the following results
Metropolitan area - Wikipedia
Metropolitan statistical area - Wikipedia
Metropolitan area | population, density, urbanization | Britannica
Metropolitan areas in the U.S. - statistics & facts | Statista
Largest Metropolitan Areas in the United States - ThoughtCo
About - Census.gov
Metropolitan areas in the world - OECD
United States metropolitan area - Simple English Wikipedia, the …
How is a metropolitan area defined? - Bureau of Economic …
Metropolitan area - Simple English Wikipedia, the free …