The most populated county in the US is Los Angeles County in California with a total population of 9,878,554.
Wayne County is the most populated county.
Maricopa County home of the Phoenix area is the most populated county in Arizona.
Oahu is the most populated island in Hawaii; Maui County is the most populated county.
Cambria county
Los Angles is the most populated area of California. It is a mega metropolitan area.
Stoughton is the fifth most populated city in Dane county with a population of 12,692.
Los Angeles County
Cuyahoga County (Cleveland)
Salt Lake County
Delaware County, Pa. Right outside of Philadelphia.
Kentuckys most densely populated county is Jefferson.It has more than twice the populous as the second largest county Fayette.
Marion County has the most population In Indiana.