The county with the most people in it in the United States is Los Angeles County, located in California.
Milwaukee County is the most populous county in Wisconsin.
According to census.gov, Middlesex County, Massachusetts has the most population with 1,473,416 people in 2007.
According to census.gov, Minnehaha County, South Dakota, has the most population at 175,272 people in 2007.
According to census.gov, King County, Washington, has the most population at 1,859,284 people in 2007.According to "Washington State" history book: King County with 1,685,600 as of 2000.
Greenville County in South Carolina has the highest population.
Oklahoma County
New Castle County.
County Dublin
County Dublin
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Milwaukee County is the most populous county in Wisconsin.
Cook County is the largest county in Illinois with an estimated population of 5,238,216 as of July 1, 2015 per the U.S. Census Bureau.
Honolulu county & city-876,156
The most black people areas in florida would be broward county and some parts of miami dade county. The most white people area would be palm beach county upper county of broward in south florida
Mecklenburg County has the most people in North Carolina. Mecklenburg has nearly one million people. Wake County is the next largest county.
the county in Tennessee with the highest population is Shelby county. it has a population of 906, 825 people.
According to census.gov, Hennepin County, Minnesota, has the most population at 1,136,599 people.