Cook County is the most populous county in the U.S. state of Illinois and the second-most-populous county in the United States, after Los Angeles County, California.More than 40% of all residents of Illinois live within Cook County. As of 2020, the population was 5,275,541. Its county seat is Chicago, the most populous city in Illinois and the third-most-populous city in the United …

Westchester County is located in the U.S. state of New York.It is the seventh most populous county in the State of New York and the most populous north of New York City.Located in the Hudson Valley, Westchester covers an area of 450 square miles (1,200 km 2), consisting of six cities, 19 towns, and 23 villages.Established in 1683, Westchester was named after the city of …

Monroe County is a county in the Commonwealth of Pennsylvania.It is located in Northeastern Pennsylvania.As of the 2010 census, the population was 168,327. Its county seat is Stroudsburg. The county was formed from sections of Northampton and Pike counties on April 1, 1836.. Named in honor of James Monroe, the fifth president of the United States, the county is located in …

In United States local government, a consolidated city-county is formed when one or more cities and their surrounding county (parish in Louisiana, borough in Alaska) merge into one unified jurisdiction. As such it has the governmental powers of both a municipal corporation and an administrative division of a state.. A consolidated city-county is different from an independent …

Rank County Per capita income Median household income Median family income Population Number of households 1 New York County: $111,386 $64,971 $75,629

Los Angeles County, officially the County of Los Angeles, and sometimes abbreviated as L.A. County, is the most populous county in the United States and in the U.S. state of California, with 9,861,224 residents estimated as of 2022. It is the most populous non–state-level government entity in the United States.Its population is greater than that of 40 individual U.S. states.

DuPage County (/ ˌ d uː ˈ p eɪ dʒ / doo-PAYJ) is a county in the U.S. state of Illinois, and one of the collar counties of the Chicago metropolitan area.As of the 2020 census, the population was 932,877, making it Illinois' second-most populous county.Its county seat is Wheaton.. Known for its vast tallgrass prairies, DuPage County has become mostly developed and suburbanized, …

Passaic County (/ p ə ˈ s eɪ. ɪ k / pə-SAY-ik) is a county in the U.S. state of New Jersey that is part of the New York metropolitan area.The most populous place in Passaic County is Paterson, with 159,732 residents at the 2020 Census, more than 29% of the county's population, while West Milford covered 80.32 square miles (208.0 km 2), the largest total area of any municipality and …

Miami-Dade County is a county located in the southeastern part of the U.S. state of Florida.The county had a population of 2,701,767 as of the 2020 census, making it the most populous county in Florida and the seventh-most populous county in the United States. It is also Florida's third largest county in terms of land area, with 1,946 square miles (5,040 km 2).

Livingston County is a county in the U.S. state of New York.As of the 2020 census, the population was 61,834. Its county seat is Geneseo. The county is named after Robert R. Livingston, who helped draft the Declaration of Independence and negotiated the Louisiana Purchase.. Livingston County is part of the Rochester Metropolitan Statistical Area