Government
In the United States, a county is a political and administrative subdivision of a state, typically the primary unit of local government below the state level. As of 2024, there are 3,144 counties and county-equivalents in the 50 states and the District of Columbia, with an additional 100 county-equivalents in U.S. territories.1 Counties serve as the administrative arm of state government, providing services such as law enforcement, courts, public health, and infrastructure maintenance. Their structure and powers vary widely by state, reflecting the nation's federalist tradition and the diverse historical origins of local governance.
The county system in the United States traces its roots to the English shires and counties brought by early colonists. Virginia established the first counties in 1634, dividing its territory into eight shires, while New England towns initially held more power than counties, which were used mainly for judicial and administrative purposes.2 After independence, states adopted counties as a uniform layer of governance, but their roles expanded over the 19th century to include roads, schools, and welfare. The Progressive Era saw reforms such as county commissions and professional administrators, while the 20th century brought suburbanization and the rise of metropolitan counties that deliver urban services. Today, counties remain the most stable and widespread form of local government, with only Connecticut and Rhode Island having eliminated them as functioning governments, replacing them with councils of governments and regional planning agencies.1
County governments are typically led by an elected board of commissioners, supervisors, or a county council, and often include an elected sheriff, clerk, assessor, and coroner. The commission form is the most common, but many counties use a council-administrator or council-elected executive model, where a professional manager oversees daily operations. Counties provide essential services: law enforcement through county sheriffs, courts and jails, public health departments, social services, road maintenance, and election administration. In rural areas, counties are often the only local government, while in urban areas they may share power with municipalities. Some counties have consolidated with cities, such as San Francisco and Philadelphia, creating unified city-county governments. Counties also serve as the primary units for administering state and federal programs, including Medicaid, food assistance, and emergency management.3
Not all states use counties uniformly. Louisiana uses parishes, and Alaska uses boroughs, but both are considered county-equivalents by the U.S. Census Bureau.1 Independent cities, such as those in Virginia, are not part of any county, and the District of Columbia is a single county-equivalent. Texas has 254 counties, the most of any state, while Delaware has only three. County powers vary: in New England, counties are weak and often lack legislative authority, whereas in the South and West they are strong. Some counties have unique features, such as the consolidated city-county of Honolulu, which covers the entire island of Oahu, and the unorganized boroughs of Alaska, which have no local government and are administered by the state. These variations reflect historical settlement patterns and state constitutional choices.4
Beyond the familiar roles, counties have surprising dimensions. The smallest county by area is Kalawao County, Hawaii, at just 13 square miles, while the largest is San Bernardino County, California, spanning over 20,000 square miles. Loving County, Texas, has the fewest residents (about 60), while Los Angeles County has over 9.6 million, more than 40 states. County boundaries have occasionally shifted due to disputes, such as the 1918 Supreme Court case that settled the border between Oklahoma and Texas. Some counties have been renamed or abolished; for example, Dade County, Florida, was renamed Miami-Dade in 1997. Counties also play a role in data: the U.S. Census Bureau uses counties as the basis for statistical areas, and the National Association of Counties (NACo) advocates for their interests. In some states, counties have been granted home rule, allowing them to adopt charters and exercise broad powers, while others remain strictly limited by state law.
County governments are the most numerous form of general-purpose local government in the United States, with over 3,000 entities serving as the backbone of rural and suburban administration.
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