Some of their responsibilities typically include law enforcement, judicial services, public health, infrastructure maintenance, land use planning, elections, tax collection, and records management. Counties also manage public works, social services, and sometimes education and libraries, ensuring the well-being and safety of their residents.
This is a directory of the major US counties and cities in each State. Whether you're planning a visit, conducting research, or simply curious about the diverse regions of this vast country, this page provides a list of the key counties that make up each state.
Major counties in Alabama
Jefferson
Mobile
Madison
Baldwin
Tuscaloosa
More information about the counties in Alabama
Major boroughs in Alaska
Aleutians East
Aleutians West
Anchorage
Bethel
Bristol Bay
More information about the boroughs in Alaska
Major districts in American Samoa
Eastern
Manu'a
Western
More information about the districts in American Samoa
Major counties in Arizona
Maricopa
Pima
Pinal
Yavapai
Mohave
More information about the counties in Arizona
Major counties in Arkansas
Pulaski
Benton
Washington
Sebastian
Faulkner
More information about the counties in Arkansas
Major counties in California
Los Angeles
San Diego
Orange
Riverside
San Bernardino
More information about the counties in California
Major counties in Colorado
El Paso
Denver
Arapahoe
Jefferson
Adams
More information about the counties in Colorado
Major wards in Columbia
District of Columbia
More information about the wards in Columbia
Major counties in Connecticut
Fairfield
Hartford
New Haven
New London
Litchfield
More information about the counties in Connecticut
Major counties in Delaware
New Castle
Sussex
Kent
More information about the counties in Delaware
Major counties in Florida
Broward
Hillsborough
Palm Beach
Orange
Duval
More information about the counties in Florida
Major counties in Georgia
Fulton
Gwinnett
Cobb
DeKalb
Chatham
More information about the counties in Georgia
Major districts in Guam
Latte Heights
More information about the districts in Guam
Major counties in Hawaii
Honolulu
Hawaii
Maui
Kauai
More information about the counties in Hawaii
Major counties in Idaho
Ada
Canyon
Kootenai
Bonneville
Twin Falls
More information about the counties in Idaho
Major counties in Illinois
Cook
DuPage
Lake
Will
Kane
More information about the counties in Illinois
Major counties in Indiana
Marion
Lake
Allen
Hamilton
St. Joseph
More information about the counties in Indiana
Major counties in Iowa
Polk
Linn
Scott
Johnson
Black Hawk
More information about the counties in Iowa
Major counties in Kansas
Johnson
Sedgwick
Shawnee
Wyandotte
Douglas
More information about the counties in Kansas
Major counties in Kentucky
Jefferson
Fayette
Kenton
Boone
Warren
More information about the counties in Kentucky
Major parishes in Louisiana
East Baton Rouge
Jefferson
Orleans
St. Tammany
Lafayette
More information about the parishes in Louisiana
Major counties in Maine
Cumberland
York
Penobscot
Kennebec
Androscoggin
More information about the counties in Maine
Major counties in Maryland
Montgomery
Prince George's
Baltimore
Anne Arundel
Howard
More information about the counties in Maryland
Major counties in Massachusetts
Middlesex
Worcester
Essex
Suffolk
Norfolk
More information about the counties in Massachusetts
Major counties in Michigan
Wayne
Oakland
Macomb
Kent
Genesee
More information about the counties in Michigan
Major counties in Minnesota
Hennepin
Ramsey
Dakota
Anoka
Washington
More information about the counties in Minnesota
Major counties in Mississippi
Hinds
Harrison
DeSoto
Rankin
Jackson
More information about the counties in Mississippi
Major counties in Missouri
St. Louis
St. Louis
Jackson
St. Charles
Greene
More information about the counties in Missouri
Major counties in Montana
Yellowstone
Gallatin
Missoula
Flathead
Cascade
More information about the counties in Montana
Major counties in Nebraska
Douglas
Lancaster
Sarpy
Hall
Buffalo
More information about the counties in Nebraska
Major counties in Nevada
Clark
Washoe
Lyon
Carson City
Elko
More information about the counties in Nevada
Major counties in New Hampshire
Hillsborough
Rockingham
Merrimack
Strafford
Grafton
More information about the counties in New Hampshire
Major counties in New Jersey
Bergen
Middlesex
Essex
Hudson
Ocean
More information about the counties in New Jersey
Major counties in New Mexico
Bernalillo
Santa Fe
Sandoval
San Juan
Valencia
More information about the counties in New Mexico
Major counties in New York
Queens
Suffolk
Bronx
Nassau
Westchester
More information about the counties in New York
Major counties in North Carolina
Mecklenburg
Wake
Guilford
Forsyth
Durham
More information about the counties in North Carolina
Major counties in North Dakota
Cass
Burleigh
Grand Forks
Ward
Williams
More information about the counties in North Dakota
Major municipalities in Northern Mariana Islands
Northern Islands
Rota
Saipan
Tinian
More information about the municipalities in Northern Mariana Islands
Major counties in Ohio
Franklin
Cuyahoga
Hamilton
Montgomery
Summit
More information about the counties in Ohio
Major counties in Oklahoma
Oklahoma
Tulsa
Cleveland
Canadian
Comanche
More information about the counties in Oklahoma
Major counties in Oregon
Multnomah
Washington
Clackamas
Lane
Marion
More information about the counties in Oregon
Major counties in Pennsylvania
Philadelphia
Allegheny
Montgomery
Bucks
Delaware
More information about the counties in Pennsylvania
Major municipalities in Puerto Rico
Adjuntas
Aguada
Aguadilla
Aguas Buenas
Aibonito
More information about the municipalities in Puerto Rico
Major counties in Rhode Island
Providence
Kent
Washington
Newport
Bristol
More information about the counties in Rhode Island
Major counties in South Carolina
Greenville
Charleston
Richland
Horry
Spartanburg
More information about the counties in South Carolina
Major counties in South Dakota
Minnehaha
Pennington
Lincoln
Brown
Brookings
More information about the counties in South Dakota
Major counties in Tennessee
Shelby
Davidson
Knox
Hamilton
Rutherford
More information about the counties in Tennessee
Major counties in Texas
Harris
Dallas
Tarrant
Bexar
Travis
More information about the counties in Texas
Major districts in U.S. Virgin Islands
St. Croix
St. John
St. Thomas
More information about the districts in U.S. Virgin Islands
Major territories in United States Minor Outlying Islands
Baker Island
Howland Island
Jarvis Island
Johnston Atoll
Kingman Reef
More information about the territories in United States Minor Outlying Islands
Major counties in Utah
Salt Lake
Utah
Davis
Weber
Washington
More information about the counties in Utah
Major counties in Vermont
Chittenden
Washington
Rutland
Windsor
Franklin
More information about the counties in Vermont
Major counties in Virginia
Fairfax
Prince William
Loudoun
Chesterfield
Henrico
More information about the counties in Virginia
Major counties in Washington
King
Pierce
Snohomish
Spokane
Clark
More information about the counties in Washington
Major counties in West Virginia
Kanawha
Berkeley
Monongalia
Cabell
Wood
More information about the counties in West Virginia
Major counties in Wisconsin
Milwaukee
Dane
Waukesha
Brown
Racine
More information about the counties in Wisconsin