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
Montgomery
Shelby
Lee
Morgan
Calhoun
Limestone
Etowah
St. Clair
Lauderdale
Elmore
Complete list of counties in Alabama
Major boroughs in Alaska
Aleutians East
Aleutians West
Anchorage
Bethel
Bristol Bay
Denali
Dillingham
Fairbanks North Star
Haines
Hoonah-Angoon
Juneau
Kenai Peninsula
Ketchikan Gateway
Kodiak Island
Lake and Peninsula
Complete list of boroughs in Alaska
Major districts in American Samoa
Eastern
Manu'a
Rose Island
Swains Island
Western
More information about the districts in American Samoa
Major counties in Arizona
Maricopa
Pima
Pinal
Yavapai
Mohave
Yuma
Coconino
Cochise
Navajo
Apache
Gila
Santa Cruz
Graham
La Paz
Greenlee
Complete list of counties in Arizona
Major counties in Arkansas
Pulaski
Benton
Washington
Sebastian
Faulkner
Saline
Craighead
Garland
White
Lonoke
Jefferson
Pope
Crawford
Greene
Baxter
Complete list of counties in Arkansas
Major counties in California
Los Angeles
San Diego
Orange
Riverside
San Bernardino
Santa Clara
Alameda
Sacramento
Contra Costa
Fresno
Kern
San Francisco
Ventura
San Joaquin
San Mateo
Complete list of counties in California
Major counties in Colorado
El Paso
Denver
Arapahoe
Jefferson
Adams
Douglas
Larimer
Boulder
Weld
Pueblo
Mesa
Garfield
Eagle
Montrose
Elbert
Complete list of 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
Middlesex
Tolland
Windham
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
Pinellas
Lee
Polk
Brevard
Pasco
Volusia
Seminole
Sarasota
Manatee
Alachua
Complete list of counties in Florida
Major counties in Georgia
Fulton
Gwinnett
Cobb
DeKalb
Chatham
Clayton
Cherokee
Forsyth
Henry
Richmond
Hall
Paulding
Columbia
Bibb
Clarke
Complete list of 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
Bannock
Madison
Bonner
Bingham
Latah
Nez Perce
Elmore
Payette
Blaine
Jerome
Complete list of counties in Idaho
Major counties in Illinois
Cook
DuPage
Lake
Will
Kane
McHenry
Winnebago
Madison
St. Clair
Champaign
Sangamon
Peoria
McLean
Rock Island
Kankakee
Complete list of counties in Illinois
Major counties in Indiana
Marion
Lake
Allen
Hamilton
St. Joseph
Elkhart
Tippecanoe
Hendricks
Vanderburgh
Porter
Johnson
Monroe
Madison
Delaware
Bartholomew
Complete list of counties in Indiana
Major counties in Iowa
Polk
Linn
Scott
Johnson
Black Hawk
Woodbury
Story
Dubuque
Pottawattamie
Clinton
Muscatine
Cerro Gordo
Jasper
Marion
Buena Vista
Complete list of counties in Iowa
Major counties in Kansas
Johnson
Sedgwick
Shawnee
Wyandotte
Douglas
Leavenworth
Riley
Butler
Reno
Saline
Crawford
Finney
Cowley
Geary
Sumner
Complete list of counties in Kansas
Major counties in Kentucky
Jefferson
Fayette
Kenton
Boone
Warren
Hardin
Madison
Daviess
Campbell
Bullitt
Christian
Oldham
McCracken
Pulaski
Boyd
Complete list of counties in Kentucky
Major parishes in Louisiana
East Baton Rouge
Jefferson
Orleans
St. Tammany
Lafayette
Caddo
Calcasieu
Ouachita
Livingston
Ascension
Rapides
Bossier
Terrebonne
St. Charles
St. Bernard
Complete list of parishes in Louisiana
Major counties in Maine
Cumberland
York
Penobscot
Kennebec
Androscoggin
Aroostook
Oxford
Hancock
Somerset
Knox
Waldo
Sagadahoc
Lincoln
Washington
Franklin
Complete list of counties in Maine
Major counties in Maryland
Montgomery
Prince George's
Baltimore
Anne Arundel
Howard
Frederick
Harford
Carroll
Charles
Washington
St. Mary's
Cecil
Wicomico
Calvert
Allegany
Complete list of counties in Maryland
Major counties in Massachusetts
Middlesex
Worcester
Essex
Suffolk
Norfolk
Bristol
Plymouth
Hampden
Barnstable
Hampshire
Berkshire
Franklin
Dukes
Nantucket
More information about the counties in Massachusetts
Major counties in Michigan
Wayne
Oakland
Macomb
Kent
Genesee
Washtenaw
Ottawa
Ingham
Kalamazoo
Livingston
Saginaw
Muskegon
St. Clair
Jackson
Berrien
Complete list of counties in Michigan
Major counties in Minnesota
Hennepin
Ramsey
Dakota
Anoka
Washington
St. Louis
Olmsted
Stearns
Scott
Wright
Carver
Sherburne
Blue Earth
Clay
Otter Tail
Complete list of counties in Minnesota
Major counties in Mississippi
Hinds
Harrison
DeSoto
Rankin
Jackson
Madison
Lee
Lauderdale
Forrest
Jones
Lamar
Oktibbeha
Warren
Leflore
Adams
Complete list of counties in Mississippi
Major counties in Missouri
St. Louis
St. Louis
Jackson
St. Charles
Greene
Clay
Jefferson
Boone
Jasper
Platte
Cass
Franklin
Christian
Buchanan
St. Francois
Complete list of counties in Missouri
Major counties in Montana
Yellowstone
Gallatin
Missoula
Flathead
Cascade
Lewis and Clark
Ravalli
Silver Bow
Lake
Lincoln
Glacier
Custer
Roosevelt
Fergus
Beaverhead
Complete list of counties in Montana
Major counties in Nebraska
Douglas
Lancaster
Sarpy
Hall
Buffalo
Dodge
Madison
Scotts Bluff
Lincoln
Platte
Adams
Cass
Dawson
Washington
Seward
Complete list of counties in Nebraska
Major counties in Nevada
Clark
Washoe
Lyon
Carson City
Elko
Nye
Douglas
Churchill
Humboldt
White Pine
Lander
Lincoln
Mineral
Storey
Eureka
Complete list of counties in Nevada
Major counties in New Hampshire
Hillsborough
Rockingham
Merrimack
Strafford
Grafton
Cheshire
Belknap
Carroll
Sullivan
Coos
More information about the counties in New Hampshire
Major counties in New Jersey
Bergen
Middlesex
Essex
Hudson
Ocean
Monmouth
Union
Passaic
Camden
Morris
Burlington
Mercer
Somerset
Gloucester
Atlantic
Complete list of counties in New Jersey
Major counties in New Mexico
Bernalillo
Santa Fe
Sandoval
San Juan
Valencia
Lea
McKinley
Otero
Chaves
Eddy
Curry
Rio Arriba
Luna
Lincoln
Catron
Complete list of counties in New Mexico
Major counties in New York
Queens
Suffolk
Bronx
Nassau
Westchester
Erie
Monroe
Onondaga
Orange
Rockland
Albany
Dutchess
Allegany
Broome
Cattaraugus
Complete list of counties in New York
Major counties in North Carolina
Mecklenburg
Wake
Guilford
Forsyth
Durham
Cumberland
Buncombe
Union
Johnston
Cabarrus
Gaston
New Hanover
Alamance
Pitt
Rowan
Complete list of counties in North Carolina
Major counties in North Dakota
Cass
Burleigh
Grand Forks
Ward
Williams
Stark
Morton
Stutsman
Richland
McKenzie
Rolette
Ramsey
McLean
Mountrail
Hettinger
Complete list of 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
Lucas
Butler
Stark
Lorain
Warren
Delaware
Lake
Mahoning
Clermont
Medina
Complete list of counties in Ohio
Major counties in Oklahoma
Oklahoma
Tulsa
Cleveland
Canadian
Comanche
Rogers
Payne
Pottawatomie
Creek
Muskogee
Garfield
Grady
Washington
Carter
Adair
Complete list of counties in Oklahoma
Major counties in Oregon
Multnomah
Washington
Clackamas
Lane
Marion
Jackson
Deschutes
Linn
Douglas
Yamhill
Benton
Josephine
Polk
Coos
Columbia
Complete list of counties in Oregon
Major counties in Pennsylvania
Philadelphia
Allegheny
Montgomery
Bucks
Delaware
Lancaster
Chester
York
Berks
Lehigh
Westmoreland
Luzerne
Northampton
Dauphin
Erie
Complete list of counties in Pennsylvania
Major municipalities in Puerto Rico
Adjuntas
Aguada
Aguadilla
Aguas Buenas
Aibonito
Añasco
Arecibo
Arroyo
Barceloneta
Barranquitas
Bayamón
Cabo Rojo
Caguas
Camuy
Canóvanas
Complete list of 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
Lexington
Berkeley
Anderson
Beaufort
Dorchester
Aiken
Florence
Pickens
Sumter
Orangeburg
Complete list of counties in South Carolina
Major counties in South Dakota
Minnehaha
Pennington
Lincoln
Brown
Brookings
Meade
Codington
Lawrence
Yankton
Davison
Hughes
Union
Clay
Roberts
Charles Mix
Complete list of counties in South Dakota
Major counties in Tennessee
Shelby
Davidson
Knox
Hamilton
Rutherford
Williamson
Montgomery
Sumner
Wilson
Sullivan
Blount
Washington
Maury
Madison
Anderson
Complete list of counties in Tennessee
Major counties in Texas
Harris
Dallas
Tarrant
Bexar
Travis
Collin
Denton
Fort Bend
Hidalgo
El Paso
Montgomery
Cameron
Brazoria
Bell
Anderson
Complete list of 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
Midway Islands
Navassa Island
Palmyra Atoll
Wake Island
More information about the territories in United States Minor Outlying Islands
Major counties in Utah
Salt Lake
Utah
Davis
Weber
Washington
Cache
Tooele
Iron
Box Elder
Summit
Wasatch
Uintah
Sanpete
Carbon
Duchesne
Complete list of counties in Utah
Major counties in Vermont
Chittenden
Washington
Rutland
Windsor
Franklin
Windham
Addison
Bennington
Caledonia
Orange
Orleans
Lamoille
Grand Isle
Essex
More information about the counties in Vermont
Major counties in Virginia
Fairfax
Prince William
Loudoun
Chesterfield
Henrico
Arlington
Stafford
Spotsylvania
Accomack
Albemarle
Alleghany
Amelia
Amherst
Appomattox
Augusta
Complete list of counties in Virginia
Major counties in Washington
King
Pierce
Snohomish
Spokane
Clark
Thurston
Kitsap
Yakima
Whatcom
Benton
Skagit
Cowlitz
Grant
Franklin
Grays Harbor
Complete list of counties in Washington
Major counties in West Virginia
Kanawha
Berkeley
Monongalia
Cabell
Wood
Raleigh
Harrison
Jefferson
Mercer
Putnam
Marion
Fayette
Hancock
Mineral
Barbour
Complete list of counties in West Virginia
Major counties in Wisconsin
Milwaukee
Dane
Waukesha
Brown
Racine
Outagamie
Winnebago
Kenosha
Rock
Marathon
Washington
La Crosse
Sheboygan
Walworth
Ozaukee
Complete list of counties in Wisconsin