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
Anchorage
Matanuska Susitna
Fairbanks North Star
Kenai Peninsula
Juneau
Bethel
Kodiak Island
Ketchikan Gateway
Northwest Arctic
Nome
Valdez-Cordova
Sitka
Southeast Fairbanks
Prince of Wales-Hyder
Wrangell
Complete list of boroughs in Alaska
Major districts in American Samoa
Western
Eastern
Manu'a
Rose Island
Swains Island
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
Searcy
Sebastian
Faulkner
Saline
Craighead
Garland
White
Lonoke
Lafayette
Pope
Crawford
Independence
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
Lincoln
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
Miami Dade
Broward
Hillsborough
Palm Beach
Holmes
Duval
Pinellas
Manatee
Santa Rosa
Brevard
Pasco
Volusia
Seminole
Sarasota
Alachua
Complete list of counties in Florida
Major counties in Georgia
Charlton
Gwinnett
Cobb
Chatham
Clayton
Berrien
Forsyth
Richmond
Hall
Paulding
Brooks
Baker
Brantley
Appling
Atkinson
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
Bonner
Bingham
Latah
Nez Perce
Jefferson
Payette
Blaine
Jerome
Adams
Complete list of counties in Idaho
Major counties in Illinois
Iroquois
DuPage
Crawford
Will
Kane
McHenry
Winnebago
Macon
Champaign
Sangamon
Peoria
McLean
Rock Island
Kankakee
Adams
Complete list of counties in Illinois
Major counties in Indiana
Lawrence
DeKalb
Allen
Franklin
St. Joseph
Elkhart
Tippecanoe
Hendricks
Vanderburgh
Porter
Jackson
Marshall
Lake
Delaware
Bartholomew
Complete list of counties in Indiana
Major counties in Iowa
Linn
Marshall
Fremont
Black Hawk
Woodbury
Story
Dubuque
Pottawattamie
Carroll
Muscatine
Cerro Gordo
Ringgold
Ida
Buena Vista
Adair
Complete list of counties in Iowa
Major counties in Kansas
Greeley
Marion
Shawnee
Wyandotte
Cowley
Leavenworth
Riley
Brown
Reno
Montgomery
Comanche
Finney
Geary
Sumner
Allen
Complete list of counties in Kansas
Major counties in Kentucky
Franklin
Cumberland
Kenton
Barren
Fleming
Greenup
Breckinridge
Campbell
Bullitt
Boyle
Oldham
McCracken
Knott
Boyd
Adair
Complete list of counties in Kentucky
Major parishes in Louisiana
East Baton Rouge
Ouachita
Orleans
St. Tammany
Caddo
Calcasieu
Tangipahoa
Ascension
Rapides
Bossier
Terrebonne
St. Charles
St. Bernard
Acadia
Allen
Complete list of parishes in Louisiana
Major counties in Maine
York
Penobscot
Kennebec
Androscoggin
Aroostook
Oxford
Somerset
Waldo
Sagadahoc
Cumberland
Franklin
Hancock
Knox
Lincoln
Piscataquis
Complete list of counties in Maine
Major counties in Maryland
Prince George's
Baltimore County
Anne Arundel
Frederick
Harford
Cecil
Charles
St. Mary's
Wicomico
Calvert
Allegany
Caroline
Carroll
Dorchester
Garrett
Complete list of counties in Maryland
Major counties in Massachusetts
Dukes
Essex
Suffolk
Norfolk
Bristol
Hampden
Barnstable
Hampshire
Berkshire
Nantucket
Franklin
Middlesex
Plymouth
Worcester
More information about the counties in Massachusetts
Major counties in Michigan
Oakland
Macomb
Alcona
Genesee
Washtenaw
Roscommon
Ingham
Kalamazoo
Mason
Saginaw
Muskegon
Monroe
Iron
Benzie
Alger
Complete list of counties in Michigan
Major counties in Minnesota
Hennepin
Ramsey
Dakota
Anoka
Renville
St. Louis
Olmsted
Stearns
Redwood
Carver
Sherburne
Blue Earth
Clay
Otter Tail
Aitkin
Complete list of counties in Minnesota
Major counties in Mississippi
Hinds
Jasper
Coahoma
Rankin
Lafayette
Madison
Lee
Lawrence
Forrest
Lauderdale
Lincoln
Oktibbeha
Leflore
Adams
Alcorn
Complete list of counties in Mississippi
Major counties in Missouri
Monroe
Franklin
Howard
DeKalb
St. Louis
Callaway
Gasconade
Barry
Pettis
Platte
Bollinger
Dallas
Buchanan
Cape Girardeau
Boone
Complete list of counties in Missouri
Major counties in Montana
Yellowstone
Meagher
Missoula
Flathead
Cascade
Lewis and Clark
Ravalli
Silver Bow
Garfield
Prairie
Glacier
Fergus
Roosevelt
Beaverhead
Big Horn
Complete list of counties in Montana
Major counties in Nebraska
Clay
Lancaster
Sarpy
Pierce
Buffalo
Hooker
Holt
Scotts Bluff
Hall
Sioux
Adams
Brown
Hayes
Nuckolls
Valley
Complete list of counties in Nebraska
Major counties in Nevada
Lyon
Washoe
Carson City
Elko
Nye
Churchill
White Pine
Lander
Storey
Eureka
Clark
Douglas
Esmeralda
Humboldt
Lincoln
Complete list of counties in Nevada
Major counties in New Hampshire
Rockingham
Merrimack
Strafford
Grafton
Cheshire
Belknap
Coos
Carroll
Hillsborough
Sullivan
More information about the counties in New Hampshire
Major counties in New Jersey
Bergen
Camden
Cape May
Hudson
Ocean
Monmouth
Passaic
Union
Burlington
Gloucester
Atlantic
Cumberland
Essex
Hunterdon
Mercer
Complete list of counties in New Jersey
Major counties in New Mexico
Bernalillo
Doña Ana
Santa Fe
Sandoval
Valencia
Lea
McKinley
Chaves
Eddy
Curry
Rio Arriba
Luna
Catron
Cibola
Colfax
Complete list of counties in New Mexico
Major counties in New York
Essex
Queens
New York
Delaware
Bronx
St. Lawrence
Westchester
Erie
Seneca
Richmond
Onondaga
Nassau
Rockland
Albany
Dutchess
Complete list of counties in New York
Major counties in North Carolina
Mecklenburg
Wake
Guilford
Martin
Durham
Catawba
Buncombe
Pasquotank
Johnston
Cabarrus
Gaston
New Hanover
Alamance
Pitt
Alexander
Complete list of counties in North Carolina
Major counties in North Dakota
Cass
Burleigh
Grand Forks
Ward
Williams
Stutsman
McKenzie
Rolette
Mountrail
Hettinger
Adams
Barnes
Benson
Billings
Bottineau
Complete list of counties in North Dakota
Major municipalities in Northern Mariana Islands
Saipan
Tinian
Rota
Northern Islands
More information about the municipalities in Northern Mariana Islands
Major counties in Ohio
Guernsey
Cuyahoga
Fayette
Marion
Morrow
Belmont
Wyandot
Lorain
Crawford
Mahoning
Clermont
Medina
Adams
Allen
Ashland
Complete list of counties in Ohio
Major counties in Oklahoma
Oklahoma
Tulsa
Cimarron
Canadian
Cotton
Rogers
Payne
Washita
Creek
Muskogee
Ellis
Roger Mills
Le Flore
Dewey
Adair
Complete list of counties in Oklahoma
Major counties in Oregon
Multnomah
Clackamas
Yamhill
Deschutes
Klamath
Clatsop
Josephine
Hood River
Baker
Benton
Columbia
Coos
Crook
Curry
Douglas
Complete list of counties in Oregon
Major counties in Pennsylvania
Philadelphia
Allegheny
Bucks
Clinton
Snyder
Chester
Clarion
Berks
Lehigh
Westmoreland
Luzerne
Wyoming
Dauphin
Adams
Armstrong
Complete list of counties in Pennsylvania
Major municipalities in Puerto Rico
Peñuelas
Bayamón
Carolina
Ponce
Caguas
Adjuntas
Aguada
Aguadilla
Aguas Buenas
Aibonito
Añasco
Arecibo
Arroyo
Barceloneta
Barranquitas
Complete list of municipalities in Puerto Rico
Major counties in Rhode Island
Providence
Bristol
Newport
Kent
Washington
More information about the counties in Rhode Island
Major counties in South Carolina
Greenville
Charleston
Horry
Spartanburg
Lexington
Berkeley
Aiken
Beaufort
Florence
Orangeburg
Abbeville
Allendale
Anderson
Bamberg
Barnwell
Complete list of counties in South Carolina
Major counties in South Dakota
Minnehaha
Shannon
Lake
Bon Homme
Brookings
Sully
Codington
Yankton
Davison
Harding
Clay
Roberts
Charles Mix
Aurora
Beadle
Complete list of counties in South Dakota
Major counties in Tennessee
Marshall
Grainger
Lake
Fayette
Stewart
Lewis
Sequatchie
Blount
Morgan
Maury
Jefferson
Bedford
Anderson
Benton
Bledsoe
Complete list of counties in Tennessee
Major counties in Texas
Falls
Brooks
Tarrant
Bexar
Travis
Collin
Denton
Fort Bend
Baylor
Brazos
Cottle
Hardin
Brazoria
Atascosa
Anderson
Complete list of counties in Texas
Major districts in U.S. Virgin Islands
St. Thomas
St. John
St. Croix
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
Wasatch
Weber
Cache
Tooele
Box Elder
Uintah
Sanpete
Daggett
Duchesne
Beaver
Carbon
Davis
Emery
Complete list of counties in Utah
Major counties in Vermont
Chittenden
Rutland
Windsor
Lamoille
Addison
Bennington
Caledonia
Grand Isle
Essex
Franklin
Orange
Orleans
Washington
Windham
More information about the counties in Vermont
Major counties in Virginia
Fairfax County
Prince William
Virginia Beach
Loudoun
Brunswick
Henrico
Chesapeake
Arlington
Norfolk
Richmond
Newport News
Tazewell
Alexandria
Spotsylvania
Hampton
Complete list of counties in Virginia
Major counties in Washington
Snohomish
Spokane
Ferry
Kitsap
Yakima
Whatcom
Chelan
Skagit
Cowlitz
Pierce
Skamania
Grays Harbor
Adams
Asotin
Benton
Complete list of counties in Washington
Major counties in West Virginia
Kanawha
Clay
Monongalia
Cabell
Raleigh
Pleasants
Wood
Tucker
Mineral
Preston
Barbour
Berkeley
Boone
Braxton
Brooke
Complete list of counties in West Virginia
Major counties in Wisconsin
Milwaukee
Dane
Waukesha
Brown
Racine
Outagamie
Kenosha
Marathon
Washburn
La Crosse
Sheboygan
Ozaukee
Adams
Ashland
Barron
Complete list of counties in Wisconsin