The state atlas

County maps by state

Choose a state for a labelled boundary map and an alphabetical list of every county or county-equivalent. Together, these maps cover 3,144 current county-equivalents.

Compare state systems

How county geography varies by state

The United States does not use one uniform county system. The average state has about 63 county-level units, but the range is wide: Texas has 254, while Delaware has only 3. Population does not determine the number. State history, settlement patterns, land area, and local-government law all shaped the map.

County names also describe only part of the picture. A nationwide dataset must account for Louisiana parishes, Alaska boroughs and census areas, Connecticut planning regions, and independent cities. These areas appear in the atlas because the Census Bureau treats them at the same statistical level as counties.

System	Where it appears	What to know
Parishes	Louisiana	Parishes fill the county-level role across the state.
Boroughs and census areas	Alaska	Boroughs cover organized areas; census areas divide the remaining unorganized borough for statistics.
Planning regions	Connecticut	Nine planning regions replaced the former eight counties as federal county-equivalents.
Independent cities	Virginia; also Maryland, Missouri, and Nevada	These cities are not legally inside a county and receive county-equivalent codes.
Federal district	Washington, D.C.	The District is represented as one county-equivalent.

For more detail, read the complete guide to county-equivalents.

Reference table

County count and largest county by state

Counts follow 2025 Census county-equivalent geography. “Largest” refers to land area, not population.

State or district	Region	County-level units	Local terminology	Largest by land area
Alabama	South	67	counties	Baldwin County · 1,590 sq mi
Alaska	West	30	boroughs and census areas	Yukon-Koyukuk Census Area · 145,767 sq mi
Arizona	West	15	counties	Coconino County · 18,616 sq mi
Arkansas	South	75	counties	Union County · 1,039 sq mi
California	West	58	counties	San Bernardino County · 20,068 sq mi
Colorado	West	64	counties	Las Animas County · 4,773 sq mi
Connecticut	Northeast	9	planning regions	Capitol Planning Region · 1,027 sq mi
Delaware	South	3	counties	Sussex County · 936 sq mi
District of Columbia	South	1	county-equivalent	District of Columbia · 61 sq mi
Florida	South	67	counties	Collier County · 1,997 sq mi
Georgia	South	159	counties	Ware County · 899 sq mi
Hawaii	West	5	counties	Hawaii County · 4,028 sq mi
Idaho	West	44	counties	Idaho County · 8,477 sq mi
Illinois	Midwest	102	counties	McLean County · 1,183 sq mi
Indiana	Midwest	92	counties	Allen County · 657 sq mi
Iowa	Midwest	99	counties	Kossuth County · 973 sq mi
Kansas	Midwest	105	counties	Butler County · 1,430 sq mi
Kentucky	South	120	counties	Pike County · 786 sq mi
Louisiana	South	64	parishes	Vernon Parish · 1,327 sq mi
Maine	Northeast	16	counties	Aroostook County · 6,671 sq mi
Maryland	South	24	counties and an independent city	Frederick County · 661 sq mi
Massachusetts	Northeast	14	counties	Worcester County · 1,511 sq mi
Michigan	Midwest	83	counties	Marquette County · 1,809 sq mi
Minnesota	Midwest	87	counties	St. Louis County · 6,248 sq mi
Mississippi	South	82	counties	Yazoo County · 922 sq mi
Missouri	Midwest	115	counties and an independent city	Texas County · 1,177 sq mi
Montana	West	56	counties	Beaverhead County · 5,543 sq mi
Nebraska	Midwest	93	counties	Cherry County · 5,960 sq mi
Nevada	West	17	counties and an independent city	Nye County · 18,182 sq mi
New Hampshire	Northeast	10	counties	Coos County · 1,795 sq mi
New Jersey	Northeast	21	counties	Burlington County · 799 sq mi
New Mexico	West	33	counties	Catron County · 6,924 sq mi
New York	Northeast	62	counties	St. Lawrence County · 2,680 sq mi
North Carolina	South	100	counties	Robeson County · 947 sq mi
North Dakota	Midwest	53	counties	McKenzie County · 2,760 sq mi
Ohio	Midwest	88	counties	Ashtabula County · 702 sq mi
Oklahoma	South	77	counties	Osage County · 2,247 sq mi
Oregon	West	36	counties	Harney County · 10,134 sq mi
Pennsylvania	Northeast	67	counties	Lycoming County · 1,229 sq mi
Rhode Island	Northeast	5	counties	Providence County · 409 sq mi
South Carolina	South	46	counties	Horry County · 1,133 sq mi
South Dakota	Midwest	66	counties	Meade County · 3,471 sq mi
Tennessee	South	95	counties	Shelby County · 753 sq mi
Texas	South	254	counties	Brewster County · 6,184 sq mi
Utah	West	29	counties	San Juan County · 7,824 sq mi
Vermont	Northeast	14	counties	Windsor County · 969 sq mi
Virginia	South	133	counties and independent cities	Pittsylvania County · 969 sq mi
Washington	West	39	counties	Okanogan County · 5,266 sq mi
West Virginia	South	55	counties	Randolph County · 1,040 sq mi
Wisconsin	Midwest	72	counties	Marathon County · 1,545 sq mi
Wyoming	West	23	counties	Sweetwater County · 10,427 sq mi

Land-area values are rounded from the Census boundary-file fields. A generalized map and rounded area are suitable for reference and comparison, not for legal boundary measurement.

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County maps by state

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How county geography varies by state

County count and largest county by state

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