Lists of counties in the United States

The following are lists of U.S. counties and county-equivalents by various criteria.
By state
- Alabama
 - Alaska boroughs and census areas
 - Arizona
 - Arkansas
 - California
 - Colorado
 - Connecticut
 - Delaware
 - Florida
 - Georgia
 - Hawaii
 - Idaho
 - Illinois
 - Indiana
 - Iowa
 - Kansas
 - Kentucky
 - Louisiana parishes
 - Maine
 - Maryland
 - Massachusetts
 - Michigan
 - Minnesota
 - Mississippi
 - Missouri
 - Montana
 - Nebraska
 - Nevada
 - New Hampshire
 - New Jersey
 - New Mexico
 - New York
 - North Carolina
 - North Dakota
 - Ohio
 - Oklahoma
 - Oregon
 - Pennsylvania
 - Rhode Island
 - South Carolina
 - South Dakota
 - Tennessee
 - Texas
 - Utah
 - Vermont
 - Virginia
 - Washington
 - West Virginia
 - Wisconsin
 - Wyoming
 
In U.S. territories and federal district
The United States Census Bureau also divides the U.S. territories and the District of Columbia into county-equivalents:
- American Samoa's districts and atolls
 - Guam is counted as a single county-equivalent
 - Northern Mariana Islands municipalities
 - Puerto Rico municipalities
 - Each main island of the U.S. Virgin Islands
 - Each island of the United States Minor Outlying Islands
 - Washington, D.C. is counted as a single county-equivalent
 
By name
By name origin
By demographics
By geography