List of counties by U.S. state and territory

[2] The U.S. Census Bureau counts the 3 districts and 2 atolls of American Samoa as county-equivalents.

The State of California comprises 58 counties, including one consolidated city-county government.

The State of Colorado comprises 64 counties, including two consolidated city-county governments.

The United States Census Bureau and the Office of Management and Budget currently consider the District of Columbia to be a county-equivalent.

The State of Maryland comprises 23 counties and 1 independent city.

The Commonwealth of Massachusetts comprises 14 counties, including one consolidated city-county government.

The State of Missouri comprises 114 counties and one independent city.

The State of New Mexico comprises 33 counties, including one consolidated city-county government.

The State of North Carolina comprises 100 counties, including one consolidated city-county (Camden).

The U.S. Census Bureau counts the 4 municipalities of the Northern Mariana Islands as county-equivalents.

The Commonwealth of Pennsylvania comprises 67 counties, including one consolidated city-county government.

The U.S. Census Bureau counts the 78 municipalities of Puerto Rico as county-equivalents.

The United States Minor Outlying Islands have no counties.