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This is a list of the 100 largest counties in the United States by area. The list is based upon the total area of a county, both land and water surface, reported by the United States Census Bureau during the 2000 Census. Alaska and Louisiana are not divided into counties.

A different ranking becomes apparent when comparing county areas by land area alone as opposed to total area. Some counties, such as Keweenaw and Alger Counties in Michigan, include significant amounts of water in their total area and would not appear on a list that considered land area alone. This list also includes the four counties that would be included when water area is not included.

Nine US states are smaller than San Bernardino County, California, and two states, Rhode Island and Delaware are smaller than the smallest counties on this list.

List of largest counties

Notes

1. ^ The figure shown in parentheses indicates the rank this county would have when considering land area only.

Alaskan boroughs and census areas

Unlike most states, Alaska is divided into boroughs and census areas that serve as county-equivalents for the Census Bureau. If included with the remainder of the counties and county-equivalent areas in the United States, Alaska's boroughs and census areas would occupy the largest 11. Below is a list of these boroughs and census areas that would rank in the top 100 if included in the above list.

The Unorganized Borough, in which all of the census areas are located, is not considered a county-equivalent area and is not included in this list. With an area of 323,440 sq mi (837,700 km), it would easily top the list, outranking every state in the country (except Alaska).

The rankings in the below list reflect the rank each borough or census area would have if included with all counties and county-equivalent areas in the United States (up to #11).

See also

• Geography portal
• United States portal

References

1. "United States -- County by State, and for Puerto Rico". United States Census Bureau. Retrieved 2009-06-25.

v t e United States county-related lists
General	Index By state or territory FIPS codes Former counties Secession proposals
Demographics	Population African-American majority Hispanic/Latino majority Native American majority Non-English speaking counties Most populous counties by state or territory Most densely populated county least Life expectancy shortest longest
Economy	Highest-income Lowest-income Per capita income
Geography	Largest area Smallest area Highest mean elevation
Name origins	Etymologies A–D E–I J–M N–R S–Z Former Most common names Named after Confederate historical figures Named after rivers Named after U.S. Presidents Named after women
See also	County statistics of the United States Smithsonian trinomial

• Lists of counties of the United States
• United States-related lists of superlatives
• Lists by area
• Largest things by area