Okanogan County.
The largest county in Washington state by land area is Okanogan County. It covers an area of approximately 5,315 square miles and is known for its diverse landscapes, including mountains, forests, and rivers.
Canada has the largest land area in the western hemisphere. Canada has the second largest land mass in the world behind Russia.
McLean County
Canada has the largest land area in the western hemisphere
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Marquette County is the largest county in Michigan by land area, covering 1,821 square miles.
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Marion County is the largest county in Indiana with an estimated population of 903,393 as of the 2010 U.S. Census. Allen County is the largest county in Indiana with total land area of 657 square miles.
The five largest counties by land area in the United States are San Bernardino County (California), Coconino County (Arizona), Nye County (Nevada), Elko County (Nevada), and Mohave County (Arizona).
Yazoo County is the largest county in Mississippi. Yazoo County has a total area (land and water) of 934 square miles, or 2420 km2. 1.57% of the county's total area is water. Thus: 919 mi² of Yazoo County, Mississippi is land area. 15 mi² is of Yazoo County, Mississippi is water area.