The county was organized February 14, 1845 and named for Major General John Sullivan of the American Revolutionary War.
The county was organized February 14, 1845 and named for the Moniteau Creek.
The county was organized February 14, 1845 and named for General John F. Mercer of the Revolutionary War.
The county was organized February 14, 1845 and named for U. S. Secretary of War General Henry Knox.
The county was organized February 14, 1845 and named for U. S. Representative Albert G. Harrison of Missouri.
The county was organized February 14, 1845 and named for Colonel Richard Gentry of Boone County who fell in the Seminole War in 1837.
The county was organized February 14, 1845 and named for U. S. Senator David Rice Atchison from Missouri.
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