Buchanan County, MO
History
When originally formed in 1838, the county was named Roberts County, after settler Hiram Roberts. It was renamed in 1839 for James Buchanan, then a U.S. Senator and later President of the United States. The county was formed from land annexed to Missouri, as were five other counties.Source: Wikipedia
Modern Day Adjacent Counties
Andrew County (north)DeKalb County (northeast)
Clinton County (east)
Platte County (south)
Atchison County, Kansas (southwest)
Doniphan County, Kansas (northwest)