When originally formed in 1838, Buchanan 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. The county seat is St. Joseph.
| NW Missouri Genealogical Society 412 Felix Street Saint Joseph, Missouri 64501 816.233.0524 |
St. Joseph Public Library 927 Felix Street St. Joseph, MO 64501 816.232.7729 |
Buchanan County Clerk 411 Jules Room 121 St. Joseph, MO 64501 816.271.1412 |
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