| Official Name: | Buchanan, Missouri |
| Settlement Type: | unincorporated community |
| Mapsize: | 250x200px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Missouri |
| Subdivision Type2: | County |
| Subdivision Name2: | Bollinger |
| Subdivision Type3: | Township |
| Subdivision Name3: | Filmore Township |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP code |
| Area Code: | 573 |
| Blank1 Name: | GNIS feature ID |
Buchanan is an unincorporated community in the southern part of Filmore Township in Bollinger County, Missouri, United States. The community lies approximately 18 miles southwest of Marble Hill and was named after James Buchanan, the fifteenth president of the United States, who served in office from 1857 to 1861.[1] [2] A post office was established in 1857 and remained in operation until 1940.[3]