Bucklin is a city in southeast Linn County, Missouri, United States. The population was 413 at the 2020 census. Bucklin was laid out in 1854…Bucklin is a city in southeast Linn County, Missouri, United States. The population was 413 at the 2020 census. Bucklin was laid out in 1854, and named after James H. Bucklin, a railroad official of the Hannibal and St. Joseph Railroad. A post office called Bucklin has been in operation since 1860. Bucklin was the 1st location of the Missouri Farmers Association. The building still stands here today abandoned. And is in need of restoring or diminution. It is a hazard to pedestrians with falling bricks.