Braymer is a city in southeast Caldwell County, Missouri. The population was 737 at the 2020 census. Braymer was laid out in 1887 by Milwau…Braymer is a city in southeast Caldwell County, Missouri. The population was 737 at the 2020 census. Braymer was laid out in 1887 by Milwaukee Land Company along the Chicago, Milwaukee, & St. Paul Railroad, and named for Judge Daniel Braymer, an influential local banker. A post office has been in operation at Braymer since 1887.