Rock Port is a city in, and the county seat of, Atchison County, Missouri, United States. The population was 1,278 at the 2020 census. Rock P…Rock Port is a city in, and the county seat of, Atchison County, Missouri, United States. The population was 1,278 at the 2020 census. Rock Port was laid out in the spring of 1851. The city, which is eight miles east of the Missouri River in the Loess Hills bluffs above the river, derives its name from Rock Creek, which flows through it. Following the Honey War border dispute with Iowa when Missouri's northern border was shifted farther south, the original county seat was moved from Linden to Rock Port.
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