Rock Port
- County:
- Atchison County
- County Seat:
- Yes
- Area (mi²):
- 2.771
- State:
- Missouri
Rock Port is a city located in Atchison County, Missouri. Rock Port has a 2026 population of 1,238. It is also the county seat of Atchison County. Rock Port is currently growing at a rate of 0.49% annually but its population has decreased by -2.9% since the most recent census, which recorded a population of 1,275 in 2020.