St. Joseph
- County:
- Buchanan County
- County Seat:
- No
- Area (mi²):
- 44.036
- State:
- Missouri
St. Joseph is a city located in Buchanan County, Missouri. St. Joseph has a 2026 population of 71,098. St. Joseph is currently growing at a rate of 0.35% annually but its population has decreased by -1.46% since the most recent census, which recorded a population of 72,153 in 2020.