Agency
- County:
- Buchanan County
- County Seat:
- No
- Area (mi²):
- 3.685
- State:
- Missouri
Agency is a village located in Buchanan County, Missouri. Agency has a 2026 population of 653. Agency is currently growing at a rate of 0.46% annually but its population has decreased by -2.1% since the most recent census, which recorded a population of 667 in 2020.