Grafton
- County:
- Jersey County
- County Seat:
- No
- Area (mi²):
- 3.712
- State:
- Illinois
Grafton is a city located in Jersey County, Illinois. Grafton has a 2026 population of 772. Grafton is currently declining at a rate of -0.26% annually but its population has increased by 19.5% since the most recent census, which recorded a population of 646 in 2020.