Sandwich
- County:
- DeKalb County
- County Seat:
- No
- Area (mi²):
- 4.736
- State:
- Illinois
Sandwich is a city located in DeKalb County, Illinois. Sandwich has a 2026 population of 7,299. Sandwich is currently growing at a rate of 0.95% annually and its population has increased by 1.22% since the most recent census, which recorded a population of 7,211 in 2020.