Sussex
- County:
- Waukesha County
- County Seat:
- No
- Area (mi²):
- 8.431
- State:
- Wisconsin
Sussex is a village located in Waukesha County, Wisconsin. Sussex has a 2026 population of 12,607. Sussex is currently growing at a rate of 2.6% annually and its population has increased by 8.38% since the most recent census, which recorded a population of 11,632 in 2020.