Millsboro
- County:
- Sussex County
- County Seat:
- No
- Area (mi²):
- 5.11
- State:
- Delaware
Millsboro is a town located in Sussex County, Delaware. Millsboro has a 2026 population of 7,864. Millsboro is currently growing at a rate of 2.68% annually and its population has increased by 13.27% since the most recent census, which recorded a population of 6,943 in 2020.