COUNTY · DE
Sussex County, Delaware
Sussex County is a county in Delaware with FIPS code 10005 and an estimated population of 263,509 (Census 2023), 2nd largest of 3 in the state.
County facts
- Name
- Sussex County
- State
- Delaware
- Type
- county
- FIPS code
- 10005
- State FIPS
- 10
- Population (2023)
- 263,509
- Change since 2020
- +10.4%
- State rank
- 2 of 3
Population is the Census Bureau’s Vintage 2023 estimate.
Other counties in Delaware
Questions
What is the FIPS code for Sussex County?
Sussex County, Delaware has the five-digit FIPS code 10005: 10 for the state and 005 for the county.
What state is Sussex County in?
Sussex County is in Delaware.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.