New Castle County, Delaware
New Castle County profile, demographic data, and geographic information.
Local Government & Public Administration
Authoritative general-purpose local government units serving this area
U.S. Census Bureau GUS (2026) / GMAF
| Government Unit | Unit Type | Jurisdiction Role | Contact / Address |
|---|---|---|---|
|
GUS Population: 588,093 (2024)
ID: 101811
|
County | Official County Government |
Contact: HR ADMINISTRATOR
87 READS WAY, NEW CASTLE DE 19720-1610
|
|
GUS Population: 73,176 (2024)
ID: 161529
|
Municipal | Municipal Government Within County |
Contact: MAYOR
800 N FRENCH ST, FL 1, WILMINGTON DE 19801-3537
|
|
GUS Population: 30,506 (2024)
ID: 101815
|
Municipal | Municipal Government Within County |
Contact: DEVELOPMENT MANAGER
220 S MAIN ST, NEWARK DE 19711-4594
|
|
GUS Population: 25,686 (2024)
ID: 194930
|
Municipal | Municipal Government Within County |
Contact: FINANCE MANAGER
19 W GREEN ST, MIDDLETOWN DE 19709-1315
|
|
GUS Population: 6,234 (2024)
ID: 161528
|
Municipal | Municipal Government Within County |
Contact: JOHN S GILES JR TOWN MANAGER
11 POPLAR AVENUE, ELSMERE DE 19805-2196
|
|
GUS Population: 5,715 (2024)
ID: 207648
|
Municipal | Municipal Government Within County |
Contact: CITY ADMINISTRATOR
220 DELAWARE ST, NEW CASTLE DE 19720-4816
|
|
GUS Population: 2,941 (2024)
ID: 161530
|
Municipal | Municipal Government Within County |
Contact: TOWN MANAGER
PO BOX 223, TOWNSEND DE 19734-0223
|
|
GUS Population: 1,933 (2024)
ID: 207647
|
Municipal | Municipal Government Within County |
Contact: MAYOR
PO BOX 4159, DELAWARE CITY DE 19706-4159
|
|
TOWN OF BELLEFONTE
GUS Population: 1,249 (2024)
ID: 124147
|
Municipal | Municipal Government Within County |
Contact: PRESIDENT
901A ROSEDALE AVE, WILMINGTON DE 19809
|
|
GUS Population: 909 (2024)
ID: 193142
|
Municipal | Municipal Government Within County |
Contact: TOWN MANAGER
226 N JAMES ST, NEWPORT DE 19804-3187
|
|
GUS Population: 437 (2024)
ID: 124149
|
Municipal | Municipal Government Within County |
Contact: CHAIR VILLAGE OF ARDEN
2119 THE HIGHWAY, ARDEN DE 19810
|
|
GUS Population: 366 (2024)
ID: 124148
|
Municipal | Municipal Government Within County |
Contact: MAYOR
PO BOX 111, ODESSA DE 19730-0111
|
|
GUS Population: 258 (2024)
ID: 101817
|
Municipal | Municipal Government Within County |
Contact: TOWN CHAIR
2206 MILLERS RD, WILMINGTON DE 19810
|
|
VILLAGE OF ARDENCROFT
GUS Population: 234 (2024)
ID: 161531
|
Municipal | Municipal Government Within County |
Contact: TOWN CHAIR
2121 THE HIGHWAY, ARDEN DE 19810-4106
|