For general information about the County Administrative Offices or County services, please call (302) 855-7700. To contact a specific department, see the list below. For infomation about a department, click the department name.
Options for the Hearing Impaired (free services provided through the Delaware Relay Center):
- Voice Carry-Over: Call 711 (in-state residents only) or (877) 335-7590
- TTY: Call 711 (in-state residents only) or (800) 232-5460
- Sprint IP Relay
| Office | Phone | Fax | |
| Airport | (302) 855-7774 | (302) 855-7773 | Eric Littleton |
| Assessment | (302) 855-7824 | (302) 855-7828 | Chris Keeler |
| Billing | (302) 855-7871 | (302) 854-5381 | Katrina Mears |
| Building Code | (302) 855-7860 | (302) 855-7821 | Andy Wright |
| Collections | (302) 855-7831 | (888) 622-0865 | Katrina Mears |
| Community Development & Housing | (302) 855-7777 | (302) 854-5397 | Brad Whaley |
| Constable | (302) 855-7819 | (302) 855-7798 | Lester Shaffer |
| County Administration | (302) 855-7742 | (302) 855-7749 | Todd Lawson |
| County Council | (302) 855-7743 | (302) 855-7749 | Robin Griffith |
| Economic Development | (302) 855-7770 | (302) 855-7805 | William Pfaff |
| Emergency Medical Services | (302) 854-5050 | (302) 855-7780 | Robert Stuart |
| Emergency Operations Center | (302) 855-7801 | (302) 855-7805 | Joe Thomas |
| Engineering | (302) 855-7718 | (302) 855-7799 | Hans Medlarz |
| Environmental Services | (302) 855-7730 | (302) 539-0981 | Edwin Tennefoss Rodney Marvel |
| Facilities Management | (302) 855-7840 | (302) 855-7749 | Doug Stoakley |
| Finance Administration | (302) 855-7741 | (302) 855-7749 | Gina Jennings Kathy Roth |
| Historic Preservation | (302) 856-6138 | (302) 855-7799 | Dan Parsons |
| Human Resources | (302) 855-7711 | (302) 855-7715 | Karen Brewington Marcia Elliott |
| Industrial Park | (302) 855-7774 | (302) 855-7773 | Eric Littleton |
| Information Technology | (302) 855-7898 | (302) 853-5898 | Dwayne Kilgo |
| Libraries | (302) 855-7890 | (302) 855-7895 | Kathy Graybeal |
| Mapping & Addressing | (302) 855-1176 | (302) 853-5889 | Megan Nehrbas |
| Marriage Bureau | (302) 853-1717 | Norman 'Jay' Jones, Jr. | |
| Planning and Zoning | (302) 855-7878 | (302) 854-5079 | Janelle Cornwell |
| Press/Public Information Office | (302) 854-5000 | (302) 855-7749 | Chip Guy |
| Public Works | (302) 855-7703 | (302) 854-5396 | Michael Brady |
| Recorder of Deeds | (302) 855-7785 | (302) 855-7787 | Scott Dailey Catherine Jenkins |
| Register of Wills | (302) 855-7875 | (302) 853-5871 | Cynthia Green Patty Bodenweiser |
| Safety & Security | (302) 855-7730 | (302) 539-0981 | Ron Verosko |
| Sheriff | (302) 855-7830 | (302) 855-7832 | Robert T Lee |
| Technical Engineering | (302) 855-7718 | (302) 855-7799 | |
| Treasury | (302) 855-7766 | (302) 854-5078 | Katrina Mears |
| Utility Engineering | (302) 855-7717 | (302) 854-5391 | Brad Hawkes Keith Bryan |
| Utility Permits | (302) 855-7719 | (302) 853-5881 | Jayne Dickerson |
| Utility Planning | (302) 855-1299 | (302) 853-5881 | John Ashman |