| Fire department | City | County | Career firefighters | Website |
|---|---|---|---|---|
| Wilmington Fire Department | Wilmington | New Castle | 156 | Official site |
| Wilmington Manor Volunteer Fire Company, Inc. | New Castle | New Castle | 68 | Official site |
| Christiana Fire Company | Christiana | New Castle | 20 | Official site |
| Lewes Volunteer Fire Department | Lewes | Sussex | 17 | Official site |
| Millville Volunteer Fire Company | Millville | Sussex | 16 | Official site |
| Rehoboth Beach Volunteer Fire Company | Rehoboth Beach | Sussex | 15 | Official site |
| Bethany Beach Volunteer Fire Company | Bethany Beach | Sussex | 12 | Official site |
| Volunteer Hose Company of Middletown | Middletown | New Castle | 11 | Official site |
| Seaford Volunteer Fire Department, Inc. | Seaford | Sussex | 10 | Official site |
| Claymont Fire Company | Claymont | New Castle | 9 | Official site |
| Mill Creek Fire Company | Marshallton | New Castle | 9 | Official site |
| Brandywine Hundred Fire Company NO 1 | Wilmington | New Castle | 8 | — |
| Delaware City Fire Company Station #15 | Delaware City | New Castle | 8 | Official site |
| Minquadale Fire Company | New Castle | New Castle | 8 | Official site |
| Minquas Fire Company No. 1 | Wilmington | New Castle | 8 | Official site |
| Laurel Fire Department, Inc. | Laurel | Sussex | 7 | Official site |
| Millsboro Fire Company | Millsboro | Sussex | 7 | — |
| Aetna Hose, Hook and Ladder Company | Newark | New Castle | 6 | Official site |
| Camden-Wyoming Fire Company, Inc. | Camden | Kent | 6 | Official site |
| Delmar Fire Department | Delmar | Sussex | 6 | Official site |
| Odessa Fire Company, Inc. (Station 24) | Odessa | New Castle | 6 | Official site |
| Talleyville Fire Company, Inc. | Talleyville | New Castle | 6 | Official site |
| Elsmere Fire Company NO 1 | Wilmington | New Castle | 5 | Official site |
| Good-Will Fire Company NO 1 | New Castle | New Castle | 5 | — |
| Hockessin Fire Company | Hockessin | New Castle | 5 | — |
| Memorial Volunteer Fire Company | Milford | Sussex | 5 | Official site |
| Dagsboro Volunteer Fire Department | Dagsboro | Sussex | 3 | Official site |
| Cheswold Volunteer Fire Company | Cheswold | Kent | 2 | Official site |
| Five Points Fire Company, Inc. | Wilmington | New Castle | 2 | Official site |
| Frederica Volunteer Fire Company | Frederica | Kent | 2 | — |
| Roxana Volunteer Fire Department | Frankford | Sussex | 2 | — |
| Selbyville Volunteer Fire Company, Inc. | Selbyville | Sussex | 2 | Official site |
| Townsend Fire Company | Townsend | New Castle | 2 | — |
| Hartly Volunteer Fire Department, Inc. | Hartly | Kent | 1 | Official site |
Largest first by career firefighters, as each employer reports it to its federal registry.
Source: U.S. Fire Administration (FEMA), National Fire Department Registry. Data captured September 30, 2026.