Note: This is a listing of deprecated systems. These systems are either no longer in use or have been superceded by another system.
| System Name | Type | Flavor | City | County | Updated |
|---|---|---|---|---|---|
| Caldabaugh Communications (Bethany Beach) | LTR | Standard | Bethany Beach | Sussex | 2009-08-19 |
| Caldabaugh Communications (Oak Orchard) | LTR | Standard | Oak Orchard | Sussex | 2009-08-19 |
| Chrysler Newark Assembly Plant | Motorola | Type II | Newark | New Castle | 2009-10-24 |
| Delaware City Refining Company | NXDN | NEXEDGE 4800 | Delaware City | New Castle | 2018-05-08 |
| Delmarva Power / Atlantic City Electric | Motorola | Type II SmartZone | Various | Multi-County [23] | 2023-01-08 |
| General Motors Boxwood Road Plant | Motorola | Type II | Wilmington | New Castle | 2012-09-23 |
| MBNA Bank | Motorola | Type II Smartnet | Wilmington | New Castle | 2013-03-19 |
| Teltronic, Inc. | LTR | Standard | Beltsville | Multi-County [6] | 2007-04-27 |
| Valero Refinery | Motorola | Type II Smartnet | Delaware City | New Castle | 2010-06-29 |