| Advantech Inc | 302-674-8405 | 1201-C College Park Dr | Dover | DE | 19904 |
| Alarm Data Inc | 302-368-1711 | 2605 Eastburn Ctr | Newark | DE | 19711 |
| Als Car Stereo | 302-731-3060 | 660 Kirkwood Hwy | Newark | DE | 19711 |
| Artway Construction Co | 302-998-2261 | 309 W Newport Pike | Wilmington | DE | 19804 |
| Audio Works | 302-323-0650 | 222 S Dupont Hwy | New Castle | DE | 19720 |
| Berley Security Systems | 302-791-9056 | 6701 Governor Printz Blvd | Wilmington | DE | 19809 |
| Capco Control Co | 302-996-5373 | 1525 Barley Mill Rd | Wilmington | DE | 19807 |
| Custom Security Systems | 302-475-2288 | 1716 Delpenn Rd | Wilmington | DE | 19810 |
| Delmarva Systems Corporation | 302-992-7950 | 1100 First State Blvd | Wilmington | DE | 19804 |
| Dyno Cleaning & Auto Detailing Ltd | 302-737-9442 | 83 Albe Dr | Newark | DE | 19702 |
| Fire Protection Industries Inc | 302-453-9237 | 361 Bellevue Rd | Newark | DE | 19713 |
| Infographic Systems Corp | 302-737-6568 | 13 N Kingston Dr | Newark | DE | 19713 |
| Integrated Protection Systems Inc | 302-792-5992 | 950 Ridge Rd | Claymont | DE | 19703 |
| Jeff Whites Auto Works Inc | 302-856-3333 | Rt 9 & 113 | Georgetown | DE | 19947 |
| Loss Prevention Services | 302-633-9144 | 2126 W Newport Pike | Wilmington | DE | 19804 |
| Mei Systems Div Of Red Lion Group Inc | 302-762-6770 | 100 Philadelphia Pike | Wilmington | DE | 19809 |
| Metal Detectors Of Delaware | 302-731-8263 | 47 E Main St | Newark | DE | 19711 |
| Mfp Fire Protection Inc | 302-798-3680 | 950 Ridge Rd | Holly Oak | DE | 19809 |
| National Security Network | 302-234-2022 | 9 Ryan White Cir | Wilmington | DE | 19707 |
| P A S Co | 302-239-3244 | 3060 Barley Mill Rd | Hockessin | DE | 19707 |
| Pennachi Paul Securty Syst | 302-322-8225 | 724 Pulaski Hwy | Bear | DE | 19701 |
| Pro Sec | 302-998-7494 | 5500 Kirkwood Hwy | Wilmington | DE | 19808 |
| Protector Systems Inc | 302-369-1350 | 2860 Ogletown Rd | Newark | DE | 19713 |
| Protector Systems Inc | 302-761-1080 | 3503 N Market St | Wilmington | DE | 19802 |
| Security Instruments Inc Security Services | 302-645-2212 | 1016 Highway One | Lewes | DE | 19958 |
| Sound Creations Inc | 302-234-4451 | Rte 41 & Yorklyn Rd | Hockessin | DE | 19707 |
| Sound Security System | 302-239-3744 | 4712 Ferris Dr | Hockessin | DE | 19707 |
| Star Communication Inc | 302-454-1991 | 1003 S Chapel St | Newark | DE | 19702 |
| Technicar Inc | 302-656-7733 | 1701 Concord Pike | Wilmington | DE | 19803 |
| Total Security | 302-996-3111 | 3422 Old Capitol Trl | Wilmington | DE | 19808 |
| Wayman Fire Protection Inc | 302-421-9058 | 1020 Wilson | Wilmington | DE | 19880 |
