| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 421-40** | (240) 421-4074 - (240) 421-4091 | 2 |
| (240) 421-41** | (240) 421-4101 - (240) 421-4188 | 7 |
| (240) 421-42** | (240) 421-4208 - (240) 421-4288 | 9 |
| (240) 421-43** | (240) 421-4316 - (240) 421-4398 | 5 |
| (240) 421-44** | (240) 421-4465 - (240) 421-4499 | 2 |
| (240) 421-45** | (240) 421-4502 - (240) 421-4599 | 4 |
| (240) 421-46** | (240) 421-4635 - (240) 421-4635 | 1 |
| (240) 421-47** | (240) 421-4710 - (240) 421-4747 | 2 |
| (240) 421-48** | (240) 421-4836 - (240) 421-4894 | 4 |
| (240) 421-49** | (240) 421-4922 - (240) 421-4999 | 4 |
US Phone Directory: (240) 421-4***
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