| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 422-40** | (301) 422-4000 - (301) 422-4097 | 51 |
| (301) 422-41** | (301) 422-4101 - (301) 422-4198 | 64 |
| (301) 422-42** | (301) 422-4200 - (301) 422-4299 | 60 |
| (301) 422-43** | (301) 422-4301 - (301) 422-4394 | 55 |
| (301) 422-44** | (301) 422-4400 - (301) 422-4489 | 44 |
| (301) 422-45** | (301) 422-4500 - (301) 422-4599 | 52 |
| (301) 422-46** | (301) 422-4603 - (301) 422-4699 | 63 |
| (301) 422-47** | (301) 422-4711 - (301) 422-4794 | 42 |
| (301) 422-48** | (301) 422-4810 - (301) 422-4888 | 52 |
| (301) 422-49** | (301) 422-4901 - (301) 422-4999 | 63 |
US Phone Directory: (301) 422-4***
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