| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 505-40** | (301) 505-4000 - (301) 505-4099 | 61 |
| (301) 505-41** | (301) 505-4100 - (301) 505-4195 | 62 |
| (301) 505-42** | (301) 505-4202 - (301) 505-4298 | 65 |
| (301) 505-43** | (301) 505-4301 - (301) 505-4397 | 63 |
| (301) 505-44** | (301) 505-4401 - (301) 505-4499 | 53 |
| (301) 505-45** | (301) 505-4522 - (301) 505-4522 | 1 |
| (301) 505-46** | (301) 505-4648 - (301) 505-4648 | 1 |
| (301) 505-47** | (301) 505-4765 - (301) 505-4765 | 1 |
| (301) 505-48** | (301) 505-4801 - (301) 505-4896 | 53 |
| (301) 505-49** | (301) 505-4900 - (301) 505-4995 | 55 |
US Phone Directory: (301) 505-4***
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