| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (410) 770-40** | (410) 770-4000 - (410) 770-4034 | 4 |
| (410) 770-41** | (410) 770-4124 - (410) 770-4124 | 1 |
| (410) 770-43** | (410) 770-4300 - (410) 770-4394 | 22 |
| (410) 770-44** | (410) 770-4402 - (410) 770-4499 | 63 |
| (410) 770-45** | (410) 770-4500 - (410) 770-4599 | 70 |
| (410) 770-46** | (410) 770-4600 - (410) 770-4699 | 52 |
| (410) 770-47** | (410) 770-4701 - (410) 770-4799 | 65 |
| (410) 770-48** | (410) 770-4801 - (410) 770-4897 | 66 |
| (410) 770-49** | (410) 770-4900 - (410) 770-4999 | 50 |
US Phone Directory: (410) 770-4***
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