| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 277-00** | (301) 277-0000 - (301) 277-0099 | 79 |
| (301) 277-01** | (301) 277-0100 - (301) 277-0199 | 81 |
| (301) 277-02** | (301) 277-0200 - (301) 277-0299 | 70 |
| (301) 277-03** | (301) 277-0302 - (301) 277-0399 | 76 |
| (301) 277-04** | (301) 277-0402 - (301) 277-0499 | 80 |
| (301) 277-05** | (301) 277-0501 - (301) 277-0599 | 73 |
| (301) 277-06** | (301) 277-0601 - (301) 277-0699 | 86 |
| (301) 277-07** | (301) 277-0700 - (301) 277-0799 | 80 |
| (301) 277-08** | (301) 277-0802 - (301) 277-0899 | 71 |
| (301) 277-09** | (301) 277-0902 - (301) 277-0998 | 71 |
US Phone Directory: (301) 277-0***
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