| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 251-00** | (301) 251-0000 - (301) 251-0099 | 71 |
| (301) 251-01** | (301) 251-0100 - (301) 251-0199 | 79 |
| (301) 251-02** | (301) 251-0200 - (301) 251-0299 | 75 |
| (301) 251-03** | (301) 251-0300 - (301) 251-0398 | 72 |
| (301) 251-04** | (301) 251-0400 - (301) 251-0498 | 71 |
| (301) 251-05** | (301) 251-0500 - (301) 251-0599 | 71 |
| (301) 251-06** | (301) 251-0600 - (301) 251-0698 | 77 |
| (301) 251-07** | (301) 251-0700 - (301) 251-0798 | 72 |
| (301) 251-08** | (301) 251-0800 - (301) 251-0899 | 70 |
| (301) 251-09** | (301) 251-0900 - (301) 251-0999 | 64 |
US Phone Directory: (301) 251-0***
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