| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 274-00** | (301) 274-0000 - (301) 274-0099 | 64 |
| (301) 274-01** | (301) 274-0100 - (301) 274-0199 | 75 |
| (301) 274-02** | (301) 274-0201 - (301) 274-0298 | 67 |
| (301) 274-03** | (301) 274-0300 - (301) 274-0399 | 69 |
| (301) 274-04** | (301) 274-0400 - (301) 274-0499 | 75 |
| (301) 274-05** | (301) 274-0501 - (301) 274-0599 | 68 |
| (301) 274-06** | (301) 274-0600 - (301) 274-0696 | 70 |
| (301) 274-07** | (301) 274-0700 - (301) 274-0799 | 73 |
| (301) 274-08** | (301) 274-0805 - (301) 274-0898 | 66 |
| (301) 274-09** | (301) 274-0900 - (301) 274-0999 | 61 |
US Phone Directory: (301) 274-0***
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