| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 290-00** | (301) 290-0000 - (301) 290-0099 | 70 |
| (301) 290-01** | (301) 290-0100 - (301) 290-0198 | 67 |
| (301) 290-02** | (301) 290-0202 - (301) 290-0298 | 49 |
| (301) 290-03** | (301) 290-0300 - (301) 290-0399 | 64 |
| (301) 290-04** | (301) 290-0401 - (301) 290-0499 | 76 |
| (301) 290-05** | (301) 290-0500 - (301) 290-0598 | 64 |
| (301) 290-06** | (301) 290-0600 - (301) 290-0699 | 70 |
| (301) 290-07** | (301) 290-0701 - (301) 290-0799 | 53 |
| (301) 290-08** | (301) 290-0800 - (301) 290-0899 | 73 |
| (301) 290-09** | (301) 290-0900 - (301) 290-0999 | 60 |
US Phone Directory: (301) 290-0***
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