| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 290-00** | (240) 290-0010 - (240) 290-0079 | 5 |
| (240) 290-01** | (240) 290-0160 - (240) 290-0160 | 1 |
| (240) 290-02** | (240) 290-0212 - (240) 290-0298 | 7 |
| (240) 290-03** | (240) 290-0306 - (240) 290-0396 | 5 |
| (240) 290-04** | (240) 290-0404 - (240) 290-0471 | 4 |
| (240) 290-05** | (240) 290-0500 - (240) 290-0591 | 6 |
| (240) 290-06** | (240) 290-0624 - (240) 290-0689 | 6 |
| (240) 290-07** | (240) 290-0700 - (240) 290-0741 | 5 |
| (240) 290-08** | (240) 290-0850 - (240) 290-0877 | 2 |
| (240) 290-09** | (240) 290-0964 - (240) 290-0975 | 2 |
US Phone Directory: (240) 290-0***
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