| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 290-10** | (240) 290-1000 - (240) 290-1099 | 30 |
| (240) 290-11** | (240) 290-1103 - (240) 290-1198 | 24 |
| (240) 290-12** | (240) 290-1205 - (240) 290-1295 | 35 |
| (240) 290-13** | (240) 290-1307 - (240) 290-1386 | 21 |
| (240) 290-14** | (240) 290-1403 - (240) 290-1497 | 27 |
| (240) 290-15** | (240) 290-1502 - (240) 290-1598 | 29 |
| (240) 290-16** | (240) 290-1601 - (240) 290-1698 | 37 |
| (240) 290-17** | (240) 290-1704 - (240) 290-1799 | 26 |
| (240) 290-18** | (240) 290-1800 - (240) 290-1894 | 26 |
| (240) 290-19** | (240) 290-1900 - (240) 290-1994 | 33 |
US Phone Directory: (240) 290-1***
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