| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 535-10** | (240) 535-1000 - (240) 535-1087 | 11 |
| (240) 535-11** | (240) 535-1112 - (240) 535-1191 | 14 |
| (240) 535-12** | (240) 535-1200 - (240) 535-1282 | 13 |
| (240) 535-13** | (240) 535-1303 - (240) 535-1390 | 17 |
| (240) 535-14** | (240) 535-1406 - (240) 535-1494 | 12 |
| (240) 535-15** | (240) 535-1500 - (240) 535-1593 | 12 |
| (240) 535-16** | (240) 535-1606 - (240) 535-1685 | 11 |
| (240) 535-17** | (240) 535-1704 - (240) 535-1797 | 15 |
| (240) 535-18** | (240) 535-1801 - (240) 535-1894 | 12 |
| (240) 535-19** | (240) 535-1901 - (240) 535-1993 | 17 |
US Phone Directory: (240) 535-1***
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