| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 740-10** | (301) 740-1004 - (301) 740-1099 | 56 |
| (301) 740-11** | (301) 740-1118 - (301) 740-1118 | 1 |
| (301) 740-12** | (301) 740-1201 - (301) 740-1288 | 4 |
| (301) 740-13** | (301) 740-1302 - (301) 740-1377 | 9 |
| (301) 740-14** | (301) 740-1408 - (301) 740-1499 | 65 |
| (301) 740-15** | (301) 740-1500 - (301) 740-1599 | 70 |
| (301) 740-16** | (301) 740-1680 - (301) 740-1699 | 14 |
| (301) 740-17** | (301) 740-1700 - (301) 740-1799 | 63 |
| (301) 740-18** | (301) 740-1800 - (301) 740-1898 | 74 |
| (301) 740-19** | (301) 740-1901 - (301) 740-1998 | 73 |
US Phone Directory: (301) 740-1***
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