| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 340-10** | (301) 340-1000 - (301) 340-1099 | 78 |
| (301) 340-11** | (301) 340-1100 - (301) 340-1199 | 81 |
| (301) 340-12** | (301) 340-1200 - (301) 340-1299 | 68 |
| (301) 340-13** | (301) 340-1300 - (301) 340-1399 | 71 |
| (301) 340-14** | (301) 340-1400 - (301) 340-1499 | 80 |
| (301) 340-15** | (301) 340-1500 - (301) 340-1599 | 76 |
| (301) 340-16** | (301) 340-1600 - (301) 340-1699 | 80 |
| (301) 340-17** | (301) 340-1700 - (301) 340-1799 | 74 |
| (301) 340-18** | (301) 340-1800 - (301) 340-1897 | 80 |
| (301) 340-19** | (301) 340-1900 - (301) 340-1999 | 79 |
US Phone Directory: (301) 340-1***
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