| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 942-10** | (301) 942-1000 - (301) 942-1099 | 82 |
| (301) 942-11** | (301) 942-1100 - (301) 942-1198 | 77 |
| (301) 942-12** | (301) 942-1201 - (301) 942-1299 | 81 |
| (301) 942-13** | (301) 942-1300 - (301) 942-1398 | 77 |
| (301) 942-14** | (301) 942-1400 - (301) 942-1497 | 81 |
| (301) 942-15** | (301) 942-1500 - (301) 942-1599 | 81 |
| (301) 942-16** | (301) 942-1600 - (301) 942-1699 | 79 |
| (301) 942-17** | (301) 942-1700 - (301) 942-1799 | 85 |
| (301) 942-18** | (301) 942-1800 - (301) 942-1899 | 84 |
| (301) 942-19** | (301) 942-1901 - (301) 942-1999 | 90 |
US Phone Directory: (301) 942-1***
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