| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 537-10** | (301) 537-1000 - (301) 537-1099 | 29 |
| (301) 537-11** | (301) 537-1101 - (301) 537-1198 | 34 |
| (301) 537-12** | (301) 537-1200 - (301) 537-1296 | 24 |
| (301) 537-13** | (301) 537-1308 - (301) 537-1398 | 21 |
| (301) 537-14** | (301) 537-1400 - (301) 537-1495 | 26 |
| (301) 537-15** | (301) 537-1500 - (301) 537-1597 | 28 |
| (301) 537-16** | (301) 537-1601 - (301) 537-1699 | 24 |
| (301) 537-17** | (301) 537-1700 - (301) 537-1798 | 36 |
| (301) 537-18** | (301) 537-1802 - (301) 537-1899 | 30 |
| (301) 537-19** | (301) 537-1900 - (301) 537-1999 | 32 |
US Phone Directory: (301) 537-1***
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