| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 229-10** | (301) 229-1000 - (301) 229-1099 | 79 |
| (301) 229-11** | (301) 229-1100 - (301) 229-1199 | 93 |
| (301) 229-12** | (301) 229-1202 - (301) 229-1298 | 85 |
| (301) 229-13** | (301) 229-1300 - (301) 229-1399 | 90 |
| (301) 229-14** | (301) 229-1400 - (301) 229-1499 | 78 |
| (301) 229-15** | (301) 229-1500 - (301) 229-1599 | 80 |
| (301) 229-16** | (301) 229-1600 - (301) 229-1699 | 82 |
| (301) 229-17** | (301) 229-1700 - (301) 229-1799 | 90 |
| (301) 229-18** | (301) 229-1801 - (301) 229-1899 | 83 |
| (301) 229-19** | (301) 229-1900 - (301) 229-1999 | 83 |
US Phone Directory: (301) 229-1***
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