| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 423-10** | (301) 423-1000 - (301) 423-1099 | 67 |
| (301) 423-11** | (301) 423-1100 - (301) 423-1199 | 65 |
| (301) 423-12** | (301) 423-1200 - (301) 423-1299 | 69 |
| (301) 423-13** | (301) 423-1300 - (301) 423-1399 | 72 |
| (301) 423-14** | (301) 423-1400 - (301) 423-1497 | 58 |
| (301) 423-15** | (301) 423-1501 - (301) 423-1599 | 72 |
| (301) 423-16** | (301) 423-1600 - (301) 423-1699 | 69 |
| (301) 423-17** | (301) 423-1700 - (301) 423-1799 | 79 |
| (301) 423-18** | (301) 423-1800 - (301) 423-1899 | 76 |
| (301) 423-19** | (301) 423-1900 - (301) 423-1999 | 75 |
US Phone Directory: (301) 423-1***
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