| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 203-10** | (301) 203-1000 - (301) 203-1099 | 73 |
| (301) 203-11** | (301) 203-1100 - (301) 203-1199 | 55 |
| (301) 203-12** | (301) 203-1200 - (301) 203-1298 | 76 |
| (301) 203-13** | (301) 203-1300 - (301) 203-1399 | 75 |
| (301) 203-14** | (301) 203-1400 - (301) 203-1499 | 58 |
| (301) 203-15** | (301) 203-1500 - (301) 203-1599 | 72 |
| (301) 203-16** | (301) 203-1600 - (301) 203-1698 | 71 |
| (301) 203-17** | (301) 203-1700 - (301) 203-1796 | 70 |
| (301) 203-18** | (301) 203-1800 - (301) 203-1899 | 70 |
| (301) 203-19** | (301) 203-1902 - (301) 203-1999 | 73 |
US Phone Directory: (301) 203-1***
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