| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 203-00** | (301) 203-0000 - (301) 203-0099 | 74 |
| (301) 203-01** | (301) 203-0101 - (301) 203-0199 | 74 |
| (301) 203-02** | (301) 203-0200 - (301) 203-0298 | 71 |
| (301) 203-03** | (301) 203-0300 - (301) 203-0398 | 73 |
| (301) 203-04** | (301) 203-0400 - (301) 203-0499 | 74 |
| (301) 203-05** | (301) 203-0500 - (301) 203-0599 | 79 |
| (301) 203-06** | (301) 203-0600 - (301) 203-0699 | 77 |
| (301) 203-07** | (301) 203-0700 - (301) 203-0799 | 67 |
| (301) 203-08** | (301) 203-0800 - (301) 203-0898 | 77 |
| (301) 203-09** | (301) 203-0900 - (301) 203-0999 | 78 |
US Phone Directory: (301) 203-0***
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