| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 603-00** | (301) 603-0000 - (301) 603-0099 | 69 |
| (301) 603-01** | (301) 603-0108 - (301) 603-0199 | 51 |
| (301) 603-02** | (301) 603-0201 - (301) 603-0299 | 69 |
| (301) 603-03** | (301) 603-0300 - (301) 603-0397 | 63 |
| (301) 603-04** | (301) 603-0401 - (301) 603-0499 | 70 |
| (301) 603-05** | (301) 603-0500 - (301) 603-0599 | 70 |
| (301) 603-06** | (301) 603-0601 - (301) 603-0699 | 60 |
| (301) 603-07** | (301) 603-0701 - (301) 603-0798 | 50 |
| (301) 603-08** | (301) 603-0803 - (301) 603-0899 | 53 |
| (301) 603-09** | (301) 603-0900 - (301) 603-0999 | 62 |
US Phone Directory: (301) 603-0***
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