| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 528-00** | (301) 528-0000 - (301) 528-0099 | 81 |
| (301) 528-01** | (301) 528-0100 - (301) 528-0199 | 76 |
| (301) 528-02** | (301) 528-0200 - (301) 528-0299 | 80 |
| (301) 528-03** | (301) 528-0301 - (301) 528-0399 | 84 |
| (301) 528-04** | (301) 528-0400 - (301) 528-0499 | 76 |
| (301) 528-05** | (301) 528-0503 - (301) 528-0599 | 76 |
| (301) 528-06** | (301) 528-0600 - (301) 528-0699 | 86 |
| (301) 528-07** | (301) 528-0700 - (301) 528-0799 | 86 |
| (301) 528-08** | (301) 528-0800 - (301) 528-0899 | 82 |
| (301) 528-09** | (301) 528-0901 - (301) 528-0999 | 80 |
US Phone Directory: (301) 528-0***
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