| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 524-00** | (301) 524-0003 - (301) 524-0093 | 29 |
| (301) 524-01** | (301) 524-0100 - (301) 524-0198 | 31 |
| (301) 524-02** | (301) 524-0200 - (301) 524-0299 | 35 |
| (301) 524-03** | (301) 524-0301 - (301) 524-0388 | 28 |
| (301) 524-04** | (301) 524-0400 - (301) 524-0498 | 36 |
| (301) 524-05** | (301) 524-0500 - (301) 524-0596 | 27 |
| (301) 524-06** | (301) 524-0600 - (301) 524-0688 | 22 |
| (301) 524-07** | (301) 524-0701 - (301) 524-0796 | 28 |
| (301) 524-08** | (301) 524-0806 - (301) 524-0899 | 27 |
| (301) 524-09** | (301) 524-0902 - (301) 524-0999 | 32 |
US Phone Directory: (301) 524-0***
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