| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 585-00** | (301) 585-0000 - (301) 585-0099 | 71 |
| (301) 585-01** | (301) 585-0100 - (301) 585-0199 | 76 |
| (301) 585-02** | (301) 585-0200 - (301) 585-0299 | 70 |
| (301) 585-03** | (301) 585-0300 - (301) 585-0395 | 75 |
| (301) 585-04** | (301) 585-0400 - (301) 585-0499 | 75 |
| (301) 585-05** | (301) 585-0500 - (301) 585-0599 | 80 |
| (301) 585-06** | (301) 585-0600 - (301) 585-0699 | 85 |
| (301) 585-07** | (301) 585-0700 - (301) 585-0798 | 75 |
| (301) 585-08** | (301) 585-0800 - (301) 585-0899 | 83 |
| (301) 585-09** | (301) 585-0900 - (301) 585-0997 | 73 |
US Phone Directory: (301) 585-0***
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