| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 583-00** | (301) 583-0000 - (301) 583-0099 | 66 |
| (301) 583-01** | (301) 583-0100 - (301) 583-0197 | 55 |
| (301) 583-02** | (301) 583-0200 - (301) 583-0299 | 51 |
| (301) 583-03** | (301) 583-0300 - (301) 583-0399 | 56 |
| (301) 583-04** | (301) 583-0403 - (301) 583-0499 | 48 |
| (301) 583-05** | (301) 583-0500 - (301) 583-0598 | 66 |
| (301) 583-06** | (301) 583-0601 - (301) 583-0699 | 43 |
| (301) 583-07** | (301) 583-0701 - (301) 583-0794 | 45 |
| (301) 583-08** | (301) 583-0801 - (301) 583-0898 | 43 |
| (301) 583-09** | (301) 583-0902 - (301) 583-0998 | 42 |
US Phone Directory: (301) 583-0***
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