| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 523-60** | (301) 523-6001 - (301) 523-6096 | 29 |
| (301) 523-61** | (301) 523-6100 - (301) 523-6197 | 28 |
| (301) 523-62** | (301) 523-6204 - (301) 523-6298 | 27 |
| (301) 523-63** | (301) 523-6303 - (301) 523-6399 | 29 |
| (301) 523-64** | (301) 523-6400 - (301) 523-6495 | 37 |
| (301) 523-65** | (301) 523-6506 - (301) 523-6585 | 17 |
| (301) 523-66** | (301) 523-6600 - (301) 523-6699 | 30 |
| (301) 523-67** | (301) 523-6707 - (301) 523-6796 | 33 |
| (301) 523-68** | (301) 523-6802 - (301) 523-6899 | 29 |
| (301) 523-69** | (301) 523-6907 - (301) 523-6999 | 32 |
US Phone Directory: (301) 523-6***
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