| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 523-30** | (301) 523-3000 - (301) 523-3097 | 25 |
| (301) 523-31** | (301) 523-3100 - (301) 523-3196 | 34 |
| (301) 523-32** | (301) 523-3200 - (301) 523-3298 | 34 |
| (301) 523-33** | (301) 523-3302 - (301) 523-3399 | 28 |
| (301) 523-34** | (301) 523-3400 - (301) 523-3499 | 33 |
| (301) 523-35** | (301) 523-3508 - (301) 523-3595 | 24 |
| (301) 523-36** | (301) 523-3600 - (301) 523-3699 | 35 |
| (301) 523-37** | (301) 523-3709 - (301) 523-3797 | 30 |
| (301) 523-38** | (301) 523-3801 - (301) 523-3895 | 33 |
| (301) 523-39** | (301) 523-3900 - (301) 523-3997 | 30 |
US Phone Directory: (301) 523-3***
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