| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 523-80** | (301) 523-8001 - (301) 523-8097 | 32 |
| (301) 523-81** | (301) 523-8107 - (301) 523-8180 | 16 |
| (301) 523-82** | (301) 523-8205 - (301) 523-8291 | 25 |
| (301) 523-83** | (301) 523-8302 - (301) 523-8394 | 24 |
| (301) 523-84** | (301) 523-8403 - (301) 523-8497 | 29 |
| (301) 523-85** | (301) 523-8501 - (301) 523-8599 | 25 |
| (301) 523-86** | (301) 523-8604 - (301) 523-8695 | 33 |
| (301) 523-87** | (301) 523-8700 - (301) 523-8795 | 29 |
| (301) 523-88** | (301) 523-8800 - (301) 523-8896 | 33 |
| (301) 523-89** | (301) 523-8905 - (301) 523-8995 | 28 |
US Phone Directory: (301) 523-8***
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