| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 523-40** | (301) 523-4000 - (301) 523-4099 | 23 |
| (301) 523-41** | (301) 523-4102 - (301) 523-4192 | 38 |
| (301) 523-42** | (301) 523-4200 - (301) 523-4299 | 32 |
| (301) 523-43** | (301) 523-4300 - (301) 523-4399 | 30 |
| (301) 523-44** | (301) 523-4405 - (301) 523-4496 | 24 |
| (301) 523-45** | (301) 523-4500 - (301) 523-4588 | 23 |
| (301) 523-46** | (301) 523-4600 - (301) 523-4695 | 26 |
| (301) 523-47** | (301) 523-4706 - (301) 523-4796 | 35 |
| (301) 523-48** | (301) 523-4800 - (301) 523-4899 | 28 |
| (301) 523-49** | (301) 523-4900 - (301) 523-4992 | 31 |
US Phone Directory: (301) 523-4***
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