| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 499-30** | (301) 499-3000 - (301) 499-3099 | 49 |
| (301) 499-31** | (301) 499-3100 - (301) 499-3199 | 62 |
| (301) 499-32** | (301) 499-3200 - (301) 499-3299 | 55 |
| (301) 499-33** | (301) 499-3300 - (301) 499-3399 | 49 |
| (301) 499-34** | (301) 499-3400 - (301) 499-3499 | 59 |
| (301) 499-35** | (301) 499-3500 - (301) 499-3599 | 55 |
| (301) 499-36** | (301) 499-3600 - (301) 499-3699 | 59 |
| (301) 499-37** | (301) 499-3700 - (301) 499-3797 | 60 |
| (301) 499-38** | (301) 499-3802 - (301) 499-3899 | 56 |
| (301) 499-39** | (301) 499-3900 - (301) 499-3999 | 63 |
US Phone Directory: (301) 499-3***
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