| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 779-30** | (301) 779-3000 - (301) 779-3097 | 71 |
| (301) 779-31** | (301) 779-3100 - (301) 779-3196 | 73 |
| (301) 779-32** | (301) 779-3201 - (301) 779-3299 | 71 |
| (301) 779-33** | (301) 779-3301 - (301) 779-3399 | 71 |
| (301) 779-34** | (301) 779-3400 - (301) 779-3498 | 67 |
| (301) 779-35** | (301) 779-3500 - (301) 779-3599 | 81 |
| (301) 779-36** | (301) 779-3601 - (301) 779-3697 | 70 |
| (301) 779-37** | (301) 779-3700 - (301) 779-3799 | 75 |
| (301) 779-38** | (301) 779-3800 - (301) 779-3899 | 63 |
| (301) 779-39** | (301) 779-3900 - (301) 779-3999 | 70 |
US Phone Directory: (301) 779-3***
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