| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 270-30** | (301) 270-3000 - (301) 270-3099 | 71 |
| (301) 270-31** | (301) 270-3100 - (301) 270-3199 | 67 |
| (301) 270-32** | (301) 270-3200 - (301) 270-3299 | 72 |
| (301) 270-33** | (301) 270-3300 - (301) 270-3399 | 69 |
| (301) 270-34** | (301) 270-3400 - (301) 270-3499 | 61 |
| (301) 270-35** | (301) 270-3500 - (301) 270-3594 | 63 |
| (301) 270-36** | (301) 270-3624 - (301) 270-3699 | 7 |
| (301) 270-37** | (301) 270-3702 - (301) 270-3797 | 23 |
| (301) 270-38** | (301) 270-3800 - (301) 270-3897 | 64 |
| (301) 270-39** | (301) 270-3901 - (301) 270-3999 | 79 |
US Phone Directory: (301) 270-3***
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