| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 681-30** | (301) 681-3000 - (301) 681-3099 | 84 |
| (301) 681-31** | (301) 681-3100 - (301) 681-3198 | 77 |
| (301) 681-32** | (301) 681-3200 - (301) 681-3299 | 84 |
| (301) 681-33** | (301) 681-3300 - (301) 681-3399 | 71 |
| (301) 681-34** | (301) 681-3400 - (301) 681-3499 | 77 |
| (301) 681-35** | (301) 681-3501 - (301) 681-3599 | 78 |
| (301) 681-36** | (301) 681-3600 - (301) 681-3699 | 86 |
| (301) 681-37** | (301) 681-3700 - (301) 681-3797 | 83 |
| (301) 681-38** | (301) 681-3802 - (301) 681-3899 | 78 |
| (301) 681-39** | (301) 681-3900 - (301) 681-3998 | 77 |
US Phone Directory: (301) 681-3***
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