| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 283-30** | (301) 283-3000 - (301) 283-3099 | 57 |
| (301) 283-31** | (301) 283-3100 - (301) 283-3197 | 68 |
| (301) 283-32** | (301) 283-3200 - (301) 283-3298 | 58 |
| (301) 283-33** | (301) 283-3300 - (301) 283-3397 | 56 |
| (301) 283-34** | (301) 283-3401 - (301) 283-3498 | 68 |
| (301) 283-35** | (301) 283-3500 - (301) 283-3596 | 63 |
| (301) 283-36** | (301) 283-3600 - (301) 283-3699 | 65 |
| (301) 283-37** | (301) 283-3701 - (301) 283-3799 | 55 |
| (301) 283-38** | (301) 283-3800 - (301) 283-3899 | 64 |
| (301) 283-39** | (301) 283-3900 - (301) 283-3999 | 61 |
US Phone Directory: (301) 283-3***
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