| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 420-30** | (301) 420-3001 - (301) 420-3097 | 68 |
| (301) 420-31** | (301) 420-3101 - (301) 420-3199 | 73 |
| (301) 420-32** | (301) 420-3200 - (301) 420-3299 | 63 |
| (301) 420-33** | (301) 420-3307 - (301) 420-3399 | 67 |
| (301) 420-34** | (301) 420-3400 - (301) 420-3497 | 61 |
| (301) 420-35** | (301) 420-3501 - (301) 420-3598 | 78 |
| (301) 420-36** | (301) 420-3600 - (301) 420-3699 | 82 |
| (301) 420-37** | (301) 420-3700 - (301) 420-3799 | 84 |
| (301) 420-38** | (301) 420-3801 - (301) 420-3899 | 75 |
| (301) 420-39** | (301) 420-3900 - (301) 420-3999 | 72 |
US Phone Directory: (301) 420-3***
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