| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 604-30** | (301) 604-3000 - (301) 604-3097 | 72 |
| (301) 604-31** | (301) 604-3101 - (301) 604-3199 | 67 |
| (301) 604-32** | (301) 604-3201 - (301) 604-3299 | 77 |
| (301) 604-33** | (301) 604-3300 - (301) 604-3399 | 75 |
| (301) 604-34** | (301) 604-3401 - (301) 604-3499 | 74 |
| (301) 604-35** | (301) 604-3501 - (301) 604-3597 | 68 |
| (301) 604-36** | (301) 604-3600 - (301) 604-3699 | 80 |
| (301) 604-37** | (301) 604-3700 - (301) 604-3798 | 68 |
| (301) 604-38** | (301) 604-3801 - (301) 604-3897 | 68 |
| (301) 604-39** | (301) 604-3900 - (301) 604-3999 | 71 |
US Phone Directory: (301) 604-3***
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