| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 604-30** | (240) 604-3000 - (240) 604-3072 | 4 |
| (240) 604-31** | (240) 604-3100 - (240) 604-3171 | 6 |
| (240) 604-32** | (240) 604-3250 - (240) 604-3277 | 3 |
| (240) 604-33** | (240) 604-3305 - (240) 604-3322 | 3 |
| (240) 604-34** | (240) 604-3478 - (240) 604-3478 | 1 |
| (240) 604-35** | (240) 604-3519 - (240) 604-3587 | 5 |
| (240) 604-36** | (240) 604-3635 - (240) 604-3644 | 2 |
| (240) 604-37** | (240) 604-3744 - (240) 604-3795 | 3 |
| (240) 604-38** | (240) 604-3803 - (240) 604-3870 | 2 |
| (240) 604-39** | (240) 604-3910 - (240) 604-3999 | 4 |
US Phone Directory: (240) 604-3***
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