| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 770-30** | (240) 770-3000 - (240) 770-3099 | 81 |
| (240) 770-31** | (240) 770-3100 - (240) 770-3199 | 72 |
| (240) 770-32** | (240) 770-3200 - (240) 770-3299 | 77 |
| (240) 770-33** | (240) 770-3300 - (240) 770-3399 | 69 |
| (240) 770-34** | (240) 770-3400 - (240) 770-3499 | 73 |
| (240) 770-35** | (240) 770-3500 - (240) 770-3598 | 70 |
| (240) 770-36** | (240) 770-3600 - (240) 770-3699 | 71 |
| (240) 770-37** | (240) 770-3700 - (240) 770-3799 | 72 |
| (240) 770-38** | (240) 770-3801 - (240) 770-3899 | 69 |
| (240) 770-39** | (240) 770-3900 - (240) 770-3999 | 70 |
US Phone Directory: (240) 770-3***
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