| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 770-80** | (240) 770-8000 - (240) 770-8099 | 89 |
| (240) 770-81** | (240) 770-8101 - (240) 770-8199 | 92 |
| (240) 770-82** | (240) 770-8200 - (240) 770-8299 | 97 |
| (240) 770-83** | (240) 770-8301 - (240) 770-8399 | 92 |
| (240) 770-84** | (240) 770-8401 - (240) 770-8499 | 89 |
| (240) 770-85** | (240) 770-8500 - (240) 770-8598 | 90 |
| (240) 770-86** | (240) 770-8600 - (240) 770-8699 | 92 |
| (240) 770-87** | (240) 770-8700 - (240) 770-8799 | 95 |
| (240) 770-88** | (240) 770-8800 - (240) 770-8899 | 91 |
| (240) 770-89** | (240) 770-8900 - (240) 770-8999 | 93 |
US Phone Directory: (240) 770-8***
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