| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 770-10** | (301) 770-1000 - (301) 770-1099 | 61 |
| (301) 770-11** | (301) 770-1100 - (301) 770-1199 | 75 |
| (301) 770-12** | (301) 770-1200 - (301) 770-1299 | 51 |
| (301) 770-13** | (301) 770-1300 - (301) 770-1399 | 57 |
| (301) 770-14** | (301) 770-1400 - (301) 770-1499 | 67 |
| (301) 770-15** | (301) 770-1500 - (301) 770-1591 | 66 |
| (301) 770-16** | (301) 770-1600 - (301) 770-1697 | 69 |
| (301) 770-17** | (301) 770-1700 - (301) 770-1799 | 80 |
| (301) 770-18** | (301) 770-1800 - (301) 770-1899 | 71 |
| (301) 770-19** | (301) 770-1900 - (301) 770-1999 | 82 |
US Phone Directory: (301) 770-1***
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