| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 439-70** | (301) 439-7001 - (301) 439-7099 | 69 |
| (301) 439-71** | (301) 439-7100 - (301) 439-7199 | 62 |
| (301) 439-72** | (301) 439-7200 - (301) 439-7299 | 61 |
| (301) 439-73** | (301) 439-7306 - (301) 439-7399 | 61 |
| (301) 439-74** | (301) 439-7401 - (301) 439-7499 | 70 |
| (301) 439-75** | (301) 439-7501 - (301) 439-7597 | 65 |
| (301) 439-76** | (301) 439-7600 - (301) 439-7699 | 75 |
| (301) 439-77** | (301) 439-7700 - (301) 439-7798 | 65 |
| (301) 439-78** | (301) 439-7800 - (301) 439-7899 | 62 |
| (301) 439-79** | (301) 439-7900 - (301) 439-7999 | 75 |
US Phone Directory: (301) 439-7***
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