| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 420-70** | (301) 420-7001 - (301) 420-7098 | 63 |
| (301) 420-71** | (301) 420-7100 - (301) 420-7199 | 71 |
| (301) 420-72** | (301) 420-7200 - (301) 420-7299 | 62 |
| (301) 420-73** | (301) 420-7300 - (301) 420-7399 | 58 |
| (301) 420-74** | (301) 420-7401 - (301) 420-7499 | 60 |
| (301) 420-75** | (301) 420-7504 - (301) 420-7598 | 48 |
| (301) 420-76** | (301) 420-7603 - (301) 420-7697 | 57 |
| (301) 420-77** | (301) 420-7700 - (301) 420-7799 | 62 |
| (301) 420-78** | (301) 420-7800 - (301) 420-7898 | 55 |
| (301) 420-79** | (301) 420-7900 - (301) 420-7998 | 56 |
US Phone Directory: (301) 420-7***
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