| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 585-30** | (301) 585-3000 - (301) 585-3099 | 80 |
| (301) 585-31** | (301) 585-3100 - (301) 585-3197 | 75 |
| (301) 585-32** | (301) 585-3200 - (301) 585-3297 | 79 |
| (301) 585-33** | (301) 585-3300 - (301) 585-3392 | 69 |
| (301) 585-34** | (301) 585-3400 - (301) 585-3497 | 68 |
| (301) 585-35** | (301) 585-3500 - (301) 585-3598 | 73 |
| (301) 585-36** | (301) 585-3600 - (301) 585-3699 | 78 |
| (301) 585-37** | (301) 585-3700 - (301) 585-3799 | 68 |
| (301) 585-38** | (301) 585-3800 - (301) 585-3898 | 68 |
| (301) 585-39** | (301) 585-3901 - (301) 585-3999 | 65 |
US Phone Directory: (301) 585-3***
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