| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 221-30** | (240) 221-3003 - (240) 221-3099 | 92 |
| (240) 221-31** | (240) 221-3100 - (240) 221-3199 | 94 |
| (240) 221-32** | (240) 221-3200 - (240) 221-3299 | 95 |
| (240) 221-33** | (240) 221-3300 - (240) 221-3399 | 94 |
| (240) 221-34** | (240) 221-3400 - (240) 221-3499 | 91 |
| (240) 221-35** | (240) 221-3500 - (240) 221-3599 | 94 |
| (240) 221-36** | (240) 221-3600 - (240) 221-3699 | 94 |
| (240) 221-37** | (240) 221-3700 - (240) 221-3799 | 93 |
| (240) 221-38** | (240) 221-3800 - (240) 221-3899 | 91 |
| (240) 221-39** | (240) 221-3900 - (240) 221-3959 | 58 |
US Phone Directory: (240) 221-3***
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