| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (412) 521-50** | (412) 521-5000 - (412) 521-5099 | 76 |
| (412) 521-51** | (412) 521-5100 - (412) 521-5199 | 83 |
| (412) 521-52** | (412) 521-5200 - (412) 521-5299 | 90 |
| (412) 521-53** | (412) 521-5300 - (412) 521-5399 | 83 |
| (412) 521-54** | (412) 521-5400 - (412) 521-5498 | 71 |
| (412) 521-55** | (412) 521-5500 - (412) 521-5599 | 65 |
| (412) 521-56** | (412) 521-5600 - (412) 521-5697 | 68 |
| (412) 521-57** | (412) 521-5702 - (412) 521-5799 | 66 |
| (412) 521-58** | (412) 521-5802 - (412) 521-5899 | 79 |
| (412) 521-59** | (412) 521-5900 - (412) 521-5995 | 59 |
US Phone Directory: (412) 521-5***
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