| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (412) 521-00** | (412) 521-0000 - (412) 521-0099 | 16 |
| (412) 521-01** | (412) 521-0100 - (412) 521-0199 | 84 |
| (412) 521-02** | (412) 521-0200 - (412) 521-0299 | 81 |
| (412) 521-03** | (412) 521-0300 - (412) 521-0399 | 80 |
| (412) 521-04** | (412) 521-0401 - (412) 521-0499 | 81 |
| (412) 521-05** | (412) 521-0500 - (412) 521-0598 | 86 |
| (412) 521-06** | (412) 521-0601 - (412) 521-0698 | 84 |
| (412) 521-07** | (412) 521-0701 - (412) 521-0798 | 73 |
| (412) 521-08** | (412) 521-0800 - (412) 521-0898 | 86 |
| (412) 521-09** | (412) 521-0901 - (412) 521-0999 | 86 |
US Phone Directory: (412) 521-0***
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