| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (210) 521-50** | (210) 521-5000 - (210) 521-5099 | 89 |
| (210) 521-51** | (210) 521-5100 - (210) 521-5199 | 88 |
| (210) 521-52** | (210) 521-5200 - (210) 521-5299 | 86 |
| (210) 521-53** | (210) 521-5300 - (210) 521-5399 | 86 |
| (210) 521-54** | (210) 521-5400 - (210) 521-5499 | 91 |
| (210) 521-55** | (210) 521-5500 - (210) 521-5599 | 90 |
| (210) 521-56** | (210) 521-5600 - (210) 521-5699 | 85 |
| (210) 521-57** | (210) 521-5700 - (210) 521-5799 | 89 |
| (210) 521-58** | (210) 521-5800 - (210) 521-5899 | 90 |
| (210) 521-59** | (210) 521-5900 - (210) 521-5998 | 79 |
US Phone Directory: (210) 521-5***
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