State FIPS Code: 48
County FIPS Code: 491
County FIPS Class: H1
County Description:
| County Office Name | County Office Description | County Office Phone |
|---|---|---|
| Round Rock ISD Tax Collector | Round Rock ISD Tax Collector | (512) 464 - 512 |
| Williamson County Appraisal District | Williamson County Appraisal District | (512) 930 - 378 |
| Williamson County Clerk (Recorder) | Williamson County Clerk (Recorder) | (512) 943 - 151 |
| Williamson County Tax Office | Williamson County Tax Office | (512) 943 - 160 |
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