Williamson County property tax rates, 2025
Short answer: Williamson County's own 2025 rate is 0.413776 per $100 of taxable value, but that is only one line of your bill. City rates in Williamson County range from 0.151118 to 0.84, school districts from 0.861 to 1.2389, and special districts from 0.016949 to 1 per $100. Your total depends on which units cover your address — there is no single "Williamson County rate."
Appraisal district: Williamson Central Appraisal District (WCAD). Look up your parcel there to see the exact taxing units on your account, then plug them into the tax estimator.
What's different about Williamson County
Williamson County is one of the fastest-growing counties in Texas, and much of its new housing sits in special districts (119 special taxing units in the 2025 Comptroller data, many of them MUDs). Williamson has no county hospital district line like Travis or Harris.
Worked example: $400,000 homestead in Round Rock
Assumes a $400,000 appraised value, the $140,000 school general homestead exemption, and no local optional exemptions (many units offer them — check your appraisal district). Estimate only.
| Unit | Taxable value | Rate | Tax |
|---|---|---|---|
| Williamson County | $400,000 | 0.413776 | $1,655 |
| Round Rock | $400,000 | 0.372 | $1,488 |
| Round Rock ISD | $260,000 | 0.8931 | $2,322 |
| Total (estimate) | 1.678876 | $5,465 |
Formula per unit: taxable value ÷ 100 × rate. Want your own numbers? Use the tax estimator, protest savings or homestead cap tools.
County rate
| Taxing unit | Rate per $100 | Tax on $100,000 taxable |
|---|---|---|
| Williamson County | 0.413776 | $414 |
City rates (17)
| Taxing unit | Rate per $100 | Tax on $100,000 taxable |
|---|---|---|
| Granger | 0.84 | $840 |
| Bartlett (split) | 0.6594 | $659 |
| Taylor | 0.585 | $585 |
| Florence | 0.58255 | $583 |
| Austin (split) | 0.574017 | $574 |
| Thorndale (split) | 0.55019 | $550 |
| Pflugerville (split) | 0.535 | $535 |
| Liberty Hill | 0.469407 | $469 |
| Thrall | 0.44115 | $441 |
| Leander (split) | 0.417282 | $417 |
| Jarrell | 0.394004 | $394 |
| Hutto | 0.385928 | $386 |
| Round Rock (split) | 0.372 | $372 |
| Cedar Park (split) | 0.36 | $360 |
| Georgetown | 0.353 | $353 |
| Coupland | 0.222678 | $223 |
| Weir | 0.151118 | $151 |
School district rates (16)
| Taxing unit | Rate per $100 | Tax on $100,000 taxable |
|---|---|---|
| Liberty Hill ISD | 1.2389 | $1,239 |
| Thrall ISD | 1.2096 | $1,210 |
| Granger ISD | 1.2093 | $1,209 |
| Thorndale ISD (split) | 1.2072 | $1,207 |
| Hutto ISD | 1.2052 | $1,205 |
| Coupland ISD (split) | 1.1922 | $1,192 |
| Jarrell ISD | 1.1669 | $1,167 |
| Bartlett ISD (split) | 1.1604 | $1,160 |
| Pflugerville ISD (split) | 1.1069 | $1,107 |
| Leander ISD (split) | 1.0869 | $1,087 |
| Taylor ISD | 1.0638 | $1,064 |
| Georgetown ISD | 1.0506 | $1,051 |
| Florence ISD (split) | 1.0182 | $1,018 |
| Round Rock ISD (split) | 0.8931 | $893 |
| Burnet CISD (split) | 0.871 | $871 |
| Lexington ISD (split) | 0.861 | $861 |
Special district rates (119)
| Taxing unit | Rate per $100 | Tax on $100,000 taxable |
|---|---|---|
| Atlas Ranch MUD #1 | 1 | $1,000 |
| Leander MUD #1 | 1 | $1,000 |
| Leander MUD #2 | 1 | $1,000 |
| Leander MUD #3 | 1 | $1,000 |
| Williamson County MUD #37 | 1 | $1,000 |
| Cool Water MUD | 0.95 | $950 |
| North San Gabriel MUD #1 | 0.95 | $950 |
| Northwest Williamson Co MUD #1 | 0.95 | $950 |
| Northwest Williamson Co MUD #2 | 0.95 | $950 |
| Rancho Del Cielo MUD | 0.95 | $950 |
| Williamson County MUD #35 | 0.95 | $950 |
| Williamson County MUD #46 | 0.95 | $950 |
| Williamson County MUD #51 | 0.95 | $950 |
| Williamson County MUD #56 | 0.95 | $950 |
| Williamson-Liberty Hill MUD | 0.95 | $950 |
| Parkside on the River MUD #1 | 0.92 | $920 |
| Parkside on the River MUD #2 | 0.92 | $920 |
| Parkside on the River MUD #3 | 0.92 | $920 |
| Williamson County MUD #23 | 0.92 | $920 |
| Williamson County MUD #25 | 0.92 | $920 |
| Williamson County MUD #26 | 0.9 | $900 |
| Williamson County MUD #22 | 0.899 | $899 |
| Lakeside WCID #2A (split) | 0.89 | $890 |
| CLL MUD #1 | 0.8545 | $854 |
| Williamson County MUD #19C | 0.85 | $850 |
| Williamson County MUD #19G | 0.85 | $850 |
| Williamson County MUD #19H | 0.85 | $850 |
| Williamson County MUD #31 | 0.85 | $850 |
| Williamson County MUD #32 | 0.85 | $850 |
| Williamson County MUD #19F | 0.83 | $830 |
| Williamson County MUD #19B | 0.8276 | $828 |
| Williamson County MUD #19E | 0.7553 | $755 |
| Williamson County MUD #30 | 0.7355 | $736 |
| Williamson County MUD #12 | 0.7296 | $730 |
| Sonterra MUD | 0.7245 | $724 |
| Stonewall Ranch MUD | 0.7175 | $718 |
| West Williamson County MUD #1 | 0.714 | $714 |
| Lakeside MUD #3 (split) | 0.69 | $690 |
| West Williamson County MUD #2 | 0.682 | $682 |
| Round Rock MUD #1 | 0.68 | $680 |
| Williamson County MUD #34 | 0.666 | $666 |
| Williamson County MUD #29 | 0.65 | $650 |
| Sienna MUD #2 | 0.602 | $602 |
| Williamson County WSID #3 (split) | 0.583 | $583 |
| South Fork Ranch MUD #1 | 0.5775 | $578 |
| Williamson County MUD #28 | 0.5775 | $578 |
| Berry Creek Highlands MUD | 0.55 | $550 |
| Shell Road MUD | 0.55 | $550 |
| Woodside MUD #1 | 0.55 | $550 |
| Blockhouse MUD | 0.545 | $545 |
| Williamson County MUD #19A | 0.5367 | $537 |
| Sienna MUD #1 | 0.525 | $525 |
| Williamson County MUD #13 | 0.5241 | $524 |
| Round Rock MUD #2 | 0.511 | $511 |
| Watch Hill MUD | 0.4948 | $495 |
| Williamson County MUD #19 | 0.4899 | $490 |
| Highlands at Mayfield Ranch MUD | 0.485 | $485 |
| Williamson County MUD #15 | 0.4825 | $482 |
| Southeast Williamson Co. MUD #1 | 0.4665 | $466 |
| North San Gabriel MUD #2 | 0.43 | $430 |
| Paloma Lake MUD #2 | 0.4215 | $422 |
| Palmera Ridge MUD | 0.4 | $400 |
| Williamson County MUD #10 | 0.3875 | $388 |
| Brushy Creek MUD | 0.386837 | $387 |
| Parkside at Mayfield Ranch MUD | 0.3775 | $378 |
| Paloma Lake MUD #1 | 0.3725 | $372 |
| Williamson County MUD #11 | 0.3656 | $366 |
| Leander TODD MUD #1 | 0.35 | $350 |
| Walsh Ranch MUD | 0.3455 | $346 |
| Somerset Hills Road District #3 | 0.29 | $290 |
| Somerset Hills Road District #4 | 0.29 | $290 |
| Meadows of Chandler Creek MUD | 0.2849 | $285 |
| Williamson/Travis MUD #1 (split) | 0.2734 | $273 |
| Ranch Cypress Creek MUD #1 (split) | 0.24 | $240 |
| Wells Branch MUD (split) | 0.24 | $240 |
| North Austin MUD #1 (split) | 0.2165 | $216 |
| Vista Oaks MUD | 0.2131 | $213 |
| Fern Bluff MUD | 0.18 | $180 |
| Northwoods Road District #1 | 0.172 | $172 |
| Avery Centre Road District #1 | 0.15 | $150 |
| Anderson Mill Limited District (split) | 0.13434 | $134 |
| Georgetown Village Improvement Dist #1 | 0.12 | $120 |
| Austin Community College District (split) | 0.1034 | $103 |
| Williamson County ESD #1 | 0.1 | $100 |
| Williamson County ESD #10 | 0.1 | $100 |
| Williamson County ESD #2 | 0.1 | $100 |
| Williamson County ESD #3 | 0.1 | $100 |
| Williamson County ESD #6 | 0.1 | $100 |
| Williamson County ESD #7 | 0.1 | $100 |
| Williamson County ESD #5 | 0.099986 | $100 |
| Williamson County ESD #9 | 0.099911 | $100 |
| Williamson County ESD #8 | 0.0912 | $91 |
| Williamson County ESD #11 | 0.0909 | $91 |
| Brushy Creek MUD Defined Area | 0.09 | $90 |
| Williamson County ESD #12 | 0.08364 | $84 |
| Williamson County ESD #4 | 0.074495 | $74 |
| Pearson Place Road District | 0.049 | $49 |
| EWC Higher ED Center | 0.040871 | $41 |
| Donahoe Creek Watershed District (split) | 0.0224 | $22 |
| Upper Brushy Creek WCID | 0.017 | $17 |
| Lower Brushy Creek WCID | 0.016949 | $17 |
| 7S Ranch MUD | 0 | $0 |
| Avery Ranch Road District #1 | 0 | $0 |
| East Williamson County MUD #1 | 0 | $0 |
| Lakeside MUD #9 | 0 | $0 |
| Prairie Crossing MUD #1 | 0 | $0 |
| Prairie Crossing MUD #2 | 0 | $0 |
| Preserve at Water Oak PID | 0 | $0 |
| Sandow MUD #1 (split) | 0 | $0 |
| Sandow MUD #1A (split) | 0 | $0 |
| Sandow MUD #1B (split) | 0 | $0 |
| Solana Ranch MUD #1 | 0 | $0 |
| South Fork Ranch MUD #2 | 0 | $0 |
| Theon Ranches MUD #1 | 0 | $0 |
| Williamson County MUD #21 | 0 | $0 |
| Williamson County MUD #38 | 0 | $0 |
| Williamson County MUD #44 | 0 | $0 |
| Williamson County MUD #45 | 0 | $0 |
| Williamson County MUD #60 | 0 | $0 |
Source: Texas Comptroller of Public Accounts, 2025 Tax Rates and Levies (version dated 01/28/2026). Rates are adopted totals (M&O + I&S). See methodology.