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County · code 48491

Williamson CountyTexas

Williamson County is a county in Texas with its seat in Georgetown. It was established in 1848 and named after Robert McAlpin Williamson.

  • Founded1848
  • County seatGeorgetown
  • Named forRobert McAlpin Williamson
  • Land area1,116 sq mi + 16 sq mi water
  • Population609,017 2020 Census
  • Parcels mapped291,033 checked 15 October 2026
Open the free map Click any parcel in Williamson County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

TravisBellBurnetBastropMilamLee Georgetown Census outline · seat marked

Where it is

Williamson on the map of Texas

Texas has 254 counties and county equivalents, each with its own records office. Shapes with a page are links.

Anderson CountyAndrews CountyAngelina CountyAransas CountyArcher CountyArmstrong CountyAtascosa CountyAustin CountyBailey CountyBandera CountyBastrop CountyBaylor CountyBee CountyBell CountyBexar CountyBlanco CountyBorden CountyBosque CountyBowie CountyBrazoria CountyBrazos CountyBrewster CountyBriscoe CountyBrooks CountyBrown CountyBurleson CountyBurnet CountyCaldwell CountyCalhoun CountyCallahan CountyCameron CountyCamp CountyCarson CountyCass CountyCastro CountyChambers CountyCherokee CountyChildress CountyClay CountyCochran CountyCoke CountyColeman CountyCollin CountyCollingsworth CountyColorado CountyComal CountyComanche CountyConcho CountyCooke CountyCoryell CountyCottle CountyCrane CountyCrockett CountyCrosby CountyCulberson CountyDallam CountyDallas CountyDawson CountyDeaf Smith CountyDelta CountyDenton CountyDeWitt CountyDickens CountyDimmit CountyDonley CountyDuval CountyEastland CountyEctor CountyEdwards CountyEllis CountyEl Paso CountyErath CountyFalls CountyFannin CountyFayette CountyFisher CountyFloyd CountyFoard CountyFort Bend CountyFranklin CountyFreestone CountyFrio CountyGaines CountyGalveston CountyGarza CountyGillespie CountyGlasscock CountyGoliad CountyGonzales CountyGray CountyGrayson CountyGregg CountyGrimes CountyGuadalupe CountyHale CountyHall CountyHamilton CountyHansford CountyHardeman CountyHardin CountyHarris CountyHarrison CountyHartley CountyHaskell CountyHays CountyHemphill CountyHenderson CountyHidalgo CountyHill CountyHockley CountyHood CountyHopkins CountyHouston CountyHoward CountyHudspeth CountyHunt CountyHutchinson CountyIrion CountyJack CountyJackson CountyJasper CountyJeff Davis CountyJefferson CountyJim Hogg CountyJim Wells CountyJohnson CountyJones CountyKarnes CountyKaufman CountyKendall CountyKenedy CountyKent CountyKerr CountyKimble CountyKing CountyKinney CountyKleberg CountyKnox CountyLamar CountyLamb CountyLampasas CountyLa Salle CountyLavaca CountyLee CountyLeon CountyLiberty CountyLimestone CountyLipscomb CountyLive Oak CountyLlano CountyLoving CountyLubbock CountyLynn CountyMcCulloch CountyMcLennan CountyMcMullen CountyMadison CountyMarion CountyMartin CountyMason CountyMatagorda CountyMaverick CountyMedina CountyMenard CountyMidland CountyMilam CountyMills CountyMitchell CountyMontague CountyMontgomery CountyMoore CountyMorris CountyMotley CountyNacogdoches CountyNavarro CountyNewton CountyNolan CountyNueces CountyOchiltree CountyOldham CountyOrange CountyPalo Pinto CountyPanola CountyParker CountyParmer CountyPecos CountyPolk CountyPotter CountyPresidio CountyRains CountyRandall CountyReagan CountyReal CountyRed River CountyReeves CountyRefugio CountyRoberts CountyRobertson CountyRockwall CountyRunnels CountyRusk CountySabine CountySan Augustine CountySan Jacinto CountySan Patricio CountySan Saba CountySchleicher CountyScurry CountyShackelford CountyShelby CountySherman CountySmith CountySomervell CountyStarr CountyStephens CountySterling CountyStonewall CountySutton CountySwisher CountyTarrant CountyTaylor CountyTerrell CountyTerry CountyThrockmorton CountyTitus CountyTom Green CountyTravis CountyTrinity CountyTyler CountyUpshur CountyUpton CountyUvalde CountyVal Verde CountyVan Zandt CountyVictoria CountyWalker CountyWaller CountyWard CountyWashington CountyWebb CountyWharton CountyWheeler CountyWichita CountyWilbarger CountyWillacy CountyWilson CountyWinkler CountyWise CountyWood CountyYoakum CountyYoung CountyZapata CountyZavala CountyWilliamson County Williamson
Counties of Texas · Williamson highlighted

History

Formed in 1848 from Milam County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Williamson County was created from Milam County on March 13, 1848, and fully organized later that year on August 7. In 1852, the county lost territory to the creation of Burnet County, but in 1853 it gained territory from Bell County. In 1856, Williamson exchanged small areas with Bastrop County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1848
    Williamson County created Williamson created from Milam; Williamson not fully organized.
    from Milam
    · Texas Laws 1847, 2d leg., ch. 78/p. 76; "Travis County v. Williamson County," in SW Rptr., 2d ser., 4:610-613
  2. 1848
    Changed Williamson fully organized. · Scarbrough, 125
  3. 1852
    Lost territory Williamson lost to creation of Burnet.
    to Burnet
    · Texas Laws 1851, 4th leg., reg. sess., ch. 60/p. 49
  4. 1853
    Gained territory Williamson gained from Bell and from Non-County Area 17 attached to Bell.
    from Bell
    · Texas Laws 1853, 4th leg., 2d sess., ch. 41/p. 53
  5. 1856
    Exchanged territory Williamson exchanged small areas with Bastrop.
    with Bastrop
    · Texas Laws 1856, 6th leg., adj. sess., ch. 88/p. 7

Land and parcels

What the maps cover in Williamson

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Williamson by the Census

Population
609,017 2020 Census count
Housing units
237,680 2020 Census count
Land area
1,116 square miles
Water area
16 square miles
People per sq mi
546 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Williamson County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Williamson County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Williamson County

When was Williamson County founded?
Williamson County was founded in 1848, formed from Milam County, and named after Robert McAlpin Williamson.
What is the county seat of Williamson County?
The county seat of Williamson County is Georgetown.
Is there an online parcel map for Williamson County?
Yes. Williamson County publishes a parcel map of 291,033 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Williamson County's boundary or name changed?
Williamson County was created in 1848 from Milam County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Bastrop County, Bell County and Burnet County.
Is my lot in a flood zone?
We do not have flood maps for Williamson County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door