County · code 48319
Mason CountyTexas
Mason County is a county in Texas, formed in 1858 with Mason as its seat.
- Founded1858
- County seatMason
- Named forFort Mason, Texas
- Land area929 sq mi + 3.4 sq mi water
- Population3,953 2020 Census
- Parcels mapped8,838 checked 15 October 2026
Where it is
Mason on the map of Texas
Texas has 254 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1858 from Gillespie County and Llano County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Mason County was created on January 22, 1858, from Gillespie County and Llano County, and named after Fort Mason. The county was fully organized on August 2, 1858. Menard County was attached to Mason for judicial purposes in 1860, then fully organized and detached in 1871.
- 1858Mason County created Mason created from Gillespie, Llano, and Bexar Land District; Mason not fully organized. · Texas Laws 1857, 7th leg., ch. 55, sec. 2/pp. 58-59
- 1858Changed Mason fully organized. · Kennedy, 134
- 1860Changed Menard attached to Mason "for all judicial purposes." · Texas Laws 1859, 8th leg., reg. sess., gen., ch. 87, sec. 7/p. 120
- 1871
Land and parcels
What the maps cover in Mason
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 8,838 parcels from Mason County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 15 October 2026 · checked 15 October 2026 -
Address points Official
One point per address, 4,078 in all from Texas Geographic Information Office (TxGIO, formerly TNRIS), a division of the Texas Water Development Board; StratMap program.
checked 14 October 2026 -
Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- 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
Mason by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Mason County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Mason County.
See your own lot on these maps
Open Mason 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.
Questions
Common questions about Mason County
- When was Mason County founded?
- Mason County was founded in 1858, formed from Gillespie County and Llano County, and named after Fort Mason, Texas.
- What is the county seat of Mason County?
- The county seat of Mason County is Mason.
- Is there an online parcel map for Mason County?
- Yes. Mason County publishes a parcel map of 8,838 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Mason County's boundary or name changed?
- Mason County was created in 1858 from Gillespie County and Llano County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Menard County.
- Is my lot in a flood zone?
- We do not have flood maps for Mason County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby