County · code 48455
Trinity CountyTexas
Trinity County is a county in Texas with its county seat in Groveton. The county was established on February 11, 1850, and named after the Trinity River.
- Founded1850
- County seatGroveton
- Named forTrinity River, Texas
- Land area694 sq mi + 20 sq mi water
- Population13,602 2020 Census
- Parcels mapped26,001 checked 15 October 2026
Where it is
Trinity 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 1850 from Houston County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Trinity County was created from Houston County on February 11, 1850, though it was not fully organized until April 1 of that year. The county lost territory to Walker County in 1858 and to Polk County in 1875.
- 1850Trinity County created Trinity created from Houston; Trinity not fully organized. · Texas Laws 1849, 3d leg., reg. sess., ch. 160/p. 201
- 1850Changed Trinity fully organized. · Kennedy, 165
- 1858
- 1875
Land and parcels
What the maps cover in Trinity
Who publishes each layer, how good it is, and when we last checked.
-
Parcels Good enough
Lot lines and tax-map numbers for 26,001 parcels from Trinity 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, 13,792 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
Trinity 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
Who to ask before you build, dig or sell
Official county pages only. We link to them; we do not copy them, because they change.
GIS and maps
County government
- County government
The official website of Trinity County.
See your own lot on these maps
Open Trinity 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 Trinity County
- When was Trinity County founded?
- Trinity County was founded in 1850, formed from Houston County, and named after Trinity River, Texas.
- What is the county seat of Trinity County?
- The county seat of Trinity County is Groveton.
- Is there an online parcel map for Trinity County?
- Yes. Trinity County publishes a parcel map of 26,001 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Trinity County's boundary or name changed?
- Trinity County was created in 1850 from Houston County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Polk County and Walker County.
- Is my lot in a flood zone?
- We do not have flood maps for Trinity County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby