County · code 48235
Irion CountyTexas
Irion County is a county in Texas with its seat in Mertzon, formed in 1889.
- Founded1889
- County seatMertzon
- Named forRobert Anderson Irion
- Land area1,052 sq mi
- Population1,513 2020 Census
- Parcels mapped3,567 checked 14 October 2026
Where it is
Irion 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 1889 from Tom Green County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Irion County was created from Tom Green County on March 7, 1889, though it was not fully organized until April 16, 1889. The county was named after Robert Anderson Irion.
- 1889Irion County created Irion created from Tom Green; Irion not fully organized. · Texas Laws 1889, 21st leg., ch. 87/p. 99
- 1889Changed Irion fully organized. · Crawford, 24
Land and parcels
What the maps cover in Irion
Who publishes each layer, how good it is, and when we last checked.
-
Parcels Good enough
Lot lines and tax-map numbers for 3,567 parcels from Irion County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 14 October 2026 -
Address points Official
One point per address, 1,614 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
Irion 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.
Inside a city or town, permits usually come from that city rather than the county.
Records
- Clerk of court: deeds and plats
County Clerk
Permits
- Health department: septic and well
Indigent Health Care
County government
- County government
The official website of Irion County.
See your own lot on these maps
Open Irion 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 Irion County
- When was Irion County founded?
- Irion County was founded in 1889, formed from Tom Green County, and named after Robert Anderson Irion.
- What is the county seat of Irion County?
- The county seat of Irion County is Mertzon.
- Is there an online parcel map for Irion County?
- Yes. Irion County publishes a parcel map of 3,567 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Irion County's boundary or name changed?
- Irion County was created in 1889 from Tom Green County. Since then the Atlas of Historical County Boundaries records 1 later change.
- Who issues septic and well permits in Irion County?
- The county's page on septic systems and wells: Indigent Health Care.
- Is my lot in a flood zone?
- We do not have flood maps for Irion County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby