County · code 48111
Dallam CountyTexas
Dallam County is a county in Texas, on the border with New Mexico and Oklahoma, founded in 1876, with its seat at Dalhart.
- Founded1876
- County seatDalhart
- Named forJames Wilmer Dallam
- Land area1,503 sq mi + 2 sq mi water
- Population7,115 2020 Census
- Parcels mapped6,619 checked 14 October 2026
Where it is
Dallam 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 1876 from Jack County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Dallam County was created from Bexar Territory on November 19, 1876, but was not fully organized at that time. For the next fifteen years, Dallam County was attached to neighboring counties—Jack, Wheeler, Oldham, and then Hartley—for judicial purposes. The county became fully organized and independent on July 28, 1891.
- 1876Dallam County created Dallam created from Bexar Territory; Dallam not fully organized, attached to Jack "for judicial, surveying and all other purposes." Act passed 21 August 1876; took effect 19 November 1876. · Texas Laws 1876, 15th leg., ch. 144/pp. 235, 242
- 1879
- 1881
- 1891
- 1891
- 1931Dallam County created Western extent of Dallam explicitly extended to the Texas-New Mexico boundary (103d meridian) as established by John H. Clark in 1859. · Texas Laws 1931, 42d leg., reg. sess., ch. 358/p. 850
Land and parcels
What the maps cover in Dallam
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 6,619 parcels. 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, 4,284 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
Dallam 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
Dallam 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 Dallam County.
See your own lot on these maps
Open Dallam 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 Dallam County
- When was Dallam County founded?
- Dallam County was founded in 1876, formed from Jack County, and named after James Wilmer Dallam.
- What is the county seat of Dallam County?
- The county seat of Dallam County is Dalhart.
- Is there an online parcel map for Dallam County?
- Yes. A public source publishes a parcel map of 6,619 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Dallam County's boundary or name changed?
- Dallam County was created in 1876 from Jack County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Hartley County, Oldham County and Wheeler County.
- Is my lot in a flood zone?
- We do not have flood maps for Dallam County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby