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County · code 48165

Gaines CountyTexas

Gaines County is a county in Texas with its seat in Seminole, formed in 1876.

  • Founded1876
  • County seatSeminole
  • Land area1,502 sq mi + 0.5 sq mi water
  • Population21,598 2020 Census
  • Parcels mapped17,964 checked 14 October 2026
Open the free map Click any parcel in Gaines County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

AndrewsYoakumDawson Seminole Census outline · seat marked

Where it is

Gaines on the map of Texas

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

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Counties of Texas · Gaines highlighted

History

Formed in 1876 from Shackelford County

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

Gaines County was created from Young Territory on November 19, 1876, but was not fully organized and was attached to Shackelford County for judicial and surveying purposes. Over the following decades, Gaines County was successively attached for judicial purposes to Mitchell County in 1881, Howard County in 1883, and Martin County in 1885. The county became fully organized and independent on October 24, 1905, when it was detached from Martin County.

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

  1. 1876
    Gaines County created Gaines created from Young Territory; Gaines not fully organized, attached to Shackelford "for judicial, surveying and all other purposes." Act passed 21 August 1876; took effect 19 November 1876.
    from Shackelford
    · Texas Laws 1876, 15th leg., ch. 144/pp. 239, 242
  2. 1881
    Changed Gaines detached from Shackelford, attached to Mitchell "for judicial purposes."
    ShackelfordMitchell
    · Texas Laws 1881, 17th leg., reg. sess., ch. 74, sec. 11/p. 79
  3. 1883
    Changed Gaines detached from Mitchell, attached to Howard "for judicial purposes."
    MitchellHoward
    · Texas Laws 1883, 18th leg., reg. sess., ch. 41, sec. 1/p. 29
  4. 1885
    Changed Gaines detached from Howard, attached to Martin "for judicial purposes."
    HowardMartin
    · Texas Laws 1885, 19th leg., ch. 113, sec. 3/p. 110
  5. 1905
    Changed Gaines fully organized, detached from Martin.
    Martin
    · Kennedy, 95
  6. 1931
    Gaines County created Western extent of Gaines 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 Gaines

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

Gaines by the Census

Population
21,598 2020 Census count
Housing units
7,642 2020 Census count
Land area
1,502 square miles
Water area
0.5 square miles
People per sq mi
14 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

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.

Records

County government

See your own lot on these maps

Open Gaines 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 Gaines County

When was Gaines County founded?
Gaines County was founded in 1876, formed from Shackelford County.
What is the county seat of Gaines County?
The county seat of Gaines County is Seminole.
Is there an online parcel map for Gaines County?
Yes. Gaines County publishes a parcel map of 17,964 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Gaines County's boundary or name changed?
Gaines County was created in 1876 from Shackelford County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Howard County, Martin County and Mitchell County.
Is my lot in a flood zone?
We do not have flood maps for Gaines 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