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County · code 05131

Sebastian CountyArkansas

Sebastian County is a county in Arkansas with its seat in Fort Smith and Greenwood. It was created on January 6, 1851, from Crawford, Scott, and Polk counties.

  • Founded1851
  • County seatFort Smith and Greenwood
  • Land area531 sq mi + 13 sq mi water
  • Population127,799 2020 Census
  • Parcels mapped60,283 checked 14 October 2026
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Updated

CrawfordScottFranklinLe Flore, OKLoganSequoyah, OK Fort Smith and Greenwood Census outline · seat marked

Where it is

Sebastian on the map of Arkansas

Arkansas has 75 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Arkansas · Sebastian highlighted

History

Formed in 1851 from Crawford County, Scott County and Polk County

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

Sebastian County was created from Crawford, Scott, and Polk counties in 1851. In 1861, the county lost territory to Scott County and a small area to Polk County. By 1887 and 1890, Sebastian exchanged small areas with Franklin and Scott counties as boundaries were adjusted. In 1905, Congress approved an act that gave Sebastian County approximately 130 acres from Indian Territory along the Poteau River, which became part of Oklahoma.

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

  1. 1851
    Sebastian County created Sebastian created from Crawford, Scott, and a small area of Polk.
    from Crawfordfrom Scottfrom Polk
    · Ark. Acts 1850, 8th sess., pp. 81-85
  2. 1861
    Lost territory Sebastian lost to Scott and lost small area to Polk.
    to Scottto Polk
    · Ord. of State Convention 1861, 70-71; "Pruitt v. Sebastian County Coal Co.," in Ark. Rpts., 215: 673-689
  3. 1887
    Exchanged territory By 1887, Sebastian exchanged small areas with Franklin.
    with Franklin
    · Outline Map of Sebastian Co., 1887; U.S.G.S., "Fort Smith Sheet," 1887, ed. of 1890
  4. 1890
    Exchanged territory By 1890, Sebastian exchanged with Scott when boundary was placed on public land survey lines.
    with Scott
    · Outline Map of Sebastian Co., 1887; U.S.G.S., "Fort Smith Sheet," 1887, ed. of 1890
  5. 1905
    Gained territory Sebastian gained approximately 130 acres from Indian Territory (now Oklahoma) along the Poteau River when the U.S. Congress changed the western boundary of Arkansas. Congressional act was approved 10 February 1905.
    from U.s.
    · Ark. Acts 1905, 35th sess., nos. 41, 87/pp. 124-125, 212-213; Morris, Goins, and McReynolds, 61; U.S. Stat., vol. 33, ch. 571[1905]/pp. 714-715; Van Zandt, 120

Land and parcels

What the maps cover in Sebastian

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

Sebastian by the Census

Population
127,799 2020 Census count
Housing units
56,749 2020 Census count
Land area
531 square miles
Water area
13 square miles
People per sq mi
241 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

Sebastian County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Sebastian 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 Sebastian County

When was Sebastian County founded?
Sebastian County was founded in 1851, formed from Crawford County, Scott County and Polk County.
What is the county seat of Sebastian County?
The county seat of Sebastian County is Fort Smith and Greenwood.
Is there an online parcel map for Sebastian County?
Yes. Arkansas GIS Office publishes a parcel map of 60,283 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Sebastian County's boundary or name changed?
Sebastian County was created in 1851 from Crawford County, Scott County and Polk County. Since then the Atlas of Historical County Boundaries records 4 later changes, most of them small boundary adjustments, chiefly involving Scott County, Franklin County and Polk County.
Is my lot in a flood zone?
We do not have flood maps for Sebastian 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