Washington County is a regional economic, educational, and cultural hub in the Northwest Arkansas region. Created as Arkansas's 17th county on November 30, 1848, Washington County has 13 incorporated municipalities, including Fayetteville, the county seat, and Springdale. The county is also the site of small towns, bedroom communities, and unincorporated places. The county is named for George Washington, the first President of the United States. Located within the Ozark Mountains, the county is roughly divided into two halves: the rolling Springfield Plateau in the more populous north of the county and the steeper, forested Boston Mountains in the much less populated south. It contains three segments of the Ozark National Forest, two state parks, two Wildlife Management Areas, the Garrett Hollow Natural Area, and dozens of city parks. Other historical features such as Civil War battlefields, log cabins, one-room school houses, community centers, and museums describe the history and culture of Washington County. Washington County occupies 951.72 square miles (243,220 ha) and contained a population of 245,871 people in 89,249 households as of the 2020 Census, ranking it 4th in size and 3rd in population among the state's 75 counties.
Arkansas College and Cane Hill College were both founded in Washington County within a day of each other in 1834, with the University of Arkansas being founded in Fayetteville in 1871. The county witnessed major battles during the American Civil War, including the Battle of Fayetteville, the Battle of Prairie Grove, and the Battle of Cane Hill. The county then was sparsely settled and the residents were divided in their allegiance, since it had few enslaved people, plantations almost nonexistent, and political news came by White River travelers, not from the pro-Confederate southern part of the state. A Butterfield Overland Mail route was established through the county in 1858, causing more families to settle there.
left|thumb|upright|Heritage apple tree near Woolsey farmstead, Fayetteville
The economy of Washington County was based on apples in the late 19th century. A mixture of wet weather, altitude, and loamy soils provided a good environment for apple orchards. First planted in areas around Lincoln, Evansville, and Cane Hill in the 1830s, apple orchards began all across the county. The United States Census reported a crop of 614,924 bushels of apples produced by the county in 1900, the highest in the state. Several varieties of apple were discovered in the area including Shannon Pippin, Wilson June, and most notably the Arkansas Black. The Ben Davis became the apple of choice in the area for sale and shipment across the region. Corn became the dominant crop, outselling apples by almost $500,000 in 1900.
right|thumb|[[Cane Hill College was founded in Cane Hill one day after Arkansas College in Fayetteville. It was in operation from 1834 to 1891.]]
Arkansas Industrial University was founded in the growing community of Fayetteville in 1871 after William McIlroy a donated farmland for the site. The university changed its name in 1899 to the University of Arkansas. Railroads came to Washington County after the St. Louis – San Francisco Railway (Frisco) decided to build a line to Texas through Fort Smith. Two possible routes were proposed, one passing through Prairie Grove, the other through Fayetteville. Many Fayetteville residents and farmers sold or donated land for the right of way to influence the choice. They were successful and in 1881 the first passenger train arrived at Fayetteville. The county continued to grow with more churches and schools after the railroad's completion. Rural parts of the county began losing population in the 1920s during the Great Depression, when high taxes compelled residents to move to Fayetteville or west to Oklahoma. The rural areas later became the Ozark National Forest and Devil's Den State Park.
Washington County has a total area of , of which is land and (0.6%) is water. It is the fourth-largest county by area in Arkansas.
|group=Note Washington County is surrounded by Benton County to the north, rural Madison County to the east, the rural Crawford County to the south, and Adair County, Oklahoma to the west.
Geology
Washington County sits on a basement of Precambrian granite and rhyolite, as most of the continental interior of the United States does. Much of the county's geologic history must be inferred from nearby Oklahoma and Missouri research, due to the steepness of the more recently formed mountains that did not form in the neighboring states. This igneous material was eroded until the Paleozoic, when oceans covered the now-low-lying area. These oceans came and retreated for 300 million years, depositing various different sediments during that time. This created fossiliferous limestone and ripple marked-sandstone, both present throughout the north part of the county as evidence of ancient oceans. The Devonian brought mostly shales, the Mississippian brought the limestones and chert visible in the bluffs. This chert is present throughout most of the county. The county is also home to the Boone Formation (red soils), white limestones, the Wedington Sandstone, the Bastesville Sandstone, the Pitkin formation (ocean-fossil limestone), and the Fayetteville Shale.
Settlers were attracted to the area by its numerous streams, used to power gristmills, sandstones and clays for use in construction, lime-sweetened soil, and chert for road construction.
Today, Washington County consists of two main formations, the Boston Mountains and the Springfield Plateau. During the late Pennsylvanian, sediments were deposited on top of the Springfield Plateau. The area was uplifted during the Ouachita orogeny and subsequent erosion formed the rugged Boston Mountains. Erosion of these sediments causes the Boston Mountains to be carved steeply in the south, while in the north of the county, the Boston Mountain sediments are almost entirely eroded, exposing the older rocks of the Springfield Plateau.
Hydrology
right|thumb|[[White River Bridge at Elkins]]
Washington County fits within three regional watersheds: the eastern half drains to the White River (or Beaver Lake) and the west drains to the Illinois River, with a small segment in the south draining to the Arkansas River via the Lee Creek watershed. Within the county, Clear Creek, Moore's Creek, Richland Creek, and Spring Creek are important watercourses. The county also contains eleven natural springs listed by the United States Geological Survey Board on Geographic Names, including Elkhorn Springs, Elm Springs, and Greathouse Spring in Johnson.
As a mountainous county, it contains only one natural lake and several reservoirs. Most of these reservoirs, such as Lake Prairie Grove and Lincoln Lake were created for flood control or water supplies in the 20th century. Beaver Lake, located mostly in Benton County with reaches extending into Washington and Madison counties, is the sixth-largest lake in Arkansas, and a source of recreation, tourism, and drinking water for the Northwest Arkansas region. Washington County also contains Lake Wedington, located in the Ozark National Forest west of Fayetteville on Highway 16.
Protected areas
thumb|upright|Waterfall at Devil's Den SP
Washington County contains three discontinuous segments of the Ozark National Forest, two state parks, two Wildlife Management Areas (WMAs) under Arkansas Game and Fish Commission jurisdiction, the Garrett Hollow Natural Area, and dozens of city parks.
The Wedington WMA is a hardwood forest owned by the United States Forest Service known for archery, deer hunting, fishing, and boating on Lake Wedington. The southeast corner of Washington County contains part of the White Rock WMA, an expansive section of the Ozark National Forest containing some of the steepest segments of the Boston Mountains covered in a mix of shortleaf pine and hardwood forest. White Rock WMA has six camping areas, four lakes, and numerous trails. Public hunting for squirrels, deer, wild turkeys, and black bear is available during certain seasons
Devil's Den State Park in southern Washington County is known for its picturesque views and mountain vistas. Prairie Grove Battlefield State Park was the site of the Battle of Prairie Grove, fought December 7, 1862, in the American Civil War. The park offers tours of the battlefield and period structures and contains the Hindman Museum, which preserves artifacts and interprets the history of the battle. Arkansas's largest Civil War battle reenactment takes place on t he battlefield in December of even numbered years.
Demographics
Racial and ethnic composition
{| class="wikitable" style="text-align:center;"
|+Washington County, Arkansas – Racial and ethnic composition<br /><small></small>
!Race / Ethnicity <small>(NH = Non-Hispanic)</small>
!Pop 2000
!Pop 2010
!
!% 2000
!% 2010
!
|-
|White alone (NH)
|133,368
|150,546
|style='background: #ffffe6; |160,566
|84.56%
|74.14%
|style='background: #ffffe6; |65.30%
|-
|Black or African American alone (NH)
|3,408
|5,828
|style='background: #ffffe6; |8,330
|2.16%
|2.87%
|style='background: #ffffe6; |3.39%
|-
|Native American or Alaska Native alone (NH)
|1,839
|2,154
|style='background: #ffffe6; |2,443
|1.17%
|1.06%
|style='background: #ffffe6; |0.99%
|-
|Asian alone (NH)
|2,396
|4,372
|style='background: #ffffe6; |5,631
|1.52%
|2.15%
|style='background: #ffffe6; |2.29%
|-
|Pacific Islander or Native Hawaiian alone (NH)
|820
|4,100
|style='background: #ffffe6; |8,734
|0.52%
|2.02%
|style='background: #ffffe6; |3.55%
|-
|Other race alone (NH)
|114
|227
|style='background: #ffffe6; |729
|0.07%
|0.11%
|style='background: #ffffe6; |0.30%
|-
|Mixed race or Multiracial (NH)
|2,838
|4,380
|style='background: #ffffe6; |14,683
|1.80%
|2.16%
|style='background: #ffffe6; |5.97%
|-
|Hispanic or Latino (any race)
|12,932
|31,458
|style='background: #ffffe6; |44,755
|8.20%
|15.49%
|style='background: #ffffe6; |18.20%
|-
|Total
|157,715
|203,065
|style='background: #ffffe6; |245,871
|100.00%
|100.00%
|style='background: #ffffe6; |100.00%
|}
2020 census
As of the 2020 census, the county had a population of 245,871. The median age was 32.0 years. 23.7% of residents were under the age of 18 and 12.1% of residents were 65 years of age or older. For every 100 females there were 98.7 males, and for every 100 females age 18 and over there were 96.5 males age 18 and over.
The racial makeup of the county was 68.5% White, 3.5% Black or African American, 1.5% American Indian and Alaska Native, 2.3% Asian, 3.6% Native Hawaiian and Pacific Islander, 10.2% from some other race, and 10.5% from two or more races. Hispanic or Latino residents of any race comprised 18.2% of the population.
There were 92,548 households in the county, of which 31.7% had children under the age of 18 living in them. Of all households, 44.5% were married-couple households, 21.0% were households with a male householder and no spouse or partner present, and 26.5% were households with a female householder and no spouse or partner present. About 27.9% of all households were made up of individuals and 8.1% had someone living alone who was 65 years of age or older. there were 203,065 people, 76,389 households, and 48,059 families residing in the county. The population density was . There were 87,808 housing units at an average density of . The racial makeup of the county was 79.9% White, 3.0% Black or African American, 1.2% Native American, 2.2% Asian, 2.0% Pacific Islander, 8.9% from other races, and 2.8% from two or more races. 15.5% of the population were Hispanic or Latino of any race.
There were 76,389 households, out of which 30.9% had children under the age of 18 living with them, 47.4% were married couples living together, 10.6% had a female householder with no husband present, and 37.1% were non-families. 27.5% of all households were made up of individuals, and 6.9% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 3.18.
2000 census
As of the 2000 United States census, there were 157,715 people, 60,151 households, and 39,459 families residing in the county. The population density was . There were 64,330 housing units at an average density of . The racial makeup of the county was 88.00% White, 2.24% Black or African American, 1.25% Native American, 1.54% Asian, 0.53% Pacific Islander, 4.26% from other races, and 2.17% from two or more races. 8.20% of the population were Hispanic or Latino of any race.
There were 60,151 households, out of which 32.50% had children under the age of 18 living with them, 52.30% were married couples living together, 9.40% had a female householder with no husband present, and 34.40% were non-families. 25.80% of all households were made up of individuals, and 7.10% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.07.
In the county, the population was spread out, with 25.00% under the age of 18, 15.30% from 18 to 24, 30.20% from 25 to 44, 19.50% from 45 to 64, and 9.90% who were 65 years of age or older. The median age was 31 years. For every 100 females, there were 100.40 males. For every 100 females age 18 and over, there were 98.70 males.
The median income for a household in the county was $34,691, and the median income for a family was $42,795. Males had a median income of $29,428 versus $21,769 for females. The per capita income for the county was $17,347. About 9.40% of families and 14.60% of the population were below the poverty line, including 16.50% of those under age 18 and 10.20% of those age 65 or over.
2023 American Community Survey 5-Year Estimates
The United States Census Bureau also conducts estimated annual counts based on sampling for all jurisdictions. Due to the margin of error, it is not directly comparable to the decennial census.
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