McClain County
Location within the U.S. state of Oklahoma
Oklahoma's location within the U.S.
Coordinates: 35°00′N 97°26′W / 35°N 97.44°W / 35; -97.44
Country United States
State Oklahoma
Largest cityNewcastle
 • Total580 sq mi (1,500 km2)
 • Land571 sq mi (1,480 km2)
 • Water9.6 sq mi (25 km2)  1.6%%
 • Total34,506
 • Estimate 
 • Density60/sq mi (20/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district4th

McClain County is a county located in south central Oklahoma. As of the 2010 census, the population was 34,506.[1] Its county seat is Purcell.[2] The county was named for Charles M. McClain, an Oklahoma constitutional convention attendee.[3]

McClain County is part of the Oklahoma City, OK Metropolitan Statistical Area.


The Chickasaw tribe began moving into this area in 1837, when the land had already been assigned to the Choctaws by the U.S. government. In 1855, the area became part of the Chickasaw Nation, after the two tribes officially separated. The present McClain County became part of Pontotoc County, Chickasaw Nation and remained such until Oklahoma attained statehood. Few Chickasaws lived here because of hostilities with western tribes (e.g., Kiowa). Major Richard Mason established Camp Holmes (also called Camp Mason) in 1835, near the present city of Lexington, while negotiating a treaty between the western tribes and the newly arrived Choctaws. Federal troops abandoned the camp in August 1835, after the Treaty of Camp Holmes was signed.[3]

Auguste Pierre Chouteau built a trading post at the Camp Holmes site, but it closed after Chouteau died in 1838. Randolph Marcy is credited with bringing the California Road through this area in 1849. The U.S. Army built Camp Arbuckle in 1850 to protect the road, but the troops were withdrawn to what is now Garvin County, Oklahoma in the following year.[3]

Jesse Chisholm also operated a trading post in this area around 1850. A group of Delaware Indians occupied the former camp, then known as Beaversville, but left before the outbreak of the Civil War.[3]

Montford T. Johnson, a rancher, moved to this area after the Civil War. He and Jesse Chisholm, who acted as the negotiator, obtained an agreement with the Chickasaw leaders to allow ranching on their land, provided no whites were employed. Thereafter, Johnson built a ranch and hired a Chickasaw freedman to operate it. He then established other ranches and hired another freedman to run those.[3]

The Southern Kansas Railway built a line south from Kansas to present McClain County in 1886–7, and the Gulf, Colorado and Santa Fe Railway (both of which were controlled by the Atchison, Topeka and Santa Fe Railway, AT&SF) built a line north from Texas, meeting at and founding the town of Purcell. Eastern Oklahoma Railroad (later acquired by the AT&SF) laid tracks in 1900-04 from Newkirk to Pauls Valley, passing through eastern McClain County. In 1906 the Oklahoma Central Railway (sold to AT&SF in 1914) built a line that traversed McClain County from the southeast to the northwest. It ran through Byars and Purcell, and established Washington, Cole, and Blanchard.[3]

Purcell was a starting point for the Land Run of 1889. It also was at the dividing line between Indian Territory, where alcohol could not be sold, and Oklahoma Territory, where alcohol sale was legal. The town of Lexington, across the river from Purcell, had numerous saloons. In 1899, the Purcell Bridge Company built a toll bridge across the river, profiting from the alcohol trade.[3]


Map of McClain County
Map of McClain County

According to the U.S. Census Bureau, the county has a total area of 580 square miles (1,500 km2), of which 571 square miles (1,480 km2) is land and 9.6 square miles (25 km2) (1.6%) is water.[4] The county lies largely in the Red Bed Plains region of the Osage Plains. The western part of the county is hilly and covered with black jack oak trees, while the eastern part is level lowlands. The South Canadian River forms the northern border, The Washita River flows through the southwestern corner, and is fed by several McClain County creeks.[3]

Adjacent counties


Historical population
Census Pop.
2019 (est.)40,474[5]17.3%
U.S. Decennial Census[6]
1790-1960[7] 1900-1990[8]
1990-2000[9] 2010-2019[1]
Age pyramid for McClain County, Oklahoma, based on census 2000 data.
Age pyramid for McClain County, Oklahoma, based on census 2000 data.

As of the 2010 United States Census, there were 34,506 people, 12,891 households, and 9,785 families residing in the county. The population density was 59.5 people per square mile (23/km2). There were 13,996 housing units at an average density of 24 per square mile (9.3/km2). The racial makeup of the county was 84.5% white, 0.7% black or African American, 6.4% Native American, 0.4% Asian, less than 0.1% Pacific Islander, 2.7% from other races, and 5.3% from two or more races. Seven percent of the population were Hispanic or Latino of any race.

There were 12,891 households, out of which 37.4% included children under the age of 18, 61.3% were married couples living together, 9.9% had a female householder with no husband present, 4.7% had a male householder with no wife present, and 24.1% were non-families. Individuals living alone accounted for 20.1% of households and individuals 65 years of age or older living alone accounted for 8.1%. The average household size was 2.66 and the average family size was 3.06.

In the county, the population was spread out, with 26.6% under the age of 18, 6.9% from 18 to 24, 25.7% from 25 to 44, 27.6% from 45 to 64, and 13.2% who were 65 years of age or older. The median age was 38.2 years. For every 100 females, there were 98.5 males. For every 100 females age 18 and over, there were 95.4 males.

The median income for a household in the county was $56,126, and the median income for a family was $67,948. Males had a median income of $42,262 versus $32,821 for females. The per capita income for the county was $24,898. About 8% of families and 12% of the population were below the poverty line, including 11% of those under age 18 and 8% of those age 65 or over.


Voter Registration and Party Enrollment as of January 15, 2019[10]
Party Number of Voters Percentage
Democratic 6,747 28.44%
Republican 13,651 57.54%
Others 3,327 14.03%
Total 23,725 100%
Presidential elections results
Presidential elections results[11]
Year Republican Democratic Third parties
2020 79.5% 15,295 18.6% 3,582 1.9% 359
2016 78.1% 13,169 17.2% 2,894 4.7% 795
2012 77.7% 11,112 22.3% 3,194
2008 75.9% 11,193 24.1% 3,551
2004 72.9% 10,041 27.2% 3,742
2000 64.1% 6,750 34.9% 3,679 1.0% 110
1996 46.2% 4,363 39.8% 3,753 14.0% 1,323
1992 40.6% 4,377 31.4% 3,378 28.0% 3,021
1988 56.4% 4,771 42.5% 3,594 1.0% 88
1984 69.8% 6,056 29.4% 2,549 0.8% 67
1980 56.9% 4,284 39.7% 2,990 3.4% 259
1976 37.2% 2,444 61.6% 4,048 1.2% 80
1972 73.2% 4,241 23.3% 1,350 3.6% 206
1968 37.0% 2,047 33.3% 1,842 29.8% 1,647
1964 31.1% 1,638 69.0% 3,638
1960 51.9% 2,547 48.2% 2,365
1956 41.1% 2,081 58.9% 2,981
1952 42.1% 2,326 57.9% 3,201
1948 20.8% 908 79.2% 3,451
1944 31.1% 1,492 68.8% 3,301 0.2% 8
1940 33.0% 1,862 66.8% 3,768 0.2% 11
1936 22.5% 1,191 77.2% 4,092 0.3% 17
1932 13.9% 818 86.2% 5,087
1928 55.1% 2,399 43.9% 1,913 1.0% 44
1924 30.7% 1,233 62.8% 2,519 6.5% 259
1920 40.3% 1,733 53.9% 2,315 5.8% 250
1916 25.0% 680 56.7% 1,541 18.2% 495
1912 25.6% 583 56.0% 1,273 18.4% 419


The county economy has been based primarily on agriculture and cattle raising. Each town had its own cotton gin early in the 1900s. Purcell had a flour mill. Otherwise, there was little industrial activity. Many county residents commute to work in the Oklahoma City area. Mid-America Area Vo-Tech opened in 1971 to provide vocational education to students. Duke Energy North America built a power plant (which it sold to NRG Energy, Inc., that year) near Newcastle in 2001. The Chickasaw Nation operated a gaming casino at Newcastle.[3]


Pioneer Library System operates branch libraries in nine cities in Cleveland, McClain and Pottawatomie counties.[12] The Purcell Public Library at 919 N. 9th Street in Purcell is the only library in McClain County that is part of the Pioneer System.


Major highways

The busiest highway in the county is Interstate 35, which enters the county on the north at Goldsby on the McCall Bridge. It then parallels the Canadian River through the county seat, Purcell. It eventually turns southward and leaves the county at its border with Garvin County.

Another important interstate highway is Interstate 44, which runs through the northwestern part of the county. The H.E. Bailey Turnpike Norman Spur connects this highway to the US-62/US-277/SH-9 intersection.

SH-9 enters McClain County via the McCall bridge, duplexed with I-35, and immediately turns due west, running along the northern edge of Goldsby until its intersection with U.S. Highway 62/U.S. Highway 277, south of Newcastle, Oklahoma. From this intersection the three highways continue southwest towards Blanchard and further on to Chickasha in Grady County.

County roads

Like many counties, McClain County contains an extensive network of county-maintained roads. They form a grid with parallel roads generally placed 1 mile apart.

To dispel confusion and assist the small cities introducing new 9-1-1 systems, the county road system was recently renamed and signed throughout the county. East–west roads are numbered, with 100th St. located along the southern edge of the county, and the numbers gradually increasing toward the northern tip of the county. North–south streets are named, generally indicating the name of the road in the Oklahoma City grid that the county road best aligns with. (e.g. Santa Fe Avenue would, if extended northward, eventually connect with the street of the same name in Oklahoma City.)


Contaminated water supply

In 2010, the EPA ordered local water utilities to begin the first nationwide tests for hexavalent chromium 6 (AKA The Erin Brockovich Chemical). From 2013 to 2015, utilities took more than 60,000 samples of drinking water and found chromium-6 in more than 75 percent of them.[13] The Purcell water supply tested positive for an average of 11.53ppb, 577 times the original recommendation from the scientists at the respected and influential California Office of Environmental Health Hazard Assessment of 0.02ppb.[14]


Local landmarks

Main article: National Register of Historic Places listings in McClain County, Oklahoma

The following sites in McClain County are listed on the National Register of Historic Places:


  1. ^ a b "State & County QuickFacts". United States Census Bureau. Archived from the original on June 6, 2011. Retrieved November 9, 2013.
  2. ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
  3. ^ a b c d e f g h i O'Dell, Larry. "McClain County," Encyclopedia of Oklahoma History and Culture, Oklahoma Historical Society, 2009. Accessed April 4, 2015.
  4. ^ "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Retrieved February 21, 2015.
  5. ^ "County Population Totals and Components of Change: 2010-2019". United States Census Bureau. Retrieved March 25, 2020.
  6. ^ "U.S. Decennial Census". United States Census Bureau. Archived from the original on April 26, 2015. Retrieved February 21, 2015.
  7. ^ "Historical Census Browser". University of Virginia Library. Retrieved February 21, 2015.
  8. ^ Forstall, Richard L., ed. (March 27, 1995). "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved February 21, 2015.
  9. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. April 2, 2001. Retrieved February 21, 2015.
  10. ^ "Oklahoma Registration Statistics by County" (PDF). January 15, 2019. Retrieved February 27, 2019.
  11. ^ Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". Retrieved March 29, 2018.
  12. ^ "Pioneer Library System to buy Borders bookstore building in Norman". NewsOK. The Oklahoman. September 27, 2011. Retrieved October 25, 2011.
  13. ^ "Occurrence data unregulated contaminant monitoring rule #3".
  14. ^ "U.S. EPA, Occurrence Data for the Unregulated Contaminant Monitoring Rule. April 2016".

Coordinates: 35°00′N 97°26′W / 35.00°N 97.44°W / 35.00; -97.44