Location of Cyril, Oklahoma
|• Total||0.6 sq mi (1.5 km2)|
|• Land||0.6 sq mi (1.5 km2)|
|• Water||0.0 sq mi (0.0 km2)|
|Elevation||1,365 ft (416 m)|
|• Density||1,778/sq mi (686.6/km2)|
|Time zone||Central (CST) (UTC-6)|
|• Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||1091906|
Cyril is located in southeastern Caddo County at  U.S. Route 277 passes through the town, leading northeast 23 miles (37 km) to Chickasha and southwest 28 miles (45 km) to Lawton. Oklahoma City is 66 miles (106 km) to the northeast via US 277 and Interstate 44.(34.897969, -98.202843).
As of the census of 2000, there were 1,168 people, 438 households and 307 families residing in the town. The population density was 2,028.6 per square mile (777.5/km²). There were 523 housing units at an average density of 908.3 per square mile (348.2/km²). The racial makeup of the town was 87.16% White, 0.17% African American, 9.42% Native American, 0.17% Asian, 0.51% from other races, and 2.57% from two or more races. Hispanic or Latino of any race were 2.74% of the population.
There were 438 households of which 34.2% had children under the age of 18 living with them, 53.2% were married couples living together, 13.2% had a female householder with no husband present, and 29.9% were non-families. 28.3% of all households were made up of individuals and 16.0% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 3.14.
In the town, the population was spread out with 29.4% under the age of 18, 6.8% from 18 to 24, 25.8% from 25 to 44, 17.0% from 45 to 64, and 21.1% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 84.8 males. For every 100 females age 18 and over, there were 76.7 males.
The median income for a household in the town was $27,772, and the median income for a family was $33,750. Males had a median income of $29,500 versus $16,563 for females. The per capita income for the town was $14,227. About 16.6% of families and 20.5% of the population were below the poverty line, including 30.7% of those under age 18 and 10.6% of those age 65 or over.
On August 25, 1901, Louise (probably called Cyril) Lookingglass, the infant daughter of Bayard (Monapahrah) and Laura (Tit-tah-ter-way) Lookingglass, was allotted 160 acres (0.65 km2) of land that would become the Cyril townsite. Louise Lookingglass died in 1903. Bayard Lookingglass sold one-half of the allotment to Mr. and Mrs. Pierson on July 26, 1907. The Piersons sold the land to the Cyril Townsite and Development Company on September 10, 1907.
Although there is some dispute, the Cyril Station appears to have been named circa 1902 after Bayard and Laura Lookingglasses' daughter when they granted the railroad permission to build a section house next to the railroad stop. Some believed that the town of Cyril was named after the Cyril Station of the St. Louis-San Francisco Railroad. However a diligent search of all sources including Frisco Railroad, found no supporting evidence.
The townsite was surveyed, plotted out and dedicated in September 1907. Construction began in early 1908 and by April there were 200 inhabitants, 3 hardware stores, 3 grocery stores, a general tin and pump house, restaurant, rooming house, pool hall, two barber shops, blacksmith shop, lumberyard, feed yard and feed mill.
The town was the site of an oil refinery from the early 1920s until it was closed in 1984. During that time, the refinery was operated by Anderson-Prichard Refining and later Oklahoma Refining. It was the major economic driver for the town, employing 160 people at the time of closure. An unsuccessful attempt was made in the early 1990s to restart part of the refinery. As of 2010, the refinery had been demolished and the site was a Superfund environmental cleanup site.
- "American FactFinder". United States Census Bureau. Archived from the original on 2013-09-11. Retrieved 2008-01-31.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- "Geographic Identifiers: 2010 Demographic Profile Data (G001): Cyril town, Oklahoma". U.S. Census Bureau, American Factfinder. Retrieved February 5, 2015.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "Annual Estimates of the Resident Population for Incorporated Places: April 1, 2010 to July 1, 2015". Retrieved July 2, 2016.
- "Census of Population and Housing". Census.gov. Archived from the original on May 12, 2015. Retrieved June 4, 2015.
- Bill and Darlene Patterson, A History of Cyril, June 1976
- Savage, Cynthia. "Cyril". The Encyclopedia of Oklahoma History and Culture. www.okhistory.org. Retrieved 23 September 2015.
- Vandewater, Bob (30 September 1984). "Refinery Closings Blow To 2 Oklahoma Towns". Daily Oklahoman. Retrieved 23 September 2015.
- Branson-Potts, Hailey (10 October 2010). "Loss of refinery at Cyril was hard on workers, community". The Oklahoman. Retrieved 23 September 2015.