|• Total||7.0 sq mi (18.0 km2)|
|• Land||6.8 sq mi (17.7 km2)|
|• Water||0.1 sq mi (0.4 km2)|
|Elevation||1,086 ft (305 m)|
|• Density||703.10/sq mi (271.5/km2)|
|Time zone||Central (CST) (UTC-6)|
|• Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||1098617|
Sulphur is located at . According to the United States Census Bureau, the city has a total area of 7.0 square miles (18 km2), of which 6.8 square miles (18 km2) is land and 0.2 square miles (0.52 km2) (2.16%) is water.(34.509159, -96.975371)
As of the census of 2000, there were 4,794 people, 1,877 households, and 1,244 families residing in the city. The population density was 703.1 people per square mile (271.4/km²). There were 2,220 housing units at an average density of 325.6 per square mile (125.7/km²). The racial makeup of the city was 79.45% White, 1.36% African American, 12.72% Native American, 0.38% Asian, 0.04% Pacific Islander, 1.52% from other races, and 4.53% from two or more races. Hispanic or Latino of any race were 4.80% of the population.
There were 1,877 households out of which 100.0% had children under the age of 18 living with them, 49.3% were married couples living together, 12.8% had a female householder with no husband present, and 33.7% were non-families. 30.3% of all households were made up of individuals and 15.5% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.97.
In the city the population was spread out with 23.9% under the age of 18, 9.2% from 18 to 24, 25.0% from 25 to 44, 21.3% from 45 to 64, and 20.5% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 96.1 males. For every 100 females age 18 and over, there were 90.8 males.
The median income for a household in the city was $27,236, and the median income for a family was $35,000. Males had a median income of $28,712 versus $19,438 for females. The per capita income for the city was $15,691. About 7.9% of families and 12.3% of the population were below the poverty line, including 17.5% of those under age 18 and 13.5% of those age 65 or over.
The city of Sulphur is served by the Sulphur Public School District. There is one elementary, intermediate, junior high and high school. As of October 2008, the enrollment for the district was at 1,383 students.
Athletics are a major piece of the school culture in Sulphur. Football is the most popular sport, and the Bulldogs have won State Championships in class 3A (2002) and 2A (2004). They were the 3A state runner-up in 2003. Powerlifting, basketball and baseball are also popular sports. The Bulldogs have won state championships in both baseball (1966 and 2004) and powerlifting (2005 and 2006). There has been a long and heated rivalry between Sulphur and the neighboring town of Davis, OK, located just 7 miles to the west, known locally as the Murray County Bedlam.
Oklahoma School for the Deaf is also located in Sulphur, Oklahoma. They provide the same education opportunities for deaf and hard-of-hearing students as hearing students. They also participate in sports: football, volleyball, track, etc.
Chickasaw National Recreation Area (originally Platt National Park), a popular destination for many regional tourists, is located just east of the town of Sulphur. Among the smallest parks in the National Park System, Chickasaw N.R.A. averages 3–4 million visitors per year. Principal attractions in Sulphur besides the park are sulfurous springs in town that were once thought to cure ailments and other medical conditions. The pungent odor and taste are quite popular with some people. Other attractions include the Arbuckle Mountain range, just to the southwest, complete with many hiking and recreational opportunities.
- Wayne Bennett, Blues guitarist, was born in Sulphur.
- Roy Joseph Turner served as state governor from 1947 to 1951. Turner was born on November 6, 1894, in Lincoln County, Oklahoma Territory, and by 1928 he had become an independent oil producer. In 1933 he established the Turner Ranch near Sulphur, OK.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- "Find a County". National Association of Counties. Retrieved 2011-06-07.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- City of Sulphur