Byars is a town in McClain County, Oklahoma, United States. The population was 184 at the 2020 census,
In 1903, the Oklahoma Central Railroad (OCR) was very interested in building a community one mile south of Johnsonville, where the OCR was building an east–west line. Katie Byars and her husband donated land to be used for this purpose, despite opposition from their neighbors in Johnsonville. A post office named Byars was opened on April 9, 1903. Byars incorporated in 1906, and the OCR main line reached the town site in July 1908. At statehood in 1907, Byars had an official population of 537. Purcell, the McClain county seat, is to the northwest, and Ada is to the southeast.
According to the U.S. Census Bureau, Byars has a total area of , of which are land and , or 6.53%, are water.
| align = right
| align-fn = center
2020 census
As of the 2020 census, Byars had a population of 184. The median age was 41.3 years. 25.5% of residents were under the age of 18 and 14.1% of residents were 65 years of age or older. For every 100 females there were 91.7 males, and for every 100 females age 18 and over there were 80.3 males age 18 and over.
There were 74 households in Byars, of which 35.1% had children under the age of 18 living in them. Of all households, 52.7% were married-couple households, 9.5% were households with a male householder and no spouse or partner present, and 29.7% were households with a female householder and no spouse or partner present. About 23.0% of all households were made up of individuals and 8.1% had someone living alone who was 65 years of age or older.
! Race !! Number !! Percent
|-
| White || 148 || 80.4%
|-
| Black or African American || 0 || 0.0%
|-
| American Indian and Alaska Native || 13 || 7.1%
|-
| Asian || 0 || 0.0%
|-
| Native Hawaiian and Other Pacific Islander || 0 || 0.0%
|-
| Some other race || 2 || 1.1%
|-
| Two or more races || 21 || 11.4%
|-
| Hispanic or Latino (of any race) || 9 || 4.9%
|}
2000 census
As of the census