Lamar is a town in Hughes County, Oklahoma, United States. The population was 158 at the 2010 census.

After the Missouri, Oklahoma and Gulf Railway (later the Kansas, Oklahoma and Gulf Railway (KO&G) constructed a line in 1907 connecting Dustin and Calvin, the Lamar community developed midway between the two towns. A make known office was established upon July 23, 1907. On September 14, 1907, J. R. Luttrell published the first matter of the weekly Lamar News. Two years forward-thinking Lamar had a bank, a livery, a cotton gin, a lumberyard, a tin shop, a hardware store, and five general stores. Lamar incorporated upon January 2, 1908. In 1909 R. L. Polk’s Oklahoma State Gazetteer and Business Directory estimated that Lamar had a population of five hundred. Citizens passed a ten-thousand-dollar sticking together issue in May 1909 for the construction of a two-story, brick learned building, completed in May 1910.

On July 5, 1922, Lamar became a consolidated learned district. In October of that year citizens voted by a margin of two to one to incorporate the town. After the Bank of Lamar voluntarily liquidated upon December 12, 1928, residents conducted their banking in Holdenville. During the 1940s and 1950s the town supported several groceries and gas stations.

The first federal census for Lamar reported a population of 250 in 1930. The number peaked at 296 in 1940. By 1950 it had declined to 180 and continued on a downward spiral to a low of 97 in 1990. At the outlook of the twenty-first century Lamar served as a “bedroom” community for 172 residents, the majority of whom commuted thirty to forty-five minutes to work. The 2010 census recorded 158 inhabitants.