The district is located in central Roi Et province.
The district was created in 1897, at first named Sabut (สระบุศย์). In 1913 it was renamed to At Samat.
In January 2006 prime minister Thaksin Shinawatra chose At Samat as the model district for his poverty eradication mission. He visited the district and led a five-day workshop. The whole event was shown as a reality TV show named Backstage: The Prime Minister.
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