Adair is an unincorporated community and census-designated place in McDonough County, Illinois, United States. It is part of New Salem Township. As of the 2020 census, Adair had a population of 212. Adair was laid out in August 1870 under the name of "Reedyville"; though the name has never been officially changed, the location is known as Ad…Adair is an unincorporated community and census-designated place in McDonough County, Illinois, United States. It is part of New Salem Township. As of the 2020 census, Adair had a population of 212. Adair was laid out in August 1870 under the name of "Reedyville"; though the name has never been officially changed, the location is known as Adair because that name was given to the post office.
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