Mackay is an unincorporated community in central Wharton County, in the U.S. state of Texas. The once thriving community is located on U.S. Route 59 (US 59) southwest of Wharton near Wharton Regional Airport. Mackay began as a railroad stop near a large ranch in 1881 and saw an influx of immigrants beginning in 1907. The community had its own post office from 1921 to 1937 but most of the buildings were gone by 1990. There were two businesses and a grain silo at the site in 2014.