Alvarado is the oldest city in Johnson County, Texas, United States. The population was 4,739 in 2020. The community's first sheriff, A. H. On…Alvarado is the oldest city in Johnson County, Texas, United States. The population was 4,739 in 2020. The community's first sheriff, A. H. Onstoott, is credited with naming Alvarado for Alvarado, Veracruz, Mexico, where he fought in a battle during the Mexican–American War.
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