Prehistoric cultural affiliation(s) include Trinity Aspect, La Harpe Aspect, Edwards Plateau Aspect, Native American (Archaic) and European American dating back to 6999 BC.
The famous person Lowell Sr. Smith is associated with one of more of the Johnson County historic places.
Some of the country's most noteable architects helped create the Johnson County places including Lang & Witchell, American Construction Co., John Wesley Smith, Smith & Moore, George Wilson and Zimmerman & McCoy. Prominent architectural styles found in Johnson Country are Beaux Arts, Classical Revival and Early Commercial.