The famous person William H. et al. Holland 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 Canton Bridge Co., Omaha Steel Works, US Department of the Treasury, Office of Supervising Architect, Edward Curran, Thomas Hutton, Robinson E.J., W.M. Butler and Edward & James Curran. Prominent architectural styles found in Johnson Country are Classical Revival, Gothic and Italianate.