Trumpiest county in Iowa has lost 23% of its residents since 1920

 

Trump received more than 80% of the vote in Lyon County in both 2016 and 2020.

Source:  Wikipedia (above and below)

Its residents have an education level that is 44% below the U.S. average.

% of population 25 and older with bachelor's degree:

• 19.4% - Lyon County
• 30.3% - Iowa
• 34.3% - U.S.

Johnson County is the least Trumpy county in Iowa.  It is home to the University of Iowa and has the state's highest average level of education.  Biden received 70.6% of the vote in 2020.

Sources:  Wikipedia (abvoe and below)

The number of residents living in Johnson County has increased 477% since 1920.

Its residents have an education level that is 50% above the U.S. average.

% of population 25 and older with bachelor's degree:

• 54.1% - Johnson County
• 30.3% - Iowa
• 34.3% - U.S.