Barnum is located in the County of Webster. A major roadway U.S. Route No. 7 is located nearby. Barnum has a total area of about 0.4 sq. miles. The School District of Manson Northwest Webster operates a number of schools in the area. This also helps a large number of residents to find employment in the education sector. The education sector also helps the residents of Barnum to get involved in other type of businesses.