Not all Iowa farms are commercially important. There are about 21,000 nominal operations barely large enough to be called farms. Their size and production are small. Their operators either exist at a very low level of living or have supplemental income from rents, retirement or off-farm employment.
Wunderlich, Gene and Timmons, John F.
"Iowa's "Farms in Name Only","
Iowa Farm Science: Vol. 11
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol11/iss5/2