the economic importance of agri food industries in iowa a report for coalition to support s farmers by mark imerman david swenson liesl eathington daniel otto department economics state university ames 50011 september 16 2005 ii executive summary there were 90 655 farms 2002 these included 31 729 490 acres or 49 477 square miles land 88 7 percent area 2000 171 374 iowans 5 86 population lived on market value buildings and machinery averaged 808 000 per farm this was 33 higher than average investment nationwide us bureau analysis credited 59 jobs farming from 1990 employment generated 4 65 inflation adjusted earnings place work nearly five times greater national level ag production 3 73 gross product gsp fifth highest proportion nation processing