Agriculture - Number of farms (1) To resort data: click column headings. To download data: click here. County Name Total number of farms Rank Total number of farms Percent of Idaho's farms Source: 2002-2017: USDA, National Agricultural Statistics Service - 2002, 2007, 2012, 2017 Census of Agriculture (https://www.agcensus.usda.gov/); DATE LAST UPDATED: April 15, 2019.