First taken in 1840, the Census of Agriculture is currently conducted by the United States Department of Agriculture (USDA) in years ending in 2 and 7. For census purposes, a farm is defined as a place from which $1,000 or more of agricultural products were produced and sold, or normally would have been sold, during the census year. The current definition has been in effect since 1974.
The census is a complete count of U.S. farms and ranches and the people who operate them. The Census looks at land use and ownerships economy.
The most recent USDA Census of Agriculture can be accessed by visiting http://www.agcensus.usda.gov/Publications/2012/