(From a USDA Blog announcement):
In celebration of 150 years of service to American agriculture, the USDA’s National Agricultural Statistics Service (NASS), in partnership with Cornell University’s Mann Library, are making past Census of Agriculture reports data and many other historical facts available online at http://agcensus.mannlib.cornell.edu.
The Census of Agriculture reports contain aggregate data, on the county-, state- and national-level, for almost every facet of American agriculture, including number of farms, acres of farmland, totals for agricultural production, value of farm production, demographics and much more. The census reports are popular resources used by researchers, historians, genealogists, law professionals and others who want to know more about American agriculture and how the industry has expanded and changed over time.