USDA National Agricultural Statistics Service
Data on farms, agricultural workers, crops, livestock, and more. Data can be found under both "Data and Statistics" and "Census." ("Census" points to the Census of Agriculture, which surveys all farms in the United States once every five years.)
World Food Programme Food Aid Information System
Data on international food aid, 1988-present.
United Nations Food and Agriculture Organization
Statistics and data on land use, water use, agriculture, fisheries, forestry, nutrition, and food aid. Also includes a spatial database of agricultural land-use data with online mapping capabilities.
World Food Situation
Datasets and statistics on food prices, supply and demand briefings, crop markets and commodities from the United Nations Food and Agriculture Organization website.