Taken from "theHorse.com" Article # 15173
by: Les Sellnow
Poole offers the following history concerning how the U.S. Census of Agriculture has defined a farm through the years:
1850-1869 $100 in agriculture product sales;
1870-1899 $500 in sales, or three acres;
1900-1909 One full-time person;
1910-1924 $250 in sales, three acres, or one full-time person;
1925-1949 $250 in sales or three acres;
1950-1958 $250 and three acres, or $250 in sales;
1959-1974 $50 and 10 acres, or $250 in sales; and
1975-present $1,000 in sales.
This is an interesting article. I wish I could come close to qualifying! Lots of good stuff available at this site for all you horse lovers or wannabees.