It's my understanding from the mortgage lenders I work with that the USDA loans are based on the category the specific piece of property at the time of the most recent Census; however, some entire towns qualify, perhaps because they are rural based. In that case, 2010 would be when it would happen. This also means that a house that qualifies can be next door to a house that doesn't (Sun City, Georgetown, comes to mind, where houses built before 2000 would not qualify but houses built in the areas that were still pasture in 2000 would - after the 2010 census, houses built in Sun City before 2000 won't be eligible, but those built on land that was cow pasture at that time will). I never assume about a property that might be eligible is or is not, but check the specific address on the
USDA website.