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I should have called the USDA office before I posted that reply......they do not accept anything below a 640 middle score.
It may depend on the USDA official you deal with and what state you live in. In IL, we were able to get approved. My husband and I actually just closed on our USDA Direct loan this morning, and neither one of us has a middle score of 640. His is 629, and mine is 624.