Is there a minimum credit score?

This answer depends largely upon the type of mortgage you are trying to obtain. The most attractive and most common type of mortgage financing is FNMA & FHLMC also known as agency paper. To get an agency approval, the rumored acceptable credit score is 620. This can vary widely depending on other factors when underwriting the buyer (down payment, income, liquid assets...). To offer a range, consider the following: below 620 is poor, 620-650 marginal, 650-680 nothing special, 680-700 fairly good, 700-720 good, 720-750 very good, above 750 is excellent. Many loans are closed every day with credit scores less than 620. More than likely they are not on agency paper. Alternatives to agency paper are government loans (FHA & VA) and sub-prime money.