These people surf a couple of websites and see the range of 300-850 in the charts. They assume that this is the is the gospel...lol
The fact is that this range is the range that is obtainable by average people. What they don't tell you is that few above average people can exceed this score. It's kind of like making 100% on a math test but getting extra credit to reach 125%. Most people could never ever reach over 850 and honestly they don't want people to know that it is possible, but it is! It's not going to be found on a website, but ask a credit agent, they will tell you. I have seen higher scores before. Your dad is older, and has an almost unobtainable credit score...It is possible, but almost impossible to have a FICA score that high. Most people will never have a score like that, because they don't even believe that it exists. Just like the first few people that answered your question...haha As for the highest possible rating, I am unsure. It is probably no limit at all!