If you want to use a conventional mortgage loan to buy a house, you will probably need a credit score of 620 or higher. In 2012, we've been seeing some lenders set the bar even higher, at 640. When using a government-backed loan (such as an FHA or VA loan), you might get approved with a score below that range.
There's only one way to find out if you're qualified for a mortgage loan. You have to apply. You can start the process online and I would be happy to put you in touch with a qualified mortgage broker.