Credit scores range from 300 to 850. The higher one's score, the easier it is not only to obtain a loan, but to do so at a favorable interest rate.
There are three nationwide credit reporting agencies in the USA. They assign credit scores based on factors such as your payment history, how much debt you currently have, and so forth. It is always a good idea to check your credit report with each of the agencies (the formulas they use mean scores may vary slightly from one to another) to make certain all of the information they have about you is accurate. These are the links to the three agencies:
Here are a few additional resources from the Ingram Library Collection related to loans and credit scores.
I Didn't Learn That in High School: 199 Facts about Credit Scores by