Generally, 630 is considered a fair credit score. Sometimes whether a 630 is considered bad or fair depends on the credit agency.
Most of the time, a credit score below 630 is considered bad, and anything between 630 to 689 is a fair credit score. Lending institutions sometimes take a 630 as long as an applicant has steady and sufficient income.
An applicant's credit score helps to determine the interest rates he is charged on everything from auto loans to credit cards. It is important to remember that each time an applicant applies for some kind of loan, it lowers his credit score.