The three major credit bureaus — Equifax, Experian, and TransUnion — generally view a FICO credit score or VantageScore in the 580-669 range as fair or average.
Typically, anything below a 670 is considered a subprime credit score. Subprime credit is viewed as a higher risk to lenders. With a 600 credit score, you may have access to alternative loan options designed for someone with poor credit, but traditional loans that require good credit may be more difficult to obtain.