The three major credit bureaus are important to contact if you are going to be repairing your credit score, but why? The major three credit agencies can help you by sending you your credit report.
If you catch an error on your credit report, these are also the companies you´d want to contact in order to correct the issue. You can easily contact these organizations by telephone, or through an email:
Equifax Credit Information Services, IncAddress: P.O. Box 740241
Atlanta, GA 30374
TransUnion LLC Consumer Disclosure Center
Address: P.O. Box 1000
Chester, PA 19022
Experian National Consumer Assistance Center
Address: PO Box 2002
One last tip:
You can note this information wherever most of your financial information is kept so that you can easily reach to the bureaus whenever you need to. Another great source are your local yellow pages, they should also have the contact information of these credit agencies!