As a word of caution, the three major credit bureaus change their contact information frequently due to the number of consumer disputes they receive. 

Equifax Information Services LLC

PO Box 740256
Atlanta, GA 30374
http://www.equifax.com

Equifax Telephone Numbers:

• Main Number:  1 (888)425-7961
• Order Your Report: 1 (800)685-1111
• Fraud Dept:  1 (800)525-6285
• Opting Out:  1 (888)567-8688

Other Mailing Addresses for Equifax:

•  PO Box 740241
  Atlanta, GA 30374-0241
• PO Box 105873
  Atlanta, GA 30348
• PO Box 105788
  Atlanta, GA 30348
• PO Box 105518
  Atlanta, GA 30348

Experian

PO Box 4500
Allen, TX 75013
http://www.experian.com/

Experian Telephone Numbers:

• Main Number: 1 (800)493-1058
• Order Your Report: 1 (888)397-3742
• Fraud Dept:  1 (888)397-3742
• Opting Out:  1 (888)567 8688

Other Mailing Addresses for Experian:

• PO Box 9701
  Allen, TX 75013
• PO Box 9600
  Allen, TX 75013
• PO Box 2002
  Allen, TX 75002
• 475 Anton Blvd.
  Costa Mesa, CA 92626
• PO Box 9595
  Allen, TX 75013-9595
• PO Box 9556
  Allen, TX 75013

TransUnion

TransUnion LLC
Consumer Dispute Center
PO Box 2000
Chester, PA 19022
http://www.transunioncs.com

TransUnion Telephone Numbers:

• Main Number: 1 (800)888-4213
• Disputes: 1 (800)916-8800
  Order Your Report:  1 (800) 888-4213
• Fraud Dept: 1 (888) 909-8872
• Opting Out:  1(888) 567-8688

Other Mailing Addresses for TransUnion:

• PO Box 2000
  Chester, PA 19022
• PO Box 34012
  Fullerton, CA 92831
• PO Box 1000
  Chester, PA 19022