First, if you did put money into a 401k, your money is protected by federal laws. To find it, you're going to have to do some detective work. Here are five ways to locate information about an old 401k plan:
1.The first and best method of locating an old 401k is to contact your old employers. Ask them to check their plan records to see if you ever participated in their 401k plan. Be sure to have ready your full name, social security number and the dates you worked for them. 2.Most plans are required to file an annual "Form 5500" with the U.S. Government. You can search these 5500's for the name of your former employer at free websites like www.freeERISA.com. If you can find a Form 5500 on an old plan, it will have contact information. 3.Check with The National Registry to see if your former employer has listed you as a missing participant. The registry is a nationwide, secure database listing of retirement plan account balances that have been left unclaimed. This website is designed to help match employers with abandoned or forgotten employee retirement account balances with the former employees.
Used2 Bee is correct: if you had a 401(k) you will get quarterly statements even after you were let go. Use one of these statements for information on where the account is kept. IF you didn't get any statements maybe you were not in the plan, or you moved without a forwarding address. If you have no old statements, follow alwaysdaddysgir's advice.