Google offers free phone number information for businesses at 1-800-GOOG-411 (1-800-466-4411). When you call this number, it will ask you to speak the city and state of the number you are seeking. Then, you speak the name of the business. It will give you it's top result and, if it is correct, it will connect you directly, for free.
I have this number listed under "Information" in my contacts and can't tell you how many times it has come in handy (especially since it, now, costs $1.75 for each 411 call with my cell phone service).
Another contact that is a good idea to add to your cell phone is a number listed as ICE. This number is what emergency personnel look for In Case of Emergency. Along with listing it as ICE, you can explain who the contact is in parentheses. ex. ICE (husband-Mark)