How can I figure out what kind of bike I have?

Does it have an identification number, like a vin number on a car, anywhere on the frame?

No numbers or other markings :(

Posting pictures would help a lot. If it happens to be a Schwinn, you might be able to match the serial to a year (but not a particular model).

Old Schwinns sometimes have serial numbers stamped on the dropouts, where the rack, chain guard and wheel are attached in this picture:
http://www.mandarax.net/bikes/cruiser3_M.jpg

Sometimes serial numbers are under the bottom bracket, where the pedal cranks are attached
http://capsnet.usc.edu/dps/images/SerialNumber4.jpg

And sometimes on the head tube
http://re-cycle.com/ImageFetch.ashx?picNum=3&Size=0&ImageID=663

Schwinn serial number info can be found here.
http://www.angelfire.com/rant/allday101/SchwinnCodes1.html

Thanks for the good info @jaytkay I don’t see a # though in any of those places, or any where else. I’m thinking maybe someone painted over it and covered up the number…

It’s a cheap (machine made in probably Taiwan or China) model made to resemble a classic cruiser. It was likely originally sold at a department store.

compare it to other similar models.