Trade in: $235
Private Party: $314
Dealer Retail: $448
These quotes are from Edmunds, True Market Value.
See http://www.edmunds.com/tmv/used/ford/index.html#
I had to substitute specific information such as vehicle options, location, and condition. If you visit the site, you can obtain more specific values.
However, the value of a car is really what the market available to you decides. For example, if someone in your area happens to want an older rear wheel drive station wagon in good condition, doesn't want to travel far, and has a preference for Ford, the car is worth much more.
Information is also available from Kellys blue book and other sources. Be aware however these sources usually can not account for real world market value.
Please let me know if you have any other questions!