Greetings Shirley:
Yes -- assuming of course a potential timber buyer has unimpeded physical access to the trees (no fences, structures, landscaping, etc.) and assuming the trees are large enough and of appropriate quality to spark a timber buyer's interest.
In order to assist you with the answers to the questions above, please contact a professional consulting forester using the U of I Extension Forestry link below:
http://web.extension.illinois.edu/forestry/pdf/tfb-nres-202.pdf
Best of Luck!