Tables are 6' each with a height limit which I don't recall, mainly since it is rarely enforced. Traditionally it has been one table per member, which is why many sign up their wives, adult children (both actual and imaginary in some cases ), in-laws, and occasionally a pet or two as full members, just to get more table space.
Jim
Edit: I should have pointed out that the ED TCA doesn't take kindly to the imaginary children/pets technique to get an extra table or two. Some have been suspended from the organization for this in the past.