In 2001 we have found that there is a new AC director who acknowledges that there is nothing in the code of ordinances prohibiting ferrets and therefore will tell folks they are legal. This is a city with code that could be potentially be taken as friendly or unfriendly depending upon who is enforcing it. If they mistakenly class a ferret as wild, it would be prohibited. The code makes no mention of ferrets. The definition of pet animal could be interpreted to include ferrets or the definition of domestic animal could be interpreted to exclude ferrets depending on the mindset of the authorities involved.
Nothing specifically indicates ferrets by common name or taxonomic classification.
Talk to animal control to find out their thinking so that you'll be informed. Code dated prior to 1994. Note that the city was reported by the local newspaper to be about to revise its animal codes in late 2000. The code makes no mention of ferrets. Animal control has been ferret friendly in the past, even holding a membership in the club at times.