Chickens in the city ?

My town has an ordnance stating that chickens are not allowed to be raised / kept within city limits. Has anyone tried or succeeded in having a city ordnance amended or special exception given to allow chickens ? Would love to hear from anyone who has gone thru this. Good or bad.

I was not personally involved but a group got our ordinance changed a few years back.  It went from NONE to up to 6 hens may be kept in town no roosters allowed.  It also now outlines housing requirements, etc for the birds.  
This post may help you https://www.backyardchickens.com/articles/chicken-laws-and-ordinances-and-how-to-change-them.65675/