St. Ann, MO resident was cited for her hens (that she got just so she could take them to court and use the amendment). and lost in court, but is appealing.
A more detailed account of the ordinances for just St. Louis County municipalities, check here: http://www.urbanfarmliving.com/the-brief-on-chickens/st-louis-city-county-chicken-ordinances/
They also have a great detailed document to send to officials if you are trying to change ordinances...