Just looked mine up, and guess what? I'm at my limit with 2! That's right, our city only allows 2 cats over the age of 6 months per household....same for dogs. The rest need to apply fpr a kennell liscense.
There is no limit in my city but in my household, I currently have 3 cats and right now that is my limit. At the very most I could take in one more desperate stray (like my Meezers) but I won't adopt another one for a little while. When I move out of my buddy's basement, I will definitely consider adopting another one since I will have more room.
There probably is one where I live (most of the suburbs have a limit here).
Do I know or pay attention? No... besides there are only 2 cats that actually climb in the windows...patches and Beauty's arthritis are getting to them so they're never in the window.