What's your limit in your town? How many eggs are you hoping to get per week? How big of an area do you have to keep them in? How much time do you have to clean up after them? SPACE is the biggest issue with an urban flock. Will you have room to allow them to run around and graze a little even if it just in a tractor? You really need at least two and probably three just in case you lose one, if you can get just a couple more and have the space and time to clean up after them you'll be even better off unless you just don't need that many eggs and have no neighbors who like eggs. LOL!