I know we are outside the city limits but we live in a subdivision, where most people have under 1 acre.
I know there are some differences between chickens and roosters, when it comes to ordinances.
Does anyone know if this breaks some ordinance? Noise violation? something
The rules can change from one place to another, so I cannot tell what they are for your area. You would have to check for yourself, or else give more details of where you are located.
Some ideas for checking:
I would start by looking for an "animal control" section on your county website. That will often have a summary of what animals are allowed.
You can check your county zoning (most likely under animals, possibly under noise.)
Typically, lots in a subdivision will be zoned "Residential" or "R-2" or some such term, and the rules for what is allowed in that zoning will typically ban livestock. But sometimes they allow livestock on lots larger than a certain size, or you might live in a county with no zoning rules, or your subdivision might actually be zoned "Agricultural," so you will need to actually check to see what the rules are in your area.
If there is a Homeowner's Association, check that too. Most HOAs ban livestock, but a few permit them.
If "poultry" or "chickens" are allowed, then so is a rooster, unless the rules explicitly say "no roosters." But if the rules allow "hens," then that does not permit roosters. And noise ordinances may have one section for nose from animals, and another for noise from other things lawn mowers, so check the details.
You can also telephone the local Humane Society or Dog Pound and ask, because even if they do not know, they might be able to tell you where to find out.