If by "codes" you mean frequencies, your
local Radio Shack store sell scanner books based on geographical
location and used to (still might) on types of services you're
interested in monitoring. This was before the internet, so the demand
has dropped considerably as most folks can get what they're looking for
simply by googling a search term like "Boston scanner frequencies" or "Cook County IL Scanner Frequencies"
etc (drop the quotation marks and insert your town, city, county or
state. You may also find websites that are designed to host an online
community of local scanner enthusiasts - which trade frequencies, and
other info.
If "codes" means something else, please explain.
Good luck!
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