Simple gem to get city, state, and time zone for a given zip code. It has a yaml database bundled with it, so you need several mb of memory for the whole hash.

Add this line to your application's Gemfile:

gem 'zip-codes'

And then execute:

$ bundle

Or install it yourself as:

$ gem install zip-codes

ZipCodes.identify(ZIP_CODE, optional: array_of_countries(default => ["US"]))

ZipCodes.identify('30301')
# => {:state_code=>"GA", :state_name=>"Georgia", :city=>"Atlanta", :time_zone=>"America/New_York"}

ZipCodes.identify('06601', ["CZ", "SK"])
# => {:state_code=>"SK", :state_name=>"Slovenská republika", :city=>"Humenné 1"}

ZipCodes.identify('16000', ["CZ", "SK"])
# => {:state_code=>"CZ", :state_name=>"Česká republika", :city=>"Praha 6"}

First run or run after change countries will take a while, as the yaml has to be loaded

Available countries:

US, SK, CZ

If you are using Rails, you can load the hash on app startup for production and staging.

# config/initializers/load_zip_codes.rb
ZipCodes.load unless Rails.env.development?

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request