Postal codes made easy

Add this line to your application’s Gemfile:

gem 'postjoy'

Lookup postal code

Postjoy.find(94109)
# =>
{
  city: "San Francisco",
  state: "California",
  state_code: "CA",
  latitude: 37.7917,
  longitude: -122.4186
}

Returns nil if the postal code does not exist

Also adds validations for Rails

class Address < ActiveRecord::Base
  validates :postal_code, postal_code: true
end

Data from GeoNames

• international postal codes

Everyone is encouraged to help improve this project. Here are a few ways you can help:

• Report bugs
• Fix bugs and submit pull requests
• Write, clarify, or fix documentation
• Suggest or add new features

To update postal codes, download the updated list from GeoNames to US.txt and run:

rake create