Postal And DMA Codes

JSON and CSV files (zipped) for US Postal and DMA codes. CSV postal code file contains Canadian postal codes as well. All formats include latitude and longitude for running Geospatial queries. I would have liked to include the Canadian postal codes, but it would made the JSON file almost 300 MB and exceeded GitHub's limits. I hope you find this useful, but 100% accuracy can't be promised. Feel free to distribute openly. Pull requests with updated lists are always welcome.