For OP: here's a commercial source, but read the disclaimers and ToS: http://www.unitedstateszipcodes.org/ http://www.unitedstateszipcodes.org/ For all, backg

For OP: here's a commercial source, but read the disclaimers and ToS: http://www.unitedstateszipcodes.org/ http://www.unitedstateszipcodes.org/ For all, background info on the USPS budget/deficit: http://www.nytimes.com/2012/07/31/opinion/nocera-its-d-day-for-the-post-office.html http://www.nytimes.com/2012/07/31/opinion/nocera-its-d-day-f... http://www.gao.gov/products/GAO-13-872T http://www.gao.gov/products/GAO-13-872T Imagine for a moment working for a company that had had been in business for 220+ years, had policy and procedure manuals that reflected every year of the history, had thousands of physical locations, delivered to millions of locations many times per week, and had 535 people on the board of directors (in the sense of trying to micro-manage whatever they felt like sticking their oar into.) I find it somewhat amazing that the USPS can still deliver mail across the country for less than 50 cents, let alone all the other stuff they can handle - ever been shipped a hive of bees by mail? It's in the Domestic Mail Manual, under Bees http://pe.usps.com/text/dmm300/601.htm http://pe.usps.com/text/dmm300/601.htm