Comment Re:No? There are commercial applications... (Score 1) 327
Yes, TIGER data has zip codes and is free, but the problem is that there are numerous errors-- either just a mistake and there is no way to report it, or because the USPS changed zip codes, and does not make data public. The TIGER pages even say don't bother reporting errors in ZIP codes. I found a not too expensive database of corrected zip codes for TIGER lines, but don't know how accurate that is either.
