I'm looking for a (free) list of all valid five-digit US zipcodes that
I can access in electronic form over the web.  Just the zipcodes - I
don't care what city/state they refer to (but I wouldn't object to
having that also - I could easily filter out just the zipcodes). My
goal is to have a plain ASCII textfile, but I could convert HTML, PDF,
or just about any other source format.

Hello David,

I'm glad I was able to assist you. As noted in the comments, you can
download the information here :

MYSQL Zip Code Database 
http://www.darkshire.org/~jhkim/programming/zipcodes/

To find this answer, I simply pointed you to the same files I have
used in the past. If you would like to find similar sites/projects
like this, you can search Google for :


Mysql zip code database
://www.google.com/search?q=mysql+zip+code+database


Thanks for the great question! Should you have any further questions,
do no hesitate to ask. I will do all I can to help.

SgtCory

Hello davidfilmer,

I think finding a free database is going to prove be to be the
toughest challenge. This may suit your needs: (it is stored in MYSQL
dump format)

MYSQL Zip Code Database
http://www.darkshire.org/~jhkim/programming/zipcodes/

All you would need to do is 'strip' out the extras you don't need, and
you will have a near complete list. Let me know if this meets your
needs, as I was unable to locate a complete 'free' resource.

Thanks and good luck!
SgtCory

davidfilmer-ga...

You might be able to extract the data you need from the state
listings here:
http://www.ip2location.com/zipcodes/

Greetings. Sublime1's comment was of interest, but the information
presented on that website was only a small sample of a commercial
product.

SgtCory's link gave more complete information, and reading a little on
that website led me to the author's sorce data at the Census Bureau,
   http://www.census.gov/geo/www/tiger/zip1999.html
I was easily able to extract the 42,000+ zipcodes from this database
dump.

SgtCory, your information proved most useful.  Would you please mark
this question as closed? Thanks!

(It seems odd to me that USPS doesn't just publish this data. But, no,
you gotta go to Census Bureau of all places! go figure)