Web dev people: Looking for a software package that lets me calculate the distance between two given zipcodes.

[yllus]

Has anyone bought/used a database package that includes zipcodes, plus the corresponding longitude/latitude values, that enable you to calculate the distance between people?

So far I'm looking at:

ZIPCodeWorld - Premium Edition
Zipwise Developer - Distribution License
Zip Code Database

Any free alternatives at all out there? I figured the USPS may have something, but they don't do bulk long/lat checks as far as I can tell. Thanks in advance.

 

[Sphexi]

I think most online map generators have the ability to do this, unless you're not looking for driving distance, rather looking for straight line distance.

 

[TitanDiddly]

Talk to this guy:

http://acg.media.mit.edu/people/fry/zipdecode/

 

[yllus]

Whoops, I left out the situation context. This is for a client's e-commerce website - I can't legitimately use those free tools to do the calculations needed.

 

[777php]

Originally posted by: PhasmatisNox
Talk to this guy:

http://acg.media.mit.edu/people/fry/zipdecode/

hey, thats kinda cool

 

[fs5]

screen scrap maps.google.com.

 

[hellman69]

distance = Sqr((69.1 * (from_long - to_long) * cos(to_lat/57.3) ^ 2 + (69.1 * (from_lat - to_lat)) ^ 2)

You can get most of the lat and long info from the census bureau website. You'll have to dig around for it, but it is there.

Trevor