Thanks for the tips all.  I went ahead and just created one myself and
will make it available on my personal domain to be used as a web
service on any other project.  Bare bones (unsorted) example here.

http://www.worldwildweb.biz/development/zipCodesWithin.cfm

~Dave

On 7/7/05, Joe Kelly <[EMAIL PROTECTED]> wrote:
> Robert is correct, it just takes a little math.
> One thing to remember is that these databases usually measure from the
> center of the zip code to the center of the zip code as opposed to
> "perimeter to perimeter".  So it is possible to actually have a
> portion of a zip code area within your radius, but because the center
> is outside the radius, it will not show in your results.
> 
> Thanks,
> Joe Kelly
> 
> 
> On 7/7/05, Robert Shaw <[EMAIL PROTECTED]> wrote:
> > For the future, this is pretty simple code to write. All you need is the
> > longitude and latitude of each zip and there are several databases with this
> > info on the web. After you have that, the formula for calculating the
> > distance is pretty straight forward, especially if the database is in a SQL
> > server. The formula we use is accurate for zip within 1500 miles since we
> > did not add the cosign for the curvature of the earth.
> >
> > Robert.
> >
> > ----- Original Message -----
> > From: "Dave Shuck" <[EMAIL PROTECTED]>
> > To: <[email protected]>
> > Sent: Thursday, July 07, 2005 10:58 AM
> > Subject: Re: Looking for a zipcode web service
> >
> >
> > I may have found one that will work.  If anyone is intersted, this one
> > seems like a decent solution:
> >
> > http://www.bindingpoint.com/service.aspx?skey=bf43fb5e-7048-4c5d-8687-89959970f3fd
> >
> > Example and returned XML here:
> > http://tinyurl.com/b8zx7
> >
> > Thanks for the suggestions.
> >
> > ~Dave
> >
> >
> > On 7/7/05, Daniel Elmore <[EMAIL PROTECTED]> wrote:
> > > I've used MelissaData for things like this.
> > >
> > > http://www.melissadata.com/lookups/zipradius.asp
> > >
> > > I don't know if this feature is supported in their web services, you'll
> > > have
> > > to click around.
> > >
> > > - Daniel
> > >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> > > Behalf Of Dave Shuck
> > > Sent: Thursday, July 07, 2005 10:16 AM
> > > To: [email protected]
> > > Subject: Looking for a zipcode web service
> > >
> > >
> > > I am looking for a web service in which I can pass a zipcode and a
> > > radius distance in miles and return all zipcodes within that radius.
> > > I have searched on www.xmethods.com and found some that will return
> > > distances between zips, but will not do exactly what I am looking for.
> > >  Is anyone aware if one exists?
> > >
> > > Thanks,
> > >
> > > ~Dave
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