The easiest approach is to traverse your list of locations and compute the distaance of each location from your designated position. To get locations of zip codes, try Geo::Coder::US: 
use Geo::Coder::US;
Geo::Coder::US->set_db( "geocoder.db" );
my ($ora) = Geo::Coder::US->geocode(
                    "1005 Gravenstein Hwy N, 95472" );
print "O'Reilly is located at $ora->{lat} degrees north, "
                             "$ora->{long} degrees east.\n";

[download]
To compute distances, use Geo::Ellipsoid: 
use Geo::Ellipsoid;
  $geo = Geo::Ellipsoid->new(ellipsoid=>'NAD27', units=>'degrees');
  @origin = ( 37.619002, -122.374843 );    # SFO
  @dest = ( 33.942536, -118.408074 );      # LAX
  ( $range, $bearing ) = $geo->to( @origin, @dest );
  ($lat,$lon) = $geo->at( @origin, 45.0, 2000 );
  ( $x, $y ) = $geo->displacement( @origin, $lat, $lon );
  @pos = $geo->location( $lat, $lon, $x, $y );

[download]

-Mark

In reply to Re: Getting Locations using Distance by kvale
in thread Getting Locations using Distance by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.