I believe that this is what you are trying to do. Note the square brackets (Making References)to create array references and the syntax @$tuple (Using References) to dereference them.

use strict;
use warnings;
my @sites=( ["50049", "city1", "url1"],
            ["52556", "city2", "url2"],
            ["50219", "city3", "url3"] );
foreach my $tuple (@sites) {
    my ( $zip, $name,  $url ) = @$tuple;
    ...;
}
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Update: Added Links, corrected typo