using one file to reference zip codes
Instead of Spreadsheet, INI file maybe a lite weight alternative. The content may be look like: 
code1 = state 1
code2 = state 2
...

[download]
Then your Perl script: 
use strict;
use Config::Tiny;

my $Config = Config::Tiny->read( 'ZipCodes.ini' );

sub check {
 my $code = shift;
 return $Config->{_}{$code} or die "No such code '$code' "; 
}

my $st_name = check ( $code ) ;

[download]
Code not tested, but the idea is like that. CPAN Config::Tiny

In reply to Re: Multiple file handles by exilepanda
in thread Multiple file handles by MoodyDreams999

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