the following foreach block example extracts State value for a single ref :

my $ref = [
        {
                'State' => 'Maine',
                        'Town' => 'Portland'
        },
        {
                'State' => 'New Hampshire',
                'Town' => 'Concord'
        }
];

foreach ( @{$ref} )
{
        print $_->{State}."\n";
}
[download]

HTH.

Enjoy,
Mickey

Mickey, that did the trick...Thanks!

print(Dumper(@array));  -> print(Dumper(\@array));
print(Dumper(%hash));   -> print(Dumper(\%hash));
print(Dumper($a_ref));  -> ok
print(Dumper($h_ref));  -> ok
[download]

Now back to the question. You have an array which contains references to arrays (groups??) which contains references to hashes (cities), with key State (and key Town).

my @array = (
   [
      {
         'State' => 'Maine',
         'Town' => 'Portland'
      }, {
         'State' => 'New Hampshire',
         'Town' => 'Concord'
      }
   ], [
      {
         'State' => 'Florida',
         'Town' => 'Jacksonville'
      }, {
         'State' => 'North Carolina',
         'Town' => 'Waynesville'
      }
   ]
);

foreach my $group (@array) {        # which contains refs to arrays
   foreach my $city (@$group) {     # which contains refs to hashes
      print($city->{State}, "\n");  # with key State.
   }
}
[download]

You probably wanted an AoH instead of an AoAoH.

my @array = (
   {
      'State' => 'Maine',
      'Town' => 'Portland'
   }, {
      'State' => 'New Hampshire',
      'Town' => 'Concord'
   }, {
      'State' => 'Florida',
      'Town' => 'Jacksonville'
   }, {
      'State' => 'North Carolina',
      'Town' => 'Waynesville'
   }
);

foreach my $city (@array) {      # which contains refs to hashes
   print($city->{State}, "\n");  # with keys State.
}
[download]

IMHO, one of the best discussions of complex data structures, and how to access their innards , is to be found in Chapter 3. References and complex data structures of perlinter.pdf, available from Perl Training Australia. The OP would probably want the most current version of the course notes, though, which have been reworked into progperl.pdf, available from the same page noted above.

You might also wish to take a look at Re: How can I visualize my complex data structure?

HTH,

I'm loathe to just give you the answer without seeing any code that you've tried first. But you can probably get a lot of help from the Data Structures Cookbook.