Blank U.S. map with counties labeled by FIPS code.  These can be colored by editing the document as text and adding FIPS codes, followed by a fill color for each group.  This file is based on the public domain tagged file:USA Counties with FIPS and names.svg, which I processed by a simple Perl script to add class tags and from which I also removed a few small errors and inconsistent formatting.
Although I don't foresee any further need for processing, I should point out that the size of the file is such that even simple changes require a program to be run.  Perl is freely downloaded and can run as a standalone (ActivePerl) or under Cygwin.  The script I ran was not exactly rocket science, but I'll post it hopefully to embolden anyone who sees a need for further modification of the file.  The following is the entire program, which processed the file in about two seconds:

use integer;
use strict;
use warnings;

# Open files

open (OLD, "&lt; input.txt" ) || die ("no input?");
open (NEW, "&gt; output.txt" ) || die ("Couldn't open output file: $!");
my (@a, $code, $class, $tmp);

while (&lt;OLD&gt;)
{
push @a,$_;
if (/(\d\d\d\d\d)/) {$code=$1};
if (/class/) {$class=@a};
if (/path/)
   {
   if ($class) {$a[$class-1]=('     class="land s' . $code . '"'."\n")} else {print "no class: $code"};
   while ($tmp=shift(@a)) {print NEW $tmp};
   }
};
Own work
Mike Serfas