The question isn't entirely clear ... but here's my inferrence.

First, use "==" rather than "eq" when comparing numbers. Of course, you may actually be comparing strings - but then put the string in quotes. For example, if "26005.0000" is the same as "26005", then use ==. If they're different, use eq, but put "26005" in quotes (single or double, doesn't matter).

(also, please don't put all those spaces at the end of the lines .. they're just distracting ;->)

use strict;
use warnings;

my $file = 'scott.d3';
my $FhIn;

open $FhIn, '<', $file or die "Could not open $file: $!";

my $total;
while( my $line = <$FhIn> ) {
   my ($county, $year, $yr_tot) = split ' ', $line;
   if ( $county == 26005 )  {
#  - or -
#  if ( $county eq '26005' )  {
     print "$county  : $yr_tot\n";
     $total += $yr_tot;
   }                                                         
}
close $FhIn or die $!;
print "Total yr_tot's: $total\n";
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