“There are three types of people in the world: Those who can count and those who can’t” is a joke that has been printed on many images.
   
“‘There are three kinds of people: Those who can count and those who can’t count,’ faxes Bob Bison of Arlington” was printed in the Fort Worth (TX) Star-Telegram on September 8, 1990. Authorship is uncertain.
         
“There are three kinds of mathematician, those who can count and those who can’t” was printed in the Gazette - Australian Mathematical Society (1991). “There are, it says, three kinds of mathematician. Those who can count. And those who can’t” was printed in The Guardian (London, UK) on December 30, 1994.
   
“There are three kinds of people: those who can count, and those who cannot. George Carlin” was posted on Twitter by @_cricket78 on April 10, 2014. American stand-up comedian George Carlin (1937-2008) if frequently credited, but there is no evidence that he ever said it.
 
 
Newspapers.com
9 September 1990, Fort Worth (TX) Star-Telegram, “Dave Bryant’s People ‘N Places,” sec. 1, pg. 3, col. 1:
“There are three kinds of people: Those who can count and those who can’t count,” faxes Bob Bison of Arlington, who adds, “P.S.: I hope I don’t have to explain this to you!”
   
Google Books
Gazette - Australian Mathematical Society
Volumes 18-19    
1991
Pg. 120:
‘There are three kinds of mathematician, those who can count and those who can’t.’
       
Newspapers.com
6 December 1992, St. Petersburg (FL) Times, “Feet Fleet meets U.S. enterprise” by Don Addis, pg. 6D, col. 3:
From Absolute Zero Gravity, a collection of scientific humor by Betsy Devine and Joel E. Cohen: “There are three kinds of people in this world - those who can count and those who can’t.”
 
Newspapers.com
30 December 1994, The Guardian (London, UK), “Diary” by David Newnham, pg. 20, col. 4:
There are, it says, three kinds of mathematician. Those who can count. And those who can’t.
 
Google Books
The Reader’s Digest
Volume 147, Issues 879-884
1995
Pg. 106:
There are three kinds of mathematicians — those who can count, and those who cannot.” -Contributed by John P. Jones.
 
Google Books
Murphy’s Law 2000:
What Else Can Go Wrong in the 21st Century!
By Arthur Bloch
New York, NY: Price Stern Sloan
1998
Pg. 62:
WINCORN’S LAW: There are three kinds of people : Those who can count and those who can’t.
     
Google Books
Measuring Computer Performance:
A Practitioner’s Guide
By David J. Lilja
New York, NY: Cambridge University Press
2000
Pg. 240:
There are three types of mathematicians. Those who can count, and those who cannot.’
Robert Arthur
 
Google Books
Mathematics & Common Sense:
A Case of Creative Tension
By Philip J. Davis
Natick, MA: A. K. Peters, Ltd.
2006
Pg. 51:
There are three types of mathematicians, those who can count and those who can’t. —Old Joke
 
Twitter
Qiqo Simbol
@qiqo
There are three kinds of people, those who can count & those who can’t.
4:39 AM · Apr 16, 2007·Twitter Web Client
   
Twitter
Rifat Nabi
@rifat
There are three kinds of people in the world: those who can count, and those who can’t.
9:58 AM · Oct 26, 2007·Twitter Web Client
   
Twitter
Twila Marie
@twila_zoned
There are three kinds of people: Those who can count and those who can’t.
3:57 AM · Apr 8, 2008·Twitter Web Client
 
Google Groups: ubuntu-users-archive
usb hardrive
Neil
Sep 9, 2008, 2:03:12 AM
(...)     
There are three kinds of people: Those who can count, and those who cannot count
 
Reddit—Jokes
Posted by u/bytie1 November 4, 2012
There are three types of people in the world…
those who can count, and those who can’t.
   
Reddit—Jokes     
Posted by u/bubblerboy18 March 19, 2013
There are three people in this world
The ones that can count, and the ones that cant.
   
Reddit—Jokes
Posted by u/shinynewbike April 10, 2013
There are three types of people…
Those who can count, and those who can’t.
 
Reddit—Jokes
Posted by u/theman3213 June 30, 2013
There are three types of people in this world
   
Twitter
@_cricket78
@_cricket781
There are three kinds of people: those who can count, and those who cannot. George Carlin.
3:58 AM · Apr 10, 2014·Twitter Web Client
   
Twitter
Robert Gilbert
@SuccessHotline
#1024.
“There are
three kinds
of people:
Those
who can count
and those
who cannot.”
  George Carlin (1937-2008)
  comedian
8:20 AM · May 26, 2014·Twitter for iPad
 
Reddit—Jokes 
Posted by u/mackmackenzie June 8, 2014
There are three kinds of people in this world…
Those who can count and those who cannot.
 
Reddit—Pharmacy
Posted by u/Megmca August 31, 2014
There are three types of people in the world. Those who can count and those who can’t.
         
Twitter
Dreamers Comedy
@DreamersComedy
There are three kinds of people. Those who can count, and those who cannot. - George Carlin
4:25 PM · Sep 15, 2014·Twuffer
 
Reddit—Cleanjokes
Posted by u/bilgewater44 November 27, 2014
I have found that there are three kinds of people;
Those who can count and those who can’t.
   
Google Books
I, Mathematician
By Randi D Ruden
Mathematical Association Of America
2015
Pg. 151:
There are three kinds of mathematician, those who can count and those who can’t
 
Reddit—Jokes
Posted by u/farman_786 October 12, 2015
There are three kinds of people: those who can count and those who can’t.
 
Reddit—Oneliners
Posted by u/gutfounderedgal November 17, 2018
There are three types of people in the world: those who can count, and those who can’t.
   
Google Books
Title There Are Three Types of People in This World_ Those Who Can Count, and Those Who Can’t: Motivational ,Inspirational Lined Notebook, Journal, Diary (110 Pages, Lined, 6 X 9)
Quote Series
Author Leya Margul
Publisher Independently Published, 2019
ISBN 1096330695, 9781096330691
Length 110 pages
 
Reddit—Oneliners
Posted by u/PelicanJesus July 10, 2019
There are three types of people in the world: those who can count and those who can’t.
 
Reddit—Oneliners
Posted by u/codylightful September 6, 2020
There are three kinds of people in this world: those who can count, and those who can’t.