“Where do cows go on vacation?”/“Moo York.”

A popular silly riddle is told about New York:
 
Q: Where do cows go on vacation?
A: Moo York.
 
The joke has been cited in print since at least 1978. “Where do eggs go on vacation?”/“New Yolk City!” is a similar joke.  “What newspaper do cows read?”/“The Moo York Times” is a similar “Moo York” cow joke.
 
“Where do cows go for entertainment?”/“To the moo-vies” is another cow joke.
 
 
Google Books
The Crack-a-Joke Book
Harmondsworth, England: Penguin Books
1978
Pg. 152:
Where do cows go on holiday?
Moo York.
 
Google Books
Big Book of Silly Riddles
By Brandreth Gyles.
New York, NY: Sterling Publishing Company, Inc.
1988
Pg. 38:
Where do cows go on vacation?
Moo York.
 
27 March 1994, Herald Bulletin (Anderson, IN), “A Little Bit of Humor,” pg. E10, col. 1:
Cathy: Where do cows go on vacation?
Karen: Moo York.
   
Google News Archive
10 July 1996, Wilmington (NC) Morning Star, Starwatch, pg. 4, col. 6:
A Little Bit of Humor
Courtney: Where do cows go on vacation?
Karen: I’m not sure - I think they go to Moo York!
 
Google Books
Super-Duper Good Clean Jokes for Kids
By Bob Phillips
Eugene, OR: Harvest House Publishers
2000
Pg. 62:
Where does an American cow come from?
Moo York.
 
Google Books
The Usborne Book of Silly Jokes
By Laura Howell
London: Usborne
2003
Pg. 8:
What American city do cows live in?
Moo York.
 
Google Books
Jokes for Kids:
Jokes, Riddles, & Tongue Twisters That Will Tickle Your Ribs & Make Your Funny Bone Laugh
By Nicole Townsend
Lulu Press, Inc. (Lulu.com)
2014
Pg. ?:
Q. Where do cows want to spend their holiday?
A. Moo York!
 
MyTownTutors
Summer Jokes: Top Summer Jokes
Posted on June 1, 2015 by mmolloy
(...)
60. Where do cows go on their summer vacation?… Moo York.