Many, many years ago I compiled a list of jokes from various sources. I have updated them only infrequently since then, but here they are for posterity's sake.
Animal Jokes
Blond Jokes
Christmas Jokes
College Jokes
"Dad Jokes"
Elephant Jokes
Engineer Jokes
English Jokes
Family Jokes
Knock-knock Jokes
Lawyer Jokes
Military Jokes
Miscellaneous Jokes
Pirate Jokes
Politician Jokes
Practical Jokes
Puns
Religious Jokes
Science and Technology Jokes
Sports Jokes
Work-related Jokes