These jokes are fun and clean and I found them at JokesByKids.com.  Feel free to share them with your kids, I think they'll giggle (and we all know there is nothing better than a child giggling.)

10) What’s red, white, blue, and green?
A patriotic turtle!
From Jessica, age 7, Abilene, TX

9) What did one flag say to the other flag?
Nothing. It just waved!
From Eloise, age 9, Charlottesville, VA

8) Why did Paul Revere ride his horse from Boston to Lexington?
Because the horse was too heavy to carry!
From Betty, age 9, CT

7) How is a healthy person like the United States?
They both have good constitutions!
From Tom P., age 8, KY

6) What dance was very popular in 1776?
Indepen-dance!
From Rachel, age 8, Long Beach, CA

5) What would you get if you crossed George Washington with cattle feed?
The Fodder of Our Country!
From Marie K., age 12, Dallas, TX

4) Teacher: “Where was the Declaration of Independence signed?”
Student: “On the bottom!”
From Christy, age 14, Denver, CO

3) Did you hear the one about the Liberty Bell?
Yeah, it cracked me up!
From Tom P., age 8, KY

2) What did King George think of the American colonists?
He thought they were revolting!
From Scott, age 11, Colorado

1) Do they have a 4th of July in England?
Yes. That’s how they get from the 3rd to the 5th.
From Big Al, a grownup, Frankfort, KY.