Adventure Write Kids

 Age Groups: 
8 and under
9 – 10
11-12
13-15
16-18
   
Ayn Ryan Novel Contests

 For teens
   
Creative Kids Magazine

 Ages 8 – 16
   
Letters about Literature

 Grades 4 – 12
   
Optimist International Essay Contest

 Under 19
   
PBS KIDS GO! Writing Contest

 Grades K-3
   
Poetic Power Essay Contest

 Grades 4-6, 7-9, and 10-12
   
Poetic Power Poetry Contest

 Grades K-3, 4-6, 7-9, 10-12
   
Scholastic Book Fairs Kids Are Authors Contest

 For Grades K-8
   
Stone Soup Magazine 

 13 years old and younger
   
TIME for Kids Kid Reporter Contest

 13 years old and younger