Source:
https://www.kidsbookseries.com/search?age=6&rl=4Book series for 6-year-olds at reading level: 4th grade (list current as of Dec 15, 2025)
A to Z Mysteries by Ron Roy (Age 6 - 9)  Alec Flint Mysteries by Jill Santopolo (Age 6 - 11)  Amelia Bedelia (Young Amelia Chapter Books) by Herman Parish (Age 6 - 10)  Arthur Chapter Books by Marc Brown, Stephen Krensky, Sheilarae Carpentier Lau, et al. (Age 6 - 11)  Athlete Biographies by David A. Adler (Age 5 - 9)  Berenstain Bears (larger/lap-sized books) by Stan Berenstain, Jan Berenstain, Mike Berenstain (Age 4 - 8)  Berenstain Bears Big Chapter Books by Stan Berenstain, Jan Berenstain (Age 6 - 12)  Berenstain Bears First Time Books by Stan Berenstain, Jan Berenstain, Mike Berenstain (Age 3 - 8)  Berenstain Bears Happy House Books by Stan Berenstain, Jan Berenstain (Age 3 - 8)  Boxcar Children Mysteries by Gertrude Chandler Warner, Gertrude Chandler Warner, Patricia MacLachlan (Age 6 - 11)  Boxcar Children Specials by Gertrude Chandler Warner (Age 6 - 11)  Brian Floca's Picture Books of Vehicles by Brian Floca (Age 2 - 10)  Calendar Mysteries by Ron Roy (Age 6 - 9)  Capital Mysteries by Ron Roy (Age 6 - 10)  Chronicles of Narnia by C. S. Lewis (Age 6 - 12)  Curious George Discovers by H. A. Rey, Margret Rey (Age 4 - 8)  Curious George Original Adventures by H. A. Rey, Margret Rey (Age 3 - 8)  Dinosaur Cove by Rex Stone (Age 5 - 10)  Dinosaur Cove Cretaceous Adventures by Rex Stone (Age 5 - 10)  Disney Fairies Chapter Books by Kiki Thorpe, Laura Driscoll, Kirsten Larsen, et al. (Age 6 - 10)  Disney Fairies Fairy Dust Trilogy by Gail Carson Levine (Age 6 - 10)  Dora the Explorer by Sarah Willson, Leslie Valdes, Alison Inches, et al. (Age 3 - 6)  Dr. Seuss Beginner Books by Dr. Seuss (Age 3 - 8)  Dr. Seuss Classics and More by Dr. Seuss, Tish Rabe, Jack Prelutsky (Age 3 and up)  Eloise (Original Series) by Kay Thompson, Mart Crowley, Kate Telfeyan (Age 4 - 8)  Fancy Nancy Chapter Books by Jane O'Connor, Jane O'Connor (Age 6 - 10)  Fancy Nancy Guides by Jane O'Connor (Age 4 - 8)  Flat Stanley by Jeff Brown (Age 6 - 10)  Flat Stanley's Worldwide Adventures by Sara Pennypacker, Jeff Brown, Josh Greenhut, et al. (Age 6 - 10)  Frank and Joe Hardy: The Clues Brothers by Franklin W. Dixon (Age 6 - 10)  Goodnight, Goodnight Construction Site by Sherri Duskey Rinker (Age 2 - 6)  Hardy Boys are the Clues Brothers by Franklin W. Dixon (Age 6 - 10)  Here's Hank by Henry Winkler, Lin Oliver (Age 6 - 9)  Heroes in Training by Joan Holub, Suzanne Williams, Tracey West, et al. (Age 6 - 9)  Humphrey's Tiny Tales by Betty G. Birney (Age 5 - 9)  Just Grace by Charise Mericle Harper (Age 6 - 9)  Kickers by Rich Wallace (Age 6 - 9)  Knuffle Bunny by Mo Willems (Age 3 - 8)  Kylie Jean by Marci Peschke (Age 6 - 9)  LEGO Ninjago Graphic Novels by Greg Farshtey (Age 6 - 11)  Libby Mitchell Trilogy by Gloria Whelan (Age 6 - 10)  Little Whistle by Cynthia Rylant (Age 3 - 7)  Looniverse by David Lubar (Age 6 - 8)  Lotus Lane by Kyla May (Age 6 - 8)  Madeline by Ludwig Bemelmans, John Bemelmans Marciano (Age 3 - 8)  Magic Tree House Fact Trackers by Will Osborne, Mary Pope Osborne, Natalie Pope Boyce (Age 6 - 10)  Marty McGuire by Kate Messner (Age 6 - 9)  Maximum Boy by Dan Greenburg (Age 6 - 11)  Miss Malarkey by Judy Finchler, Kevin O'Malley (Age 5 - 9)  Moongobble and Me by Bruce Coville (Age 5 - 10)  Mrs. Hartwell's Class Adventures by Julie Danneberg (Age 5 - 9)  My First Little House Picture Books by Laura Ingalls Wilder (Age 3 - 8)  My Side of the Mountain by Jean Craighead George (Age 5 - 12)  My Weird School by Dan Gutman (Age 6 - 10)  My Weird School Daze by Dan Gutman (Age 6 - 10)  My Weirder School by Dan Gutman (Age 6 - 10)  Nancy Clancy Chapter Books by Jane O'Connor, Jane O'Connor (Age 6 - 10)  Nancy Drew and the Clue Crew by Carolyn Keene (Age 6 - 9)  Nancy Drew Notebooks by Carolyn Keene (Age 6 - 9)  Old Turtle by Douglas Wood, Joseph M. Martin, Douglas Wood (Age 5 and up)  Picture Book Biographies by David A. Adler, Michael S. Adler (Age 5 - 9)  Pinkalicious by Victoria Kann, Elizabeth Kann (Age 4 - 8)  Pinkalicious 8x8 Picture Books by Victoria Kann (Age 3 - 7)  Postcards from Buster Passport to Reading Level 1 by Marc Brown (Age 6 - 9)  Postcards from Buster Passport to Reading Level 3 by Marc Brown (Age 6 - 9)  Rainbow Magic Special Edition by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Baby Animal Rescue Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Dance Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Earth Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Fairy Tale Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Fashion Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Jewel Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Magical Animal Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Magical Crafts Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Ocean Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Pet Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Petal Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Princess Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Sugar & Spice Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Superstar Fairies by Daisy Meadows (Age 6 - 10)  Rainbow Magic: The Weather Fairies by Daisy Meadows (Age 6 - 10)  Redwall Illustrated Storybooks by Brian Jacques (Age 5 - 14)  Ricky Ricotta's Giant Robot by Dav Pilkey (Age 5 - 10)  Ricky Ricotta's Mighty Robot by Dav Pilkey (Age 5 - 10)  Roald Dahl Collections of Short Stories Told in Rhymes by Roald Dahl (Age 3 - 12)  Roald Dahl Short Stories by Roald Dahl (Age 5 - 17)  Salt in His Shoes by Deloris Jordan, Roslyn M. Jordan, Michael Jordan (Age 4 - 8)  Sophie by Dick King-Smith (Age 5 - 10)  Space Brat by Bruce Coville (Age 6 - 11)  Space Taxi by Wendy Mass, Michael Brawer (Age 6 - 10)  Sparkle Spa by Jill Santopolo (Age 6 - 11)  Star Wars: The Clone Wars DK Readers Level 2 by Simon Beecroft, Heather Scott, Clare Hibbert (Age 6 - 8)  Starvation Lake by Gloria Whelan (Age 6 - 10)  Stella Batts by Courtney Sheinmel (Age 6 - 9)  Stuart by Sara Pennypacker (Age 6 - 10)  Tales from the Back Pew by Mike Thaler (Age 6 - 9)  Young Amelia Bedelia Chapter Books by Herman Parish (Age 6 - 10)  Zack Files by Dan Greenburg (Age 6 - 11) 
Please note that reading level search results reflect our best estimate of the reading level range for each series based on the information we have available. To check or confirm the actual reading level for a specific book, specific book within a series as measured by one of the companies that perform these assessments, please go to the respective company's website as explained here: https://www.kidsbookseries.com/help/readinglevels.php.
We are in the process of adding more series to our database. Please check back again soon when we may have more series on this list for you.
Key for icons: = one or more books in the series has won an award = one or more books in the series has been on a best-seller list = one or more books in the series has been adapted into a film or musical = the series was adapted from a television series = the series has been adapted into a television series
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