Here is a book list and some websites with many more books for first through third grade students. No list is comprehensive, so please add to this by commenting if you have a book or series that has worked for you. Also, if you have used one of these books or series, please give some feedback for our other members.
Books and Book Series for Grades 1-3
Links to lists:
It is harder to find chapter books for first graders, but some of the books on these lists may work.
My personal book series recommendations:
Junie B Jones by Barbara Park
Cam Jansen by David Adler
A to Z Mysteries by Ron Roy
Magic Tree House by Mary Pope Osborne
Judy Moody by Megan McDonald
Frog and Toad byArnold Lobel
Amber Brown by Paula Danziger
The Wayside School series by Louis Sachar
The Black Lagoon chapter book series by Mike Thaler (beware there is also a picture book series)