OMG, I knew all of the words...  

Anything Dr. Seuss was probably first as my grandmothers bought them all for me when I was quite young.  But the first book that I remember finding sort of on my own and falling in love with was Watership Downs when I was about six or so.  It was magical.  

Vinyl all the way baby...

My mom was an avid reader and she took me with her to the library with her pretty much from infancy. You couldn't get a card of your own until you were five. Of course, I had to get mine as soon as my birthday rolled around that summer. They also limited the number of books you could get to five. We were at the library at least once, if not twice a week. 

I only remember one of the first five books I checked out all by myself using that brand-spanking new paper card with my name written on it in nice, neat cursive. It was The Five Chinese Brothers (there's a theme here I never realized until now 🤭)

It was based on a Chinese folk tale about identical brothers each having a special power. The first brother could hold the sea in his mouth and one time he did so to allow a little boy to gather fish. When he gestured for the boy to come back because he couldn't hold the sea much longer,  the boy ignored him and drowned when the man was forced to expel the sea. He was accused of murder. 

He was sentenced to be beheaded and convinced the judge to let him go home to say goodbye to his mother. His brother with an iron neck took his place and couldn't be beheaded. Each time the judge sentenced him he went home to "say goodbye to his mother" and the brothers swapped places. They couldn't drown the brother with the stretchy legs because he stretched them to the bottom of the sea. One was impervious to fire, and the other could hold his breath a long time.  

When nothing worked the judge said he must be innocent and let him go. 

No wonder I like reading weird books. 

The earliest book I remember reading is written by local children books author.

Instead of that I'll tell you what's the first book that has made a huge impact on me!

The Count of Monte Cristo by Alexandre Dumas! I've been so obsessed with this book that I couldn't let it out of my hands. I remember...I had to do some boring homework, my mother came in my room, took the book from me and has left it in living room. I've bribed my sister to take another book to the living room and bring me the Count. Till the afternoon, there were more than ten books on the table in living room, and I was still reading the Count. 

I remember Treasure Planet and The Hobbit, Frankenstein and Harry Potter.

Famous Five, Nancy Drew, Hardy Boys, The Hobbit and then in later life, Alex Rider, Harry Potter 

I went to a rural elementary school and a bookmobile came around and I discovered the science fiction of Robert Anson Heinlein, Andre Norton, and Alan E. Nourse (later I discovered Nourse was a medical doctor and surgeon, so any medical-related happenings in his books were extremely realistic).  My dad and I were avid readers; mom and older brother -- no.

Some really talented authors in the listings above in the Weekly Wrap Up, and I am sure more authors that I have not yet tried.  Thanks, @wildone.

I can't remember the first book I read, nor how old I was, but I used to check out as many books as the library would allow, take them home, and tie a rope around them and hoist them up to a platform I had built in a tree next to the house. My little "reading room" was a haven all summer long. I think what started me on binge-reading was The Wizard of Oz by L. Frank Baum. When I learned that there were more in the series (many by other authors who carried on the tradition after Baum's early death), I was hooked. The library had to send for some of the books from other sites in order to fulfill my endless requests!

I remember reading a lot of books of Tall Tales and biographies of Lincoln, George Washington Carver, Helen Keller, etc. (all written for younger readers), as well as other juvenile material, but the first books outside of that was "Treasure Island" and then "Kidnapped", both by Robert Louis Stevenson.  From then on I was hooked.  

8 hours ago, ReaderPaul said:

I went to a rural elementary school and a bookmobile came around and I discovered the science fiction of Robert Anson Heinlein, Andre Norton, and Alan E. Nourse (later I discovered Nourse was a medical doctor and surgeon, so any medical-related happenings in his books were extremely realistic).  My dad and I were avid readers; mom and older brother -- no.

Some really talented authors in the listings above in the Weekly Wrap Up, and I am sure more authors that I have not yet tried.  Thanks, @wildone.

We had bookmobiles here as well. They only came twice a school term when I was in Elementary school. I think they stopped after the fifth grade, or that's when we aged out of the program and were expected to use the school's limited Library.

I do not remember earlier books, I knew we were expected to read - the classes that read the most books and submitted the most book reports got parties at the end of the year. I was reading at five, mostly little picture books with two or three sentences per page. I honestly don't count those, but even at that age a kid could speed through them if they wanted to.

The first book I remember reading for fun on my own without any expectations or incentives was: My Side of the Mountain. I fell in love with it and read it twice. I was in the third grade. It didn't keep me interested in books though, I had started little league girls basketball, it was the first league for just girls that year. We had mixed teams until then, which I still played on, but the travel girls team took all of my free time.

I haven't read that book since pre-middle school. The other book series I read as a kid was the Narnia series, but to be honest the only one that held my interest was The Lion, the Witch, and the Wardrobe. The others I've only read one time and never revisited, but that book I have read multiple times.

Harry Potter and to be honest Nifty got me back into reading for fun. Then GA.  

There is a book I read every other year or so, and that's "Hunter's Horn," from Harriette Simpson Arnow, only because I was at a book store and they had a "Local Authors," section, and I took a chance and bought her book. It isn't an easy read for a lot of people, but I love it.