The audiobook versions are a whole different way to experience them. Michael Beck and Dennis Boutsikaris have narrated so many, and their performances add another layer. Listening to 'The Racketeer' on a long drive is a fantastic experience. So maybe the count should be 'how many are available as gripping audiobooks?'
Practically all of them, I'd wager. So if you're an audiobook person, the number is functionally the same as the total number of his novels minus the few clear outliers.
I have a spreadsheet. It's color-coded. Green for the ones I've read, yellow for the ones I own but haven't read, red for the ones I didn't enjoy (a very short column). Seeing the list in Excel, sorted by year, is deeply satisfying. It turns a casual reading habit into a manageable project. I highly recommend it.
Don't sleep on his later work when you look at the list. 'Camino Island' and 'Camino Winds' are fun departures into the book world and light crime. Seeing them on the timeline shows he's not just repeating himself. The order reveals his attempts to stretch the genre, even if not every experiment is a home run.
I'd be curious to see the list annotated with which ones were adapted into movies. That's a fun layer on top of the release years. 'The Firm' (91) -> movie in '93. 'The Pelican Brief' (92) -> movie in '93. That was a crazy two years. The timeline of book-to-screen says a lot about his cultural impact at the time.
The most efficient way to get the list is to go to a library catalog website, search Grisham, and sort by publication date. It'll show everything, including re-issues and different editions. What's fun is seeing the original cover art for the early books—very 90s. The list isn't just titles and years; it's a visual history of book design. The bold, simple fonts of today replaced the detailed, illustrative covers of the early paperbacks. Browsing the list this way adds a layer of nostalgia for how books used to look.
For a new reader, I'd say look at the list and pick the five most famous titles from the 90s. Read those. If you're still hungry for more, then look at the full chronology. Starting at the beginning with 'A Time to Kill' is rewarding, but it's a much grittier, less polished book than what came after.