The most checked-out library book of 2016 in both Nassau and Suffolk counties was the psychological thriller “The Girl on the Train” by Paula Hawkins. The book was adapted into a film, which starred Emily Blunt and premiered last October.

Jennifer Bollerman -- head of Central Reference and Adult Services at Patchogue-Medford Library -- isn’t surprised.

Crime and mystery stories dominated the top 10 in both counties’ lists of top 100 books checked out (the list includes only actual bound books, not audiobooks). Non-fiction books failed to break the top 10 in either category.

In addition to “The Girl on the Train,” David Baldacci’s novel “The Last Mile” ranked No. 2 in Suffolk and No. 4 in Nassau. The novel follows an American football star who is convicted of murder. The book was released two weeks after the finale of the FX miniseries “The People vs. O.J. Simpson: American Crime Story.”

Author James Patterson appeared most often in the respective counties’ top 10s, with his three novels “Private Paris,” “NYPD Red 4,” and “15th Affair.”

“A lot of libraries will try to stay in front of what books are going to get media play, [and] with what movies are going to come out,” Bollerman said.

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Rhonda Todtman, assistant director of Peninsula Public Library in Lawrence, said it’s rare for a nonfiction book to gain traction in libraries.

“In my library, the nonfiction collection circulates, but it isn’t our most popular by any stretch unless it’s one of those big books,” she said. “Every so often you’ll get a memoir that hits everybody. The Bruce Springsteen one was particularly popular in the last couple months.”

Todtman and Bollerman said that when high demand is anticipated for a new release, libraries will order additional copies since they know circulation will be brisk.

“Libraries have a formula they work with, how long is it reasonable for someone to wait [for a book], while keeping in mind their budget, or you could try to estimate based on previous history,” Bollerman said. “Most libraries, at this point, we get an extra copy or two if you see it’s going to get media play.”

For Peninsula, this process is similar even though the library serves a smaller population.

Both Todtman and Bollerman have noticed that the most circulated books tend to reflect the New York Times Best Sellers List.

“I think people like a quick read,” Todtman said. “People on Long Island are really busy; they’re commuting. In my community we have a lot of larger families, [and] the moms don’t always have as much time to read as they’d like and they like those quick books with quick chapters they can pick up, put down, not lose a thread of a long, complicated, dramatic story, also one that will keep their interest.”