Outside the oldest house in Miller Place sits the newest public library on the North Shore.

What might initially appear to be a newly installed, red-and-white mailbox in front of the William Miller House at 75 North Country Road is actually a Little Free Library, where residents of all ages are encouraged to pick up or drop off a book while on the go.

The mini library, which is shaped like a tiny schoolhouse and currently holds between 15 and 20 books ranging from “The Girl with the Dragon Tattoo” to “Goodnight Moon,” stands as the most recent free book exchange program to sprout up on Long Island, with others installed at West Meadow Beach and Heritage Park in Mount Sinai last year.

The idea for the book-sharing movement, which has spanned more than 70 countries around the world since the first little library was built by Todd Bol of Wisconsin in tribute to his mother in 2009, is that with a quick turn of a wooden latch, it can increase book access for readers of all ages and backgrounds and to inspire a love of reading and community connection.

Members of the Miller Place-Mount Sinai Historical Society unveiled their new addition Aug. 9 to a large crowd of smiling faces, which included residents, elected officials and representatives from Port Jefferson Free Library and Comsewogue Public Library. The two libraries partnered with the historical society to buy and sponsor it.

“I woke up this morning and I had the Mister Roger’s song in my head, ‘Oh what a beautiful day in the neighborhood,’” said Antoinette Donato, vice president of the historical society, during the ceremony. “This little library is symbolic of how our community comes together … and a community is strengthened when all the different organizations work well together. So when you reach into that box to put something in or take something out, please remember that you’re also reaching into your community. I hope it’s a very active library.”

Tom Donlon, director of Port Jefferson Free Library, said when he and Debbie Engelhardt, director of Comsewogue Public Library, decided to partner up to bring the program to the Miller Place community, they immediately knew the perfect place for it.

“Right away we thought of the historical society,” Donlon said. “The society really meshes with our libraries’ goals of education, entertainment, enlightenment and lifelong learning and investigation. We love that it’s here, it’s a great spot and I think it’s certainly going to serve the community very well.”

Engelhardt called little free libraries a beautiful concept.

“Anybody can use it as much as they want and it’s always a mystery when you open that box — you never know what you’ll find,” Engelhardt said. “There are no late fees, no guilt, no stress. If you want to keep a book, you can … we are pleased to partner with the historical society to bring this gem. The books inside will move you and teach you. We say that libraries change lives and, well, little free libraries can too.”

She added that these mini libraries have also proven to energize the spot they’re put in. For the historical society, whose William Miller House is nearly 300 years old and needs between $18,000 and $28,000 to renovate a collapsing roof and a total $100,000 for a full-house repair, any amount of attention to their cause is welcomed.

“What this does for us is it puts us in the limelight again, so that people are aware of us, they come and visit us and are sensitive to our needs,” Donato said.

Fittingly, although the box was stocked with books already donated by the libraries, the first batch of reading material from the public came from 12-year-old Jack Soldano, who spent the summer raising more than $1,000 for the historical society with his very own comic book stand.

Soldano contributed issues of Captain America, Star Wars and Power Rangers comics to join such titles as “Leaving Time” by Jodi Picoult, “Gone Girl” by Gillian Flynn, “The Stranger” by Harlan Coben and the Grimm fairy tale “Snow White and the Seven Dwarfs.”

Over at Heritage Park, next to the Shack concession stand by the playground, the red-painted little free library currently contains more youth-oriented reads. Several books within “The Babysitters Club” series and Walt Disney’s “Fun-To-Learn Library” collection, as well as “Sable” by Karen Hesse, are available for the taking.

Manorville resident Megan Murray, who was at the park with her young daughter, said she’s been a fan of the initiative since a few popped up in her area.

“The concept is great because it’s for everybody, rich or poor,” Murray said. “It’s really sad that so many kids don’t have access to books and I think it’s wonderful.”

Currently there are plans for a little free library to be installed at Rocketship Park in Port Jefferson next month.