When Tom Dunn launched the Tilles Center’s summer jazz festival last year, he hoped to fill a void. With New York City’s jazz clubs a nearly two-hour drive west, and the Hamptons JazzFest even farther to the east, it seemed a good bet that a day’s worth of concerts at the Tilles Center — situated mid-Island at LIU Post in Brookville — would draw a sizable crowd. Sure enough, the Tilles Jazz Fest pulled in 1,500 attendees over the course of the day, according to Dunn, executive and artistic director at the Tilles Center for the Performing Arts.

“When you’re doing something for the first time, you never know how it’s going to go,” Dunn says. “We were absolutely delighted with the first iteration of the festival.”

The Tilles Jazz Fest returns for its second edition on July 19, headlined by Arturo Sandoval, the Cuban-born jazz trumpeter, and the John Pizzarelli Big Band, an ensemble known for carrying the jazz-standard torch. Concerts will take place at both outdoor and indoor stages; the festival also includes a Swingin’ Kidz Zone with face-painting, crafts and other activities.

Other acts on the bill include the Summer Camargo Quintet, whose trumpeter-leader also serves in NBC’s “Saturday Night Live” band; Cuban percussionist Pedrito Martínez and his Group; the brass band The Gotham Kings; and vocalist-composer Vanisha Gould. The festival just last week announced two new acts, the Brazilian vocalist Jamile and the hip-hop-influenced trio New Jazz Underground. LIU student musicians will also perform, and the LIU Marching Band will close the daytime festivities by joining The Gotham Kings in a New Orleans-style second line parade.

“The festival, in general, is a great way for people to hear a lot of different kinds of jazz in one place,” says Pizzarelli, who’ll be leading his 17-piece band through a tribute to Frank Sinatra. “You stay in one place and the musicians change.”

Jazz on Long Island dates to the earliest years of the region itself. As New Yorkers fled the city for the suburbs during the post-World War II years, jazz musicians joined them: Pianist Marian McPartland and her cornetist husband, Jimmy McPartland, moved to Merrick in the 1950s; Mississippi blues pianist Mose Allison moved to Smithtown in 1963; and saxophonist John Coltrane began working on his 1965 album “A Love Supreme” at the Dix Hills home he shared with his wife, Alice.

Jazz got pushed aside by rock in the late 1960s; today it’s consistently ranked as one of the least listened-to genres in music, according to Statista. Somehow, though, it endures, vocalist-guitarist Pizzarelli says. “I find it fascinating how many young people are out there playing and writing new things,” he notes. “It turns over every six, seven years, and I’m always amazed at what’s going on out there.”

These days, Long Island seems to be establishing a bona fide summer jazz season. One of its anchors is surely the Hamptons JazzFest, now in its fifth year, which will run through Sept. 6 at various East End venues. The Hamptons festival boasts more than 25 shows from such artists as Grammy-winning drummer Lenny White (whose credits include Chick Corea’s Return to Forever project), Latin jazz pianist Bill O’Connell and the Harlem Gospel Choir.

Given the uncertainty over funding of the arts and the economy in general, “we did not know what we would enter into this season,” says Claes Brondal, the festival’s executive director. Even wealthy Hamptonians, he feared, might be watching their wallets. Nevertheless, the festival’s kickoff party, originally budgeted for 150 guests at the Southampton Arts Center in late June, ended up drawing more than double that.

As of early July, “The Harlem Gospel Choir is at 80% capacity,” Brondal adds. “So the sustained interest has been very, very encouraging.”

In addition to the Hamptons and Tilles festivals, The Jazz Loft nightclub in Stony Brook will hold the 10th annual Harbor Jazz Festival from Sept. 17-20. Scheduled so far are shows from saxophonist Eric Alexander, vocalist Anaïs Reno and trumpeter-educator Terrell Stafford, who heads the Jazz Orchestra of Philadelphia.

Tom Manuel, president and founder of The Jazz Loft, has also launched another concert series, The Jazz Loft @ Southampton, running this summer at Stony Brook University’s Southampton campus. (Most of the performances are held indoors at The Avram, the campus’s auditorium and arts center.) Upcoming shows include “The Spirit & Soul of Latin Jazz,” from the Carlos Jimenez Mambo Dulcet, and “Abstract Angularity,” featuring the 17-piece Jazz Loft Orchestra.

“Ten years ago, if you had told me this would exist, I’d be like, ‘Yeah, yeah, yeah,’” Manuel says. Today, he adds, “there’s just so much popping and percolating out here.”