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List of Billboard Hot 100 number-one singles of 2019
From Wikipedia, the free encyclopedia

“Old Town Road” by Lil Nas X(pictured) featuring Billy Ray Cyrus spent nineteen consecutive weeks at number one on the Billboard Hot 100, breaking the record for the longest-running number-one song in the chart’s history. It later ranked as the best-performing single of the year.
The Billboard Hot 100 is a chart that ranks the best-performing songs in the United States. Its data, published by Billboard magazine and compiled by Nielsen SoundScan, is based collectively on each song’s weekly physical and digital sales, as well as the amount of airplay received on American radio stations and streaming on online digital music outlets.
During 2019, so far fourteen singles reached number one on the Hot 100; a fifteenth single, “Thank U, Next” by Ariana Grande, began its run at number one in November 2018. Of those fourteen number-one singles, four were collaborations. In total, seventeen acts topped the chart as either lead or featured artists, with ten—Swae Lee, Bradley Cooper, Jonas Brothers, Lil Nas X, Billy Ray Cyrus, Billie Eilish, Shawn Mendes, Lizzo, Lewis Capaldi, and Selena Gomez—achieving their first Hot 100 number-one single. Lil Nas X‘s “Old Town Road” featuring Billy Ray Cyrus was the longest-running number-one of the year, leading the chart for a record-breaking nineteen weeks, surpassing the previous record of sixteen weeks achieved by both “One Sweet Day“, by Mariah Carey and Boyz II Men (1995–96), and “Despacito“, by Luis Fonsi and Daddy Yankee featuring Justin Bieber; it subsequently topped the Billboard Year-End Hot 100.
Post Malone and Ariana Grande were the only acts to have multiple number one songs in 2019, with two.