Every number one of 2019

1. 1 Thank U, Next Ariana Grande Jan 5 · 1 week (4 in a row)
2. 2 Without Me Halsey Jan 12 · 1 week
3. 3 Search ↗ Sunflower Post Malone and Swae Lee Jan 19 · 1 week
4. 4 Without Me Halsey Jan 26 · 1 week
5. 5 7 Rings Ariana Grande Feb 2 to Mar 2 · 5 weeks
6. 6 Shallow Lady Gaga and Bradley Cooper Mar 9 · 1 week
7. 7 Sucker Jonas Brothers Mar 16 · 1 week
8. 8 7 Rings Ariana Grande Mar 23 to Apr 6 · 3 weeks
9. 9 Old Town Road Lil Nas X featuring Billy Ray Cyrus Apr 13 to Aug 17 · 19 weeks
10. 10 Bad Guy Billie Eilish Aug 24 · 1 week
11. 11 Search ↗ Señorita Shawn Mendes and Camila Cabello Aug 31 · 1 week
12. 12 Truth Hurts Lizzo Sep 7 to Oct 12 · 6 weeks
13. 13 Search ↗ Highest in the Room Travis Scott Oct 19 · 1 week
14. 14 Truth Hurts Lizzo Oct 26 · 1 week
15. 15 Someone You Loved Lewis Capaldi Nov 2 · 1 week
16. 16 Lose You to Love Me Selena Gomez Nov 9 · 1 week
17. 17 Someone You Loved Lewis Capaldi Nov 16 to Nov 23 · 2 weeks
18. 18 Circles Post Malone Nov 30 to Dec 7 · 2 weeks
19. 19 Heartless The Weeknd Dec 14 · 1 week
20. 20 All I Want for Christmas Is You Mariah Carey Dec 21 to Dec 28 · 2 weeks (3 in a row)

The numbers beside each song count the year's number ones in order. Weeks are counted from the Billboard Hot 100 charts dated in 2019.