According to a recent report by Global Knowledge, one of the largest IT training providers world-wide, ITIL Foundation Certification training took 1st place as the most popular IT certification in North America.
According to the article:

“Over 12% of IT professionals have earned their ITIL Foundation certificate, making it the most popular certification in North America. For those planning to pursue certification this year, 7.2% have ITIL Foundation in their sights.
ITIL Foundation has been an industry staple for years, but the upgrade to ITIL 4 in early 2019 only added to this certification’s popularity amongst those who manage IT best practices. Its first update since 2011, ITIL 4 covers the latest best practices in IT service management (ITSM), the new terminology that organizations are using within ITSM, and how DevOps, Agile, and Lean IT are affecting the ITSM domain.
ITIL Foundation is also associated with higher-than-average salaries. This is because IT professionals who earn their ITIL certificate often go on to earn more advanced certifications. In fact, ITIL-certified professionals in the United States hold an average of 5.1 career certifications and earn $129,402 a year.