How many countries are first world?

Countries with an HDI score of 0.800 or higher are considered to have “very high human development”, which would roughly equate to a First World country. The most recent HDI rankings will appear in the table lower down on this page, including the 66 countries that qualified for the distinction in the 2020 report.

https://worldpopulationreview.com/country-rankings/first-world-countries#:~:text=Countries%20with%20an%20HDI%20score,distinction%20in%20the%202020%20report.