What is the population of Osaka?

The metro area population of Osaka in 2020 was 19,165,000, a 0.3% decline from 2019. [The metro area population of Osaka in 2019 was 19,223,000, a 0.3% decline from 2018. The metro area population of Osaka in 2018 was 19,281,000, a 0.04% decline from 2017.]