Population size - Country rankings:
The average for 2017 was 38.19 million.The highest value was in China: 1386.4 million and the lowest value was in Tuvalu: 0.01 million. Below is a chart for all countries where data are available for: Population size.
Definition: Total population is based on the de facto definition of population, which counts all residents regardless of legal status or citizenship. The values shown are midyear estimates.