According to the study by World Data Stats, there are a total of 1.8 billion Internet users in the world.
Here is the list of the top 20 countries with the highest number of internet users.
China
Population: 1330.1 million ( 1.3 billion);
Internet users: 420 million
United States
Population: 307.2 million
Internet users: 234.4 million
Japan
Population: 126.8 million
Internet users: 99.1 million
India
Population: 1173.1 million (1.2 billion)
Internet users: 81 million
Brazil
Population: 198.7 million
Internet users: 72 million
Germany
Population: 82.3 million
Internet users: 65.1 million
Russia
Population: 139.4 million
Internet users: 59.7 million
United Kingdon
Population: 62.3 million
Internet users: 51,4 million
France
Population: 64.8 million
Internet users: 44.6 million
Nigeria
Population: 152.2 million
Internet users: 44 million
South Korea
Population: 48.6 million
Internet users: 39.4 million
Turkey
Population: 77.8 million
Internet users: 35.0 million
Iran
Population: 76.9 million
Internet users: 33.2 million
Italy
Population: 58.1 million
Internet users: 30.0 million
Indonesia
Population: 243 million
Internet users: 30 million
Phillippines
Population: 99.9 million
Internet users: 29.7 million
Spain
Population: 46.5 million
Internet users: 29.1 million
Mexico
Population: 111.2 million
Internet users: 27.6 million
Canada
Population: 33.5 million
Internet users: 25.1 million
Vietnam
Population: 89.6 million
Internet users: 24.3 million