What is the population of Antarctica?

There are no native peoples or permanent population on Antarctica, only scientists and people who work there temporarily in support of research about the health of planet earth. This does include some military members that support the research stations, especially in logistics. All temporary residents are employed by governments or international scientific agencies. All humans live on research stations.

The number during the isolated winter months may be as high as 1,000, and can increase during the active, accessible summer months to about 4,500. As many as 70,000 expedition tourists visited Antarctica in 2009, mostly by sea during the summer -- late November to mid-February.
Zero.

There is no permanent or native population on Antarctica. Everyone who is there temporarily works for a government answering questions about the scientific health of planet earth. The temporarily population varies between 1,000 and about 4,500 souls depending on the season.
The continent of Antarctica covers 5,400,000 square miles or 14,000,000 square kilometers. As of 2014, there are no permanent residents living in Antarctica. Approximately 98 percent of Antarctica is covered by ice.