The population set another all-time high record at the end of November 2014, as Qatar makes headway on key infrastructure projects like the Doha Metro and Lusail Expressway.
Year-on-year, there were nearly 200,000 more people in Qatar at the end of October, according to new government figures. The increase comes as several state projects, including the Doha Metro, get into full swing.
The slowdown comes amid predictions of a "new wave" of growth in the coming years, as Qatar continues to import more labor to finish key infrastructure projects before the 2022 World Cup.
Hundreds of thousands of people are expected to move to Qatar in the next two years as the country prepares for the 2022 World Cup. However, the challenges of accommodating the growing laborer population are likely to intensify.
Some 157,000 more people were in the country at the end of August than in July, signaling the return of many residents ahead of the start of the school year.
Some 230,000 people had exited the country in July, according to newly released government figures. That means the population is at its annual low - though will likely fall further by the end of August.
The population for June topped 2 million, with only 22,000 choosing to exit Qatar on holiday or for good last month, according to figures from the Ministry of Development, Planning and Statistics.
Growth is putting strain on Qatar's infrastructure, including its roads. In January, over 8,000 more vehicles hit the streets, the vast majority of them for private use.