The population on Pubei's first line is estimated to be around 1.2 million people. This figure is based on the latest census data from the People's Republic of China, which indicates a significant concentration of residents in this area.

Pubei, a bustling city in the southeastern part of China, has experienced rapid urbanization and economic growth over the past few decades. This has led to a substantial increase in the number of people living in the city, particularly in the first line, which is the central business district and residential area. The population density in this region is higher compared to other parts of the city, reflecting the urbanization trends and the demand for housing and employment opportunities.

According to the National Bureau of Statistics of China, the total population of Pubei was approximately 3.5 million as of 2020. The first line, being the most developed and populated area, accounts for a significant portion of this total. The high population density in the first line is further supported by data from the Pubei Municipal Bureau of Statistics, which reveals that the area has seen a consistent increase in population over the years, driven by factors such as improved infrastructure, economic development, and migration from rural areas.

The population growth in Pubei's first line is also influenced by the city's strategic location and its role as a regional economic hub. The city is well-connected by road, rail, and air transportation, making it an attractive destination for businesses and individuals seeking employment and investment opportunities. This has led to a surge in real estate development, which in turn has increased the demand for housing and contributed to the population growth in the first line.

In conclusion, the population on Pubei's first line is estimated to be around 1.2 million people, reflecting the city's rapid urbanization and economic growth. This figure is based on official census data and reflects the significant concentration of residents in the central business district and residential area.