The planet Bespin was a gas giant that was about 118,000 kilometers in diameter.

Do people live on Bespin?

Attracting mining interests and remaining unaffiliated in galactic affairs, Ugnaughts were employed to extract tibanna from repulsorlifted facilities whilst Bespin's mostly human population resided in the open upper levels, exposed to a thin layer of breathable atmosphere in an area known as the "Life Zone."

How many people live on Bespin?

Population. The last official census placed Cloud City's population at 5,427,080. That figure did not count the droids. As Bespin's total population was estimated at 6 million, the city was by far the dominant settlement on Bespin.