Between 1870 and 1920 the urban population of the United States ballooned from fewer than 10 million people to more than 54 million.

Over the last decade, the population of greater Denver has ballooned by almost one-quarter, hitting 2.3 million people today.

The school's population has ballooned to 3,200 students from 1,500 in 1993, and it is projected to reach 6,000 by 2008.

The illegal immigrant population in Arizona has ballooned to an estimated 350,000, a four-fold increase over the past 15 years.

Our population has since ballooned to 249 million people (1990 census), and men of all colors and nations are welcome.

The city's population ballooned to 19,922 in 1890, and 36,848 in 1900 with the arrival of the railroads.

Its population has ballooned from about 7,000 to 30,000.

In those intervening years, the population of the city's shelter system has ballooned.

The population had ballooned by approximately 130 million within the space of forty-odd years.

Since 1960, Suffolk's population has ballooned by more than a million, to 1.33 million people.