Geography - note:
world's third-largest country by size (after Russia and Canada) and by population (after China and India); Mt. McKinley is highest point in North America and Death Valley the lowest point on the continent
People
United States
Population:
303,824,640 (July 2008 est.)
Age structure:
0-14 years: 20.1% (male 31,257,108/female 29,889,645) 15-64 years: 67.1% (male 101,825,901/female 102,161,823) 65 years and over: 12.7% (male 16,263,255/female 22,426,914) (2008 est.)
Median age:
total: 36.7 years male: 35.4 years female: 38.1 years (2008 est.)
Population growth rate: