Oklahoma ranked 28th in population in the US with an estimated total of 3,493,714 in 2002, an increase of 1.2% since 2000. Between 1990 and 2000, Oklahoma's population grew from 3,145,585 to 3,450,654, an increase of 9.7%. The population is projected to reach 4.1 million by 2025. The population density in 2000 was 50.3 persons per sq mi.
In 2000 the median age in Oklahoma was 35.5; 25.9% of the population were under age 18 while 13.2% were age 65 or older.
The largest city is Oklahoma City, which in 2002 had an estimated 519,034 inhabitants in the inner city (up from 463,201 in 1994) and a 1999 estimated population of 1,046,283 in the metropolitan statistical area. Tulsa, the 2nd-largest city, had a 2002 estimated population of 391,908 in the inner city and a 1999 estimated population of 786,117 in the metropolitan area. Lawton ranked 3rd with a population of 92,757 in 2000.