| Urban | Suburban | Rural | ||||
| Year | population | population | population | |||
| millions | % | millions | % | millions | % | |
| 1950 | 49.412 | 32.8 | 35.087 | 23.3 | 66.197 | 43.9 |
| 1960 | 58.004 | 32.3 | 54.881 | 30.6 | 66.438 | 37.0 |
| 1970 | 63.797 | 31.4 | 75.622 | 37.2 | 63.793 | 31.4 |
| 1980 | 67.949 | 30.0 | 101.481 | 44.8 | 57.115 | 25.2 |
| 1990 | 78.472 | 31.6 | 119.978 | 48.2 | 50.316 | 20.2 |
| 1998 | 81.516 | 30.2 | 134.963 | 49.9 | 53.820 | 19.9 |
Sources: U.S. Department of Commerce, Bureau of the Census, Census of Population and Housing, 1950, 1960, 1970, 1980, and 1990, Number of Inhabitants, U.S. Summary (GPO, Washington, DC), Metropolitan Area Population Estimates for July 1, 1998 and Population Change for April 1, 1990 to July 1, 1998 (includes revised April 1, 1990 census population counts) (an Internet accessible data file, release date: December 17, 1999), Metropolitan Area and Central City Population Estimates for July 1, 1998 and Revised April 1, 1990 Census Population Counts (an Internet accessible data file, release date: December 17, 1999), and updates by agency.
Notes: Urban refers to population inside central cities of metropolitan areas (MAs). Suburban refers to MA population in suburbs outside central cities. Rural refers to nonmetropolitan population. MAs are defined for each population census. Data for 1990 are based on revised 1990 census population counts.
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