| Total | Counties in coastal regions | Interior | ||||
| United | Gulf of | Great | of | |||
| Year | States | Pacific | Mexico | Atlantic | Lakes | U.S. |
| Land area, in thousands of square miles | ||||||
| 1994 | 3,536.3 | 509.9 | 114.5 | 147.8 | 115.4 | 2,648.7 |
| Population, in millions | ||||||
| 1960 | 179.3 | 17.9 | 8.4 | 44.5 | 23.7 | 84.8 |
| 1970 | 203.3 | 22.8 | 10.0 | 51.1 | 26.0 | 93.3 |
| 1980 | 226.5 | 27.0 | 13.1 | 53.7 | 26.0 | 106.7 |
| 1990 | 248.7 | 33.2 | 15.2 | 59.0 | 25.9 | 115.3 |
| 1995 | 262.8 | 35.2 | 16.5 | 61.0 | 26.5 | 123.5 |
| 1997 | 270.2 | 36.5 | 17.1 | 62.3 | 26.8 | 127.5 |
| Population per square mile | ||||||
| 1960 | 50.7 | 35.1 | 73.4 | 301.1 | 205.4 | 32.0 |
| 1970 | 57.5 | 44.7 | 87.3 | 345.7 | 225.3 | 35.2 |
| 1980 | 64.0 | 53.0 | 114.4 | 363.3 | 225.6 | 40.3 |
| 1990 | 70.3 | 65.1 | 136.2 | 399.2 | 224.8 | 43.5 |
| 1995 | 74.3 | 69.0 | 144.1 | 412.7 | 229.6 | 46.6 |
| 1997 | 76.4 | 71.6 | 149.3 | 421.5 | 232.2 | 48.1 |
Sources: U.S. Department of Commerce, Bureau of the Census, Statistical Abstract of the United States, 1996 (GPO, Washington, DC, 1996).
--. Statistical Abstract of the United States, 1999 (GPO, Washington, DC, 1999).
Notes: Coastal area includes 672 counties and independent cities with at least 15 percent of their land area either in a coastal watershed or in a coastal cataloging unit defined in 1992 by the National Oceanic and Atmospheric Administration.
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