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The Census includes all residents of the United States, regardless of their citizenship status. In some areas of the country, those without American citizenship account for a substantial proportion of the population, while in many areas, particularly in the Midwest, the make up only a small percentage of residents. Likewise, in some areas the majority of the population has come from other states within the U.S. while in others, particularly in the South, the population is more stable over time.

Nativity and Citizenship Status, 1990-2000
1990 2000
Number Percent Number Percent
Total Population 388,222 100.00% 458,614 100.00%
Total Native Population 352,802 90.88% 392,888 85.67%
Born in US 348,663 89.81% 388,670 84.75%
Born in Same State 231,560 59.65% 275,435 60.06%
Born in Different State 117,103 30.16% 113,235 24.69%
Born Outside US 4,139 1.07% 4,218 0.92%
Total Foreign Born Population 35,420 9.12% 65,726 14.33%
Naturalized 14,132 3.64% 22,335 4.87%
Non-Naturalized 21,288 5.48% 43,391 9.46%

Source: Census 2000 analyzed by the Social Science Data Analysis Network (SSDAN).

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