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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 311,554 100.00% 445,342 100.00%
Total Native Population 288,694 92.66% 381,904 85.76%
Born in US 285,391 91.60% 377,392 84.74%
Born in Same State 138,904 44.58% 186,050 41.78%
Born in Different State 146,487 47.02% 191,342 42.97%
Born Outside US 3,303 1.06% 4,512 1.01%
Total Foreign Born Population 22,860 7.34% 63,438 14.24%
Naturalized 9,400 3.02% 20,343 4.57%
Non-Naturalized 13,460 4.32% 43,095 9.68%

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

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