City-Data.com has put together a list of the Top 10 Least Racially Diverse American Cities. Check out the list below.
1

Texas (99.3%pop. 5,961)
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2

Pennsylvania (99.2%pop. 5,072)
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3

Pennsylvania (99.1%pop. 5,157)
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4

Ohio (98.8%pop. 5,837)
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5

Pennsylvania (98.8%pop. 8,798)
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6

New York (98.7%pop. 5,709)
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7

Illinois (98.7%pop. 5,614)
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8

New York (98.6%pop. 7,323)
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9

New Hampshire (98.6%pop. 6,083)
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10