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entities. <br />Estimates of urban and rural population, housing units, and characteristics reflect boundaries of urban areas defined based on Census 2000 data. <br />Boundaries for urban areas have not been updated since Census 2000. As a result, data for urban and rural areas from the ACS do not necessarily <br />reflect the results of ongoing urbanization. <br />Source: U.S. Census Bureau, 2007-2011 American Community Survey <br />Explanation of Symbols: <br />1. An "" entry in the margin of error column indicates that either no sample observations or too few sample observations were available to <br />compute a standard error and thus the margin of error. A statistical test is not appropriate. <br />2. An '-' entry in the estimate column indicates that either no sample observations or too few sample observations were available to compute an <br />estimate, or a ratio of medians cannot be calculated because one or both of the median estimates falls in the lowest interval or upper interval of an <br />open-ended distribution. <br />3. An '-' following a median estimate means the median falls in the lowest interval of an open-ended distribution. <br />4. An '+' following a median estimate means the median falls in the upper interval of an open-ended distribution. <br />5. An '"""' entry in the margin of error column indicates that the median falls in the lowest interval or upper interval of an open-ended distribution. A <br />statistical test is not appropriate. <br />6. An """' entry in the margin of error column indicates that the estimate is controlled. A statistical test for sampling variability is not appropriate. <br />7. An 'N' entry in the estimate and margin of error columns indicates that data for this geographic area cannot be displayed because the number of <br />sample cases is too small. <br />8. An '(X)' means that the estimate is not applicable or not available. <br />