According to the 2000 Census, Worcester County, Massachusetts has a population of 750,963 people. Of those, 672,915 (90%) are White, 20,498 (3%) are Black, and 50,864 (7%) are Latino. However, 4,118 (or 1% of the 750,963 people) are not residents by choice but are people in prison.
Even though prisoners cannot participate in the local community, the Census Bureau nevertheless counts them as residents of the county where they are incarcerated.
A more accurate description would not include the prisoners. This would give Worcester County a population of 746,845 with a demographic that is 90% White, 3% Black, and 7% Latino.
The numbers for Whites, Blacks and Latinos may not add up to the total number because we have not included racial groups other than Whites and Blacks and because the Census Bureau considers "Latino" to be an ethnicity, not a race. Most of the people reported as being Latino are also counted as being White or Black.