InmateAidCensus counting of prisoners becomes partisan battleground. (Wisconsin State Journal, 11/18/2019)
Construction of the Redgranite Correctional Facility began in 1999, and it received its first inmates in early January 2001. Counting inmate population is why "the community" more than doubled in size during the next decade.
The Census Bureau’s policy pertaining to prisoners didn’t get much attention until recent decades because the population wasn’t large enough to alter representation, but now the U.S. imprisons more people than any other nation.
According to the linked report, Redgranite Correctional Institution houses 1,019 inmates, of which 346, 16.2% of the 2017 estimated population of Redgranite, are African-American.
Source: Wisconsin Department of Corrections (arrow added)
Waupun Correctional Institution. (11/19/2019)