Census Bureau's Privacy Method Skews Data for Rural and Minority Populations

The 2020 Census used differential privacy—injecting random noise into counts to prevent individual re-identification—but the noise has measurable impact on small geographies and demographic subgroups. Rural townships and ethnic minorities absorb larger statistical error than large populations. Errors propagate into redistricting, federal funding tied to population counts, and public health surveillance, affecting communities least able to absorb inaccuracy.