ORLANDO, Fla. (AP) — A federal judge has stopped the 2020 census from finishing at the end of September and ordered the once-a-decade head count of every U.S. resident to continue for another month through the end of October, saying a shortened schedule likely would produce inaccurate results.

U.S. District Judge Lucy Koh in California made her ruling late Thursday, two days after hearing arguments from attorneys for the Census Bureau, and attorneys for civil rights groups and local governments that had sued the statistical agency in an effort to halt the 2020 census from stopping at the end o...