Central Falls, R.I., Mayor James Diossa says he’s seeing signs that noncitizens, especially undocumented immigrants, will be undercounted during the 2020 census. Many residents in his city are reluctant to take part in a test run of the headcount.

Central Falls, R.I., Mayor James Diossa says he’s seeing signs that noncitizens, especially undocumented immigrants, will be undercounted during the 2020 census. Many residents in his city are reluctant to take part in a test run of the headcount.