Emily Bonilla is worried her district in metro Orlando will be undercounted during next spring’s once-in-a-decade head count of everybody in the United States because of who lives there: new arrivals, immigrants, the poor, renters and rural residents who sometimes regard government with suspicion.

“We’re growing so fast that I know we have more people in the area than the data is stating. This area already is undercounted,” said Bonilla, a county commissioner in one of the fastest-growing metro areas in the U.S.