The United States Census Bureau released a raft of 2020 demographic data this month, allowing states and counties to begin a frantic process of redistricting that was delayed because of the pandemic. Marin County now has about four months to finalize its supervisorial district map. The data shows that in the past decade, the county grew at a rate of around 4 percent, lower than California’s overall growth rate of 6 percent. Like the nation, Marin became less white, dropping from 73 percent white in 2010 to 66 percent white last year. The Hispanic or Latino share of the population grew by 3 percentage points, up to almost 20 percent. But the county remains much less diverse than California as a whole, and is the least diverse of the nine Bay Area counties. Marin ranks 38th in the state in terms of diversity, while nearby Solano County is the most diverse. Marin has been planning the hasty redistricting process for months, but won’t be able to respond to the new census data for several more weeks. The state government will take more than a month to adjust the data according to a reform that redistributes incarcerated populations to their original places of residence. The loss of San Quentin’s prison population will force the county to redraw the lines of its fourth supervisorial district, but exactly how is unclear. On top of that, the Census Bureau released the data in a preliminary format that is much less user-friendly than usual. “All of the demographers in the nation are busy scrambling to get that data processed,” said Chris Skinnell, special counsel to the county on the redistricting process. “Some time in the next week or two, we’ll have some better idea of where it is.”