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Marin County remains on the most restrictive tier of the state’s new reopening guidelines, but its COVID-19 case data are improving, and 15 elementary schools will open on Tuesday for in-person classes, according to a county statement on Thursday.

The county’s public health officer has approved applications from public and private schools in Marin City, San Rafael, San Anselmo, Mill Valley, Chileno Valley, Hicks Valley, and Sausalito.

Special education and alternative education programs countywide also will reopen on Tuesday, and another 11 schools that applied to reopen will learn soon whether they can, according to the statement.

All other schools in Marin County will be able to reopen two weeks after the county shifts to the second tier of COVID-19 reopening. County officials said they could learn as soon as Friday that Marin has met the criteria to move to the next tier.

“The progress we’ve made is making it possible to consider school reopenings,” said Dr. Matt Willis, Marin County’s public health officer. “We’re at a critical juncture, and our ability to get kids back into school is up to all of us. It’s not time to relax our protective measures.”

More information is available on the county health department website, www.marinhhs.org, and on the county’s emergency preparedness website,