More than half the school districts in the four-county Milwaukee metro area saw enrollment decreases at the start of this school year, according to data released by the state last week that provides a preliminary count of kids in public schools this year.

But while many traditional districts adjust for fewer students, enrollment is up - way up - in some of Wisconsin's largest virtual charter schools, where students do most or all instruction online and don't need to live anywhere near the district where that school is located.