Todd Milewski:

he number of students that have left Madison schools for other districts through the state’s public school open enrollment program has grown every year since 2005.
But which schools are those students leaving? Our graphic below uses Madison Metropolitan School District data to show the number of leavers — the term used for students who live in the Madison district but go to school in another — by which school’s attendance area they live in. (Note that the open enrollment program doesn’t apply to students who leave for private schools or to be home-schooled.)
By percentage of enrollment, the schools with the most leavers were Glendale Elementary (83, 17.5 percent), Leopold Elementary (67, 10.2 percent), Toki Middle (48, 9.4 percent) and La Follette High (121, 8.2 percent). Memorial High has the highest number of leavers at 134, but its higher enrollment put it only eighth when ranked by percentage (7.3 percent).
Of the 1,041 leavers for the 2012-13 school year, 494 were from elementary schools, 188 were in the middle school grades 6 through 8 and 359 were at the high school level.
The Monona Grove School District was the most popular destination for the leavers, followed closely by Verona and McFarland. Students left Madison for 25 districts, but data for how many attended each was not fully available because the district can’t report small numbers due to privacy concerns.

Much more on outbound open enrollment here.