Charter school supporters and advocates frequently point to the broad choices that families have when seeking a school in New Orleans, where most of the 82 public schools are charters and most accept applications from across the city. But the concept of choice butts against the reality of supply and demand in a city where many schools rate only average or below.

Nearly 12,000 children in New Orleans chose their desired schools through the city’s mostly unified enrollment system this spring — but only half got their No. 1 choice, according to recently released results.

About 30 percent got their second, third or up-to-eighth choice, the most applicants can rank. The remaining 20 percent or so were not matched to any requested school; half of them will stay at their current school and the other half will go through the second round of the enrollment process.

After parents submit applications at the end of February, it’s a waiting game for five weeks until an email reveals their placement — and whether it’s their top choice.

Marta Jewson covers education in New Orleans for The Lens. She began her reporting career covering charter schools for The Lens and helped found the hyperlocal news site Mid-City Messenger. Jewson returned...