Charter School Market Share


Data Available: 2005-06 through 2011-12

Annually, NAPCS releases a market share report that ranks school districts by the percentage and total number of students enrolled in charter schools. This section of the Dashboard presents data from the market share reports.

Notes on the data:

  • School districts must have at least 10,000 students enrolled in all public schools (both charter and non-charter) to be included in the report.
  • NAPCS geocodes charter schools in independent LEAs to the geographically relevant traditional public school district by mapping physical charter school addresses onto school district boundary maps available through the U.S. Census Bureau.
  • For Michigan and Ohio in the market share report, NAPCS uses student residential enrollment data that indicate the total number of students attending charter schools based on the district where students reside. As a result, the total number of students in charter schools in districts in these two states may not be the same as the total enrollment reported on district pages on the Dashboard where we present the total number of students enrolled in charter schools physically located in the school district boundaries.
  • The growing numbers of virtual charter schools enrolling children from across an entire state presents another issue. Because many states haven’t developed student enrollment reporting systems that allow the sorting of individual students by community of residence at each charter school, we excluded virtual school enrollment data from both the charter and total district enrollment data when calculating market share percentages. We recognize that this decision might create some undercounting in school districts where large numbers of students are enrolled in virtual charter schools. We do include enrollment from virtual schools in the District of Columbia and Hawaii where there is only one school district in the states and in Michigan and Ohio where we have resident enrollment data and we know the district where students live.

2012-2013 National

This metric only has data at the national level.