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NAEP Technical DocumentationFourth- and Eighth-Grade Schools and Enrollment in the 2024 Private School Mathematics and Reading Sampling Frame
The following table presents the number of fourth- and eighth-grade private schools and their estimated enrollment as contained in the Private School Universe Survey (PSS)-based sampling frames, by private school affiliation, for the national mathematics and reading assessments. Grade-specific enrollment was estimated for each school as the average grade enrollment for grades 1 through 8.
The counts in this table are for schools with known affiliation. Schools with unknown affiliation do not appear in the table because their grade span, affiliation, and enrollment were unknown. Although PSS is a school universe survey, participation is voluntary and not all private schools respond. Since the NAEP sample must represent all private schools, not just PSS respondents, a small sample of PSS nonrespondents with unknown affiliation was selected for each of the targeted grades to improve NAEP coverage.
| Grade | Affiliation | Number of schools | Estimated enrollment |
|---|---|---|---|
| 4 | Total | 18,308 | 328,979 |
| Catholic | 4,600 | 117,514 | |
| Non-Catholic | 13,708 | 211,465 | |
| 8 | Total | 16,919 | 324,541 |
| Catholic | 4,276 | 119,547 | |
| Non-Catholic | 12,643 | 204,994 | |
| SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2024 National Mathematics and Reading Assessments. | |||
Last updated 24 November 2025 (SK)