| Total | 50.8 | | 95.4 | | 1.9 | | 2.6 | |
| | | | | | | | | |
| NCES typology | | | | | | | | |
| Catholic | 50.1 | | 94.0 | | 3.2 | | 2.7 | |
| Parochial | 49.7 | | 99.0 | | 0.8 | | ‡ | |
| Diocesan | 50.0 | | 97.3 | | 1.3 | | 1.4 | |
| Private | 51.4 | | 65.7 | | 18.3 | | 16.0 | |
| | | | | | | | | |
| Other religious | 50.7 | | 96.6 | | 1.4 | | 2.1 | |
| Conservative Christian | 50.2 | | 99.4 | | 0.3 | | 0.3 | |
| Affiliated | 50.2 | | 92.0 | | 3.3 | | 4.6 | |
| Unaffiliated | 52.3 | | 96.6 | | 1.2 | | 2.2 | |
| | | | | | | | | |
| Nonsectarian | 53.0 | | 94.6 | | 1.7 | | 3.7 | |
| Regular | 50.7 | | 94.7 | | 2.5 | | 2.8 | |
| Special emphasis | 51.5 | | 97.3 | | 0.8 | | 2.0 | |
| Special education | 69.3 | | 89.7 | | 2.0 | | 8.3 | ! |
| | | | | | | | | |
| School level | | | | | | | | |
| Elementary | 50.7 | | 98.8 | | 0.5 | | 0.8 | |
| Secondary | 51.7 | | 75.0 | | 11.5 | | 13.5 | |
| Combined | 50.7 | | 95.8 | | 1.6 | | 2.6 | |
| | | | | | | | | |
| Program emphasis | | | | | | | | |
| Regular elementary/secondary | 50.4 | | 95.8 | | 2.0 | | 2.2 | |
| Montessori | 50.1 | | 99.9 | | 0.0 | | ‡ | |
| Special program emphasis | 51.1 | | 94.0 | | 2.1 | | 3.8 | |
| Special education | 68.7 | | 89.9 | | 2.0 | | 8.1 | |
| Vocational/technical | ‡ | | ‡ | | ‡ | | ‡ | |
| Alternative | 55.0 | | 90.8 | | 3.1 | | 6.1 | |
| Early childhood | 32.3 | | 100.0 | | 0.0 | | 0.0 | |
| | | | | | | | | |
| Size (number of students) | | | | | | | | |
| Less than 50 | 53.1 | | 96.2 | | 1.2 | | 2.6 | |
| 50–149 | 53.2 | | 96.8 | | 0.9 | | 2.2 | |
| 150–299 | 50.5 | | 96.6 | | 1.7 | | 1.8 | |
| 300–499 | 49.2 | | 93.3 | | 4.5 | | 2.2 | |
| 500–749 | 48.2 | | 88.6 | | 7.2 | | 4.2 | |
| 750 or more | 53.2 | | 81.9 | | 5.9 | | 12.2 | |
| | | | | | | | | |
| Region | | | | | | | | |
| Northeast | 50.8 | | 90.0 | | 4.2 | | 5.8 | |
| Midwest | 51.1 | | 97.7 | | 1.1 | | 1.2 | |
| South | 51.1 | | 96.5 | | 1.4 | | 2.1 | |
| West | 50.2 | | 97.0 | | 1.5 | | 1.6 | |
| | | | | | | | | |
| Urbanicity type | | | | | | | | |
| City | 50.6 | | 93.0 | | 3.2 | | 3.8 | |
| Suburban | 50.8 | | 95.7 | | 2.0 | | 2.3 | |
| Town | 50.8 | | 99.2 | | ‡ | | 0.6 | |
| Rural | 52.0 | | 96.8 | | 0.8 | | 2.3 | |
| ! Interpret data with caution. The coefficient of variation for this estimate is larger than 25 percent. |
| ‡ Reporting standards not met. |
| NOTE: These estimates do not include private schools for which kindergarten is the highest grade. Detail may not sum to totals because of rounding. |
| SOURCE: U.S. Department of Education, National Center for Education Statistics, Private School Universe Survey (PSS), 2005–2006. |