Skip Navigation

Were you contacted about the 2020-21 NTPS? Please contact ntps@census.gov or 1-888-595-1338 for more information.

Check here for updates on the status of future collections

Average class size in public schools, by class type and state: 2017–18

  Primary schools   Middle schools   High schools   Combined grade schools  
State Average class size for teachers in self-contained classes   Average class size for teachers in departmentalized instruction   Average class size for teachers in self-contained classes   Average class size for teachers in departmentalized instruction   Average class size for teachers in self-contained classes   Average class size for teachers in departmentalized instruction   Average class size for teachers in self-contained classes   Average class size for teachers in departmentalized instruction  
United States 20.9   26.2   16.6   24.9   16.3   23.3   15.6   18.6  
                                 
Alabama 19.9   25.1   8.1   27.6   27.3   22.3   15.2   20.9  
Alaska 21.6   22.9   11.9   24.8     18.4   13.3   10.3  
Arizona 23.9   29.5   11.0   26.2   21.9   25.4   20.4   21.9  
Arkansas 20.4   26.9   11.0   26.4   17.5   20.4   16.6   15.8  
California 24.2   29.2   22.3   31.1   18.3   29.3   19.0   22.7  
                                 
Colorado 22.8   23.1   21.0   25.8   18.4   24.3   19.5   18.8  
Connecticut 19.4   22.9     20.7   14.5   21.5   18.0   12.9  
Delaware 19.8   26.8   14.3   25.7   7.0   22.5   5.3   22.9  
District of Columbia                
Florida 18.9   24.7   14.7   24.8   17.6   26.0   17.2   22.6  
                                 
Georgia 19.3   30.7   11.9   26.4   18.7   25.2     19.6  
Hawaii 20.6   29.8   11.9   24.5   10.2   23.8   19.1   18.5  
Idaho 23.5   24.4   19.6   26.0   11.1   23.5   15.3   17.3  
Illinois 21.8   25.5   21.3   26.0   13.6   22.4   11.7   16.1  
Indiana 21.8   30.8   11.2   26.2   15.3   23.7   7.5   19.2  
                                 
Iowa 20.8   22.0   17.5   28.4   13.7 ! 23.0   17.1   15.7  
Kansas 19.7   21.8   34.1 ! 22.3   15.9   19.8   26.3 ! 13.4  
Kentucky 20.7   23.6   #   26.1   11.6   21.8   12.0   25.1  
Louisiana 17.9   25.5     20.4   15.5 ! 20.9   16.4   19.9  
Maine 17.8   17.2   8.6   19.0   7.7   15.3   12.6   18.0 !
                                 
Maryland                
Massachusetts 19.7   21.8   11.3   22.9   11.1   20.9   24.2   23.2  
Michigan 23.7   33.5   14.2   27.4   28.3 ! 26.4   13.9   19.6  
Minnesota 22.4   26.0   22.1   27.3   16.0   24.7   14.6   21.6  
Mississippi 20.7   17.9   4.7 ! 21.0   6.9   20.8   14.8   18.7  
                                 
Missouri 20.2   26.1   12.0   20.7   15.0   22.5   16.0   17.7  
Montana 18.5   24.7   14.3   24.3   16.5   19.7   11.9   10.0  
Nebraska 18.9   19.7   13.8   21.2   11.3 ! 18.2   15.4   13.5  
Nevada 22.5   28.9   7.1 ! 31.9   13.7   28.8   16.1   17.3  
New Hampshire 20.1   21.8   26.1   19.3   15.6   17.0   19.0   15.5  
                                 
New Jersey 18.5   24.9   16.9   22.5   11.3   20.6   12.4   21.4  
New Mexico 19.1   24.6   12.8   20.8   16.6 ! 20.5   15.7   15.7  
New York 20.2   25.0   17.0   22.7   12.0   22.0   10.9   18.0  
North Carolina 19.6   24.1     24.6   15.4   20.8   21.8   22.1  
North Dakota 19.3   20.4   41.8 ! 20.2   9.9   19.3   14.7   15.4  
                                 
Ohio 20.9   24.1   12.8 ! 25.3   14.8   20.7   19.5   16.8  
Oklahoma 21.9   22.5   8.4   22.5   17.4   23.8   15.5   18.2  
Oregon 24.5   22.3   10.0   27.8   25.9   25.9   13.8   19.1  
Pennsylvania 20.6   24.7   10.4   23.3   20.3   22.0   25.8 ! 20.8  
Rhode Island 20.3   23.8   13.7   24.9   10.7   21.0   18.0   19.4  
                                 
South Carolina 20.4   32.9   10.6   21.9   16.4   22.0   7.0   19.8  
South Dakota 20.0   16.0   6.8 ! 27.4   14.3 ! 21.2   14.6   17.1  
Tennessee 19.2   24.9   13.8   26.1   22.4   21.8   10.9   20.7  
Texas 18.9   30.3   20.3   22.9   15.8   22.7   14.6   17.0  
Utah 24.4   38.5   24.1 ! 28.9   16.3   28.1   22.5   21.8  
                                 
Vermont 16.4   20.1   #   19.1   17.0 ! 14.7   17.0   12.8  
Virginia 19.3   23.9     25.0   13.5   21.0   7.6   8.3  
Washington 21.3   28.3   16.1 ! 26.8   15.8 ! 23.9   11.2   16.1  
West Virginia 19.9   25.9   11.6 ! 23.8   15.9   20.5   12.5   8.5  
Wisconsin 20.3   24.9   11.2 ! 26.1   17.9   23.5   18.1   17.9  
Wyoming 18.3   22.0   4.7 ! 21.7   16.6 ! 18.6   12.0   15.2  
# Rounds to zero.
! Interpret data with caution. The coefficient of variation (CV) for this estimate is between 30 percent and 50 percent (i.e., the standard error is at least 30 percent and less than 50 percent of the estimate).
‡ Reporting standards not met. The coefficient of variation (CV) for this estimate is 50 percent or greater (i.e., the standard error is 50 percent or more of the estimate) or the response rate is below 50 percent.
NOTE: Self-contained classes are defined as instruction to the same group of students all or most of the day in multiple subjects, and departmentalized instruction is defined as instruction to several classes of different students most or all of the day in one or more subjects. Among all public school teachers, 25 percent teach self-contained classes in primary schools, 1 percent in middle schools, 1 percent in high schools, and 1 percent in combined schools; 8 percent teach departmentalized classes in primary schools, 14 percent in middle schools, 24 percent in high schools, and 4 percent in combined schools; 15 percent teach other types of classes, such as elementary subject specialist classes, team-taught classes, and "pull-out" or "push-in" classes in primary schools, 3 percent in middle schools, 3 percent in high schools, and 1 percent in combined schools.
SOURCE: U.S. Department of Education, National Center for Education Statistics, National Teacher and Principal Survey (NTPS), "Public School Teacher Data File," 2017–18.