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Table 7. Average class size in public primary schools, middle schools, high schools, and schools with combined grades, by classroom type and state: 2011–12


  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 21.6   26.2   16.7   25.5   17.7   24.2   16.6   19.0  
                                 
Alabama 19.4   29.4   11.0   28.4   29.4 ! 23.0   17.0   19.0  
Alaska 21.1   17.4   4.0   21.8   14.7 ! 20.3   13.4   10.2  
Arizona 24.5   25.3   10.9   26.2   23.5   25.9   20.1   19.5  
Arkansas 20.4   22.8   13.9   23.1   19.9   20.5   19.5   19.8  
California 25.4   28.2   23.4   30.7   20.6   30.0   19.0   21.9  
                                 
Colorado 23.3   26.1   16.6   26.1   16.7 ! 27.9   17.3   22.1  
Connecticut 20.1   22.2   17.8   22.2   17.4 ! 19.9     19.1  
Delaware 21.1   31.3     25.3   16.0   23.6   6.2   17.0  
District of Columbia                
Florida                
                                 
Georgia 21.2   24.3   14.8   24.4   7.2 ! 25.4   13.7   17.6  
Hawaii                
Idaho 25.1   27.8   19.3   25.9   15.8   22.2   18.3   19.1  
Illinois 23.5   24.8   14.4   24.9   10.8   26.4   14.7   18.5  
Indiana 21.7   35.1   18.3   25.8   14.4   23.6   17.0   18.9  
                                 
Iowa 20.9   21.5   15.6   27.8   12.2   22.8   16.0   21.0  
Kansas 20.7   20.6   13.6   24.0   20.7   19.7   17.5   16.0  
Kentucky 23.7   23.5   7.3   26.9   18.7   23.6   15.1   18.0  
Louisiana 19.4   21.3   8.6 ! 23.4     22.5   17.7   16.7  
Maine 17.8   18.4 ! 12.3   21.6   16.1   16.7   9.5   13.4  
                                 
Maryland                
Massachusetts 20.1   32.2   16.5   25.0   15.4   22.0   19.2 ! 19.3  
Michigan 25.7   36.0   25.2   28.0   27.8   27.3   13.8   20.4  
Minnesota 23.7   31.0   23.5 ! 29.5   21.9   27.0   16.8   23.1  
Mississippi 22.1   25.5     22.5   9.3   19.7   15.2   17.0  
                                 
Missouri 20.7   23.5   18.4   25.9   14.1   21.8   17.1   19.5  
Montana 20.5   17.7   16.4   24.0   19.1   20.6   12.8   12.5  
Nebraska 19.0   18.3   14.6   25.6   17.4   21.4   15.2   16.5  
Nevada 26.1   54.4 ! 10.2 ! 31.8   23.9 ! 31.2   13.4 ! 25.4  
New Hampshire 21.2   16.6   20.0 ! 23.5   15.1 ! 19.7   10.9   13.0  
                                 
New Jersey 19.0   20.4   10.8   24.6   12.7   21.9   7.9   20.4  
New Mexico 20.5   19.8 ! 13.5 ! 23.2   27.9 ! 22.0   14.4   13.3  
New York 21.5   25.9   13.8   24.5   17.4   22.5   12.9 ! 19.2  
North Carolina 19.8   32.8   14.9   25.5   9.9   24.3   19.7   19.7  
North Dakota 19.3   24.7   10.9   20.9   26.1 ! 18.4   14.5   14.2  
                                 
Ohio 21.8   24.0   17.1   25.6   19.3   23.6   19.1   20.2  
Oklahoma 21.1   27.5   16.0   25.4   15.9   19.8   17.5   17.7  
Oregon 26.7   24.1   29.2   28.8   16.2   28.1   18.2   15.3  
Pennsylvania 22.6   28.1   13.0   24.9   16.0   21.4   27.2 ! 20.7  
Rhode Island                
                                 
South Carolina 19.4   28.4   8.6   23.9   9.5   22.4   20.0   15.2  
South Dakota 21.7   22.3     24.8   18.6   20.9   16.7   15.8  
Tennessee 17.8   31.4   15.9 ! 25.4   18.1 ! 24.6   18.5   20.5  
Texas 18.6   26.4   13.4   24.4   18.0 ! 23.6   15.1   16.8  
Utah 27.6   8.3   19.6   29.4   25.4   29.0   21.9   28.6 !
                                 
Vermont 16.7   19.3   16.8   20.9   12.7   17.7   14.2   10.9  
Virginia 20.4   28.9   15.6 ! 22.3   14.3   22.8   13.7 ! 10.3  
Washington 23.9   37.0   29.1   27.0   28.5   27.0   17.7   15.4  
West Virginia 19.2   27.8   9.1 ! 23.5   8.9 ! 19.8   19.8 ! 20.3  
Wisconsin 20.8   35.2 ! 24.7   28.4   15.7   23.2   21.6 ! 19.9  
Wyoming 17.4     11.9   21.3   8.5   17.8   13.4   12.9  
! 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, 27 percent teach self–contained classes in primary schools, 1 percent in middle schools, 1 percent in high schools, and 1 percent in combined schools; 7 percent teach departmentalized classes in primary schools, 14 percent in middle schools, 25 percent in high schools, and 4 percent in combined schools; 14 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, 2 percent in high schools, and 1 percent in combined schools.
SOURCE: U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey (SASS), "Public School Teacher Data File," 2011–12.


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