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

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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.

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