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Percentage of public school teachers who indicated that they were members of a union or an employee association similar to a union,
by selected school characteristics: 2017–18

Selected school
characteristic
Member of a union or
employee association
 
   All public schools 69.4  
   
School classification  
Traditional public 72.1  
Charter school 24.4  
   
Community type   
City 68.6  
Suburban  74.8  
Town  66.6  
Rural  61.7  
   
School level  
Primary 69.3  
Middle 70.7  
High 71.9  
Combined 56.0  
   
Student enrollment  
Less than 100 62.8  
100–199 59.8  
200–499 70.6  
500–749 69.1  
750–999 68.6  
1,000 or more 70.3  
   
Percent of K–12 students who were approved
for free or reduced‑price lunches
 
0–34 72.6  
35–49 70.1  
50–74 66.6  
75 or more 67.9  
SOURCE: U.S. Department of Education, National Center for Education Statistics, National Teacher and Principal Survey (NTPS), "Public School Teacher Data File," 2017–18.