Estimates of contact rates and mixing patterns among school-aged children may be informative for acute respiratory infectious disease surveillance as well as prevention and control activities. We collected contact data from children at school and non-school settings using objective proximity sensors and self-report surveys and logs. Contact rates for school-aged children are variable across settings and among classrooms within schools. Quantifying this variability can be beneficial in better understanding transmission dynamics of acute respiratory diseases and lead to improved surveillance, as well as control and prevention strategies.