Education experts have described the rates of school absence in parts of the South West as a "really serious issue".
According to Ofsted, schools in Cornwall, Plymouth and Torbay had rates of persistent absence - meaning pupils attend fewer than 90% of classes - of about 23% in autumn 2023 and spring 2024, putting them among the highest in England.
Lee Elliot Major, professor of social mobility at the University of Exeter, said children who missed lessons regularly were at risk of falling behind.
The Department for Education (DfE) said it was working with Ofsted to improve the absence figures which cover state-funded primary, secondary and special schools.