A school that had just 17 pupils will not reopen in the new academic year.
Rapidly declining student numbers means Cantley Primary has been closed by Norfolk County Council and merged with Freethorpe Primary, which is also run by AIM Federation of Schools.
The authority warned falling birth rates both locally and nationally could see more schools affected as funding was linked to student numbers.
"We have to put the children's education first and we just can't see how Cantley can continue to provide a good education with so few children," said Penny Carpenter, councillor for children's services.