<Tr> <Td> 18 </Td> <Td> Ondo State </Td> <Td> 3,441,024 </Td> </Tr> <Tr> <Td> 19 </Td> <Td> Osun State </Td> <Td> 3,423,535 </Td> </Tr> <Tr> <Td> 20 </Td> <Td> Kogi State </Td> <Td> 3,278,487 </Td> </Tr> <Tr> <Td> 21 </Td> <Td> Zamfara State </Td> <Td> 3,259,846 </Td> </Tr>

When was the last population census conducted in nigeria