Which state has highest child labour cases in India?

Uttar Pradesh
Uttar Pradesh has highest child labour cases in the country. As per the latest study, more than half of working children in India are concentrated in five states namely Bihar, Uttar Pradesh, Rajasthan, Madhya Pradesh and Maharashtra. These states account for more than 55 lakh of child workers. Out of these five states, only Uttar Pradesh has witnessed a growth in child labour by 13 per cent with one out of five child labourers in India belonging to the state. Reference