Giridih District is the top region by average household size in India. As of 2011, average household size in Giridih District was 6.17 that accounts for 4.86% of India's average household size. The top 5 regions (others are Kodarma District, Chatra District, Hazaribagh, and Deoghar District) account for 23.16% of it. India's total average household size was estimated at 126.88 in 2011.