Dingzhou (China) is 75% larger than Tonga.
Area: 747 km2 World Factbook
Population: 106,440 (July 2014) World Factbook
Tonga, officially the Kingdom of Tonga, is a Polynesian sovereign state and archipelago comprising 176 islands with a surface area of about 750 square kilometres scattered over 700,000 square kilometres of the southern Pacific Ocean, of which 52 are inhabited by its 103,000 people. Wikipedia
Area: 1,309 km2 calculated
Dingzhou is a county-level city in the southwest of Hebei province, People's Republic of China. Dingzhou is administered under Baoding City, about halfway between Baoding and Shijiazhuang and had population of 1,200,000 in 2009. Wikipedia