The town was captured by the Greek 7th Infantry Division in 1912, during the First Balkan War, and has been part of Greece since then. With the population exchange between Greece and Turkey in 1923, the town's Muslims left, and Greek refugees, particularly from Eastern Thrace and Greek Evangelicals from Asia Minor, took their place, almost doubling the town's population from 5,540 in 1920 to 10,138 in 1928.
Katerini is the administrative and economic centre of Pieria. The Chamber of commerce and industry of Pieria is based in Katerini. The same applies for the Union of Agricultural Cooperatives of Pieria and the Union of hotel owners of Pieria.
Agriculture
Katerini lies in the middle of a plain and thus, it is greatly an agricultural town. As of 2000 26,775 people were occupied in agriculture, in Pieria. The Union of Agricultural Cooperatives of Pieria has 9,000 members, of which 2,000 grow tobacco. Kiwifruit is also produced in Katerini.
Tourism
Katerini is a popular tourist destination, that attracts tourist both from Greece and abroad. Within the boundaries of the municipality, there are over 230 hotels that can accommodate more that 8,600 people. The vast majority of the tourist infrastructure lie in Paralia and Olympiaki Akti and it also includes tens of tavernas and cafes. Winter tourism has started developing in the area, since the construction of the Elatochori ski resort.
Source: wikipedia.org