Ylivieska is a Finnish city located in the southwestern part of the province of Northern Ostrobothnia, close to the border of Central and Northern Ostrobothnia. Ylivieska is a city that grew up at the crossroads of railways, on the banks of the Kalajoki River. The city has a population of 15,312 and an area of ​​573.42 km², of which 4.50 km² are water bodies. The population density is 26.91 inhabitants / km². The neighboring municipalities of Ylivieska are Alavieska, Haapavesi, Kalajoki, Nivala, Oulainen, Merijärvi and Sievi. Ylivieska is the central city of the region called Southern Oulu, and the regional center of the region, Oulu, is the regional center of the Southern region of Oulu and the whole of Northern Finland.

In autumn 2013, Ylivieska conducted a municipal survey with the municipality of Alavieska and the cities of Haapavesi and Oulainen. If implemented, the area would form a city of more than 30,000 inhabitants. Other municipalities and cities in the area were also asked to participate in the initiated municipal survey.

In the past, when the provinces were not the official levels of government, the province of Central Ostrobothnia often included the southwestern part of the province of Northern Ostrobothnia formed by the Kalajoki Valley. At that time, Ylivieska was one of the most important centers in Central Ostrobothnia.

The coat of arms of Ylivieska was designed by Ahti Hammar. It depicts a blue, clover-headed fork cross. The silver color represents water.