Šiauliai is a city in northern Lithuania, the country's fourth largest city and the sixth largest city in the Baltic States, with a population of 108,000 …Šiauliai is a city in northern Lithuania, the country's fourth largest city and the sixth largest city in the Baltic States, with a population of 108,000 in 2023. From 1994 to 2010 it was the capital of Šiauliai County.