From the Latvian Wikipedia page 
Šiaulėnai subdistrict is located in the west of the Radviliškis district.
From the Estonian Wikipedia page 
The area of the municipality is 199 km². In 2011 there were 1,592 people living there. The center of the municipality is Šiaulėnai Alevi (there were 751 inhabitants in 2011), the address of the rural municipality is Dvaro g. 2. The mayor is Ieva Bliznikienė.