Múlaþing is not really a town, but a municipality. Egilsstaðir is the largest town within that municipality but only around 3000 people live there. I think Seltjarnarnes should rank 10th, with 4572 people as of 2024.
The numbers for Selfoss are inaccurate as it's the same as the whole of Árborg (a larger municipality) which also contains the towns of Eyrarbakki and Stokkseyri as well as the farms surrounding those towns.
The numbers for Selfoss are inaccurate as it's the same as the whole of Árborg (a larger municipality) which also contains the towns of Eyrarbakki and Stokkseyri as well as the farms surrounding those towns.