As of January 2011, the town has 668 inhabitants.
A road over Fjarðarheiði mountain pass connects Seyðisfjörður to the rest of Iceland; to the ring road and Egilsstaðir. Seyðisfjörður is surrounded by mountains on all sides with most prominent Mt. Bjólfur to the West (1085m) and Strandartindur (1010m) to the East. The fjord itself is accessible on each side from the town, by following the main road that leads through the town. Further out the fjord is fairly remote but rich with natural interests including puffin colonies and ruins of former activity such as nearby Vestdalseyri, from where the local church was transported.