Strömstad occupies the northern edge of Bohuslän, where the town’s working harbour faces a scatter of islands and the Norwegian border lies close across the sea. The harbour is not just scenery: ferries connect the mainland with the Koster Islands, while cross-border movement has shaped trade, employment and everyday life for generations. Statistics Sweden’s preliminary register counted 13,636 people in Strömstad Municipality on 30 June 2026. That total covers the town, islands and rural communities, not only the central streets.
The town’s story begins in the 17th century, not in Roman antiquity. After Bohuslän became Swedish in 1658, the authorities wanted a Swedish trading centre in the province’s north, close to the new Norwegian border. Strömstad became a market town in 1667, was established as a town in 1672 and had its privileges confirmed in 1676. Its position made it both a port and a frontier settlement. The wider region had changed hands repeatedly in earlier conflicts, and the municipality distinguishes this documented urban history from older archaeological sites elsewhere in the area, such as rock carvings and burial monuments. Those remains enrich the history of Bohuslän, but do not prove that today’s town was founded in prehistoric or Roman times.
War and commerce left distinct traces. Strömstad served as one of King Karl XII’s headquarters during campaigns against Norway in 1716–18; in 1717, a Danish-Norwegian naval force attacked the town. Later, the herring boom brought an economic lift. By the 1780s Strömstad was becoming a seaside health resort, and the municipal timeline dates Sweden’s first warm bathhouse to 1786. Shipping and fishing remained central in the 19th century, followed in the 20th by retail, services, canning and mechanical workshops. Today, harbour quays, small commercial streets and civic buildings reflect these layers. The municipality’s heritage guide describes maritime, commercial, military and industrial traces. The Strömstad Museum and its open-air museum add context; opening dates vary, so check ahead. A digital city walk is another way to connect historic buildings and outdoor art without joining a scheduled tour.
Beyond the harbour lies the area’s signature natural landscape. Kosterhavet National Park, Sweden’s first marine national park, was inaugurated in 2009 and covers almost 400 square kilometres across Strömstad and Tanum municipalities. Nearly all of it is water. Park authorities describe habitats from shallow eelgrass meadows to the deep Koster Trench, with around 6,000 animal, plant and algae species; nearly 300 are not found elsewhere in Sweden, and one of the country’s two known living coral reefs lies here. This is also a working sea: small-scale fishing, shellfish, shipping, research and recreation continue under conservation rules. Naturum Koster on South Koster introduces the area’s ecology. Visitors should follow current rules on wildlife, fishing and anchoring, and avoid assuming that protection means the sea is a closed museum.
The two main Koster Islands lie about ten kilometres offshore. The municipality says the boat crossing takes 30 to 60 minutes and around 300 people live on the islands year-round, most on South Koster. The southern island is greener, with woodland and cultivated ground; North Koster is more exposed, with open walking routes and bathing coves. Västtrafik’s Koster boats sail from Strömstad’s North Harbour to several jetties on both islands. Ekenäs on South Koster is a useful arrival point for Naturum and visitor services, while a cable ferry connects the islands across the sound. Walking or hiring a bicycle makes it easier to explore without trying to cover both islands in a rushed day trip. Boat frequency varies by season; check live departures, fares, bike rules and disruptions in Västtrafik’s trip planner.
Strömstad’s economy still reflects its border and its waters. The municipality identifies trade and visitor services as major sectors, with shopping supported by Norwegian customers and a long coastal tourism tradition. Its current business strategy also highlights marine and maritime industries, sustainable fisheries and seafood. Shrimp, crab, lobster and Norway lobster are among the locally important catches and part of the area’s food culture. Hotels, restaurants, shops and boat operators support visitors, while Strömstad remains a service centre for the whole municipality. Cross-border exchange is practical as well as cultural: the municipality describes movement of people, goods and workers in both directions between Strömstad and Norway.
The town sits between Oslo and Gothenburg. Bohusbanan runs south from Strömstad, and several bus services use the E6 corridor; planned rail work can bring replacement buses or changed stops, so check current notices before travelling. From central Strömstad, Västtrafik’s boats reach North and South Koster. In summer, allow extra time to get to the harbour, and use the municipality’s designated long-stay parking if leaving a car overnight for an island stay. A rewarding visit might begin with the harbour and museum, continue by ferry to one Koster island rather than racing across both, and leave time to understand how fishing and nature protection coexist. Strömstad’s appeal lies in this meeting of town, border and sea: a working port beside an unusually rich marine landscape.