The town is first documented in the year 786 as Willa, a name which is thought to be of Roman origin. Agriculture dominated local industry until the 19th century, when the city began to grow, aided by its favourable transport connections. A railway marshalling yard linking Weil am Rhein to Basel was built in 1913. Swiss textile factories were established in the Friedlingen quarter. 1934 saw the construction of a harbour on the Rhine. After the Second World War the population again grew rapidly due to the influx of refugees and stateless persons. Between 1971 and 1975 the communities of Ötlingen, Haltingen and Märkt were incorporated and Weil am Rhein became a substantial town.