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Haslev started out being a small village named Hasle with a few houses and streets surrounding the church. It is mentioned for the first time in 1328 as Haslæ and in the Bishop of Roskilde's Urbarium 1370-80 as Hasle and Haslæ.[3] The name was later changed to Haslev to avoid confusion with other similar town names in Denmark.
In 1870, the railway line passing Haslev town was inaugurated. At that time, Haslev had only 653 inhabitants. A street named Jernbanegade (Railway Street) was paved, to connect the church with the newly built train station. In the years that followed, the street became the main street of the town with shops, banks and so forth. In 1911, the town had 3,668 inhabitants. In the 1980s, a square in the middle of the street was constructed.
During the 20th century Haslev grew rapidly, becoming a center for the Church Association for the Inner Mission in Denmark. The latter built a folk high school, sixth-form college (with a boarding school) among others. In the 1970s and 1980s, the schools became independent of the founding association. Today, there are only few remains of the Inner Mission in Haslev.
In the early 1970s and onwards, an entrepreneur named Ole Christiansen founded whole new neighbourhoods of one-family houses with an attached garden at a low expense. This encouraged many families from all over Zealand, and especially Copenhagen, to move to Haslev.
^Søndergaard, Bent (1972). Indledende studier over den nordiske stednavnetype lev (lov). Navnestudier udgivet af Institut for Navneforskning (in Danish). Vol. 10. Copenhagen. p. 18.{{cite book}}: CS1 maint: location missing publisher (link)