[1] While interest in the area as a potentially useful port grew from the mid-19th century, it was only with the opening of the railway station to Stockholm in 1901 that Nynäshamn started to develop.

During the early 20th Century, Nynäshamn also became well known as a spa town, though most such facilities were closed down before the end of World War I.

Main industries arrived through Telegrafverkets verkstäder (the factories of the Government owned telephone company) in 1916[3] and an oil refinery built in 1928-29 by Axel Ax:son Johnson & Co.

[5] Nynäshamn, which lies about 60 km south of Stockholm, is well known for being one of the places on the Swedish mainland from where ferries to the island Gotland depart.

A library and one screen cinema is centrally located, and a limited amount of shops catering to mainly to local trade.