|o Total||1,300.83 km2 (502.25 sq mi)|
|o Land||358.76 km2 (138.52 sq mi)|
|o Water||942.07 km2 (363.74 sq mi)|
|Area as of 1 January 2014.|
(31 December 2019)
|o Density||22/km2 (57/sq mi)|
|Time zone||UTC+1 (CET)|
|ISO 3166 code||SE|
|Density is calculated using land area only.|
In 1974 the former City of Nynäshamn (itself instituted in 1946) was merged with Ösmo, from which it had been detached as a market town (köping) in 1911 and Sorunda, all in the Södertörn peninsula and adjacent islands.
Source: SCB - Folkmängd efter region och år.
On the 31st of December 2017 the number of people with a foreign background (persons born outside of Sweden or with two parents born outside of Sweden) was 6 082, or 21.64% of the population (28 109 on the 31st of December 2017). On the 31st of December 2002 the number of residents with a foreign background was (per the same definition) 3 178, or 12.96% of the population (24 528 on the 31st of December 2002). On 31 December 2017 there were 28 109 residents in Nynäshamn, of which 4 849 people (17.25%) were born in a country other than Sweden. Divided by country in the table below - the Nordic countries as well as the 12 most common countries of birth outside of Sweden for Swedish residents have been included, with other countries of birth bundled together by continent by Statistics Sweden.
|Country of birth|
|31 December 2017|
|3||EU: Other countries||722|
|5||Asia: Other countries||414|
|6||Africa: Other countries||302|
|7||Europe outside of the EU: other countries||216|
|15|| Yugoslavia/ Yugoslavia
SFR Yugoslavia/ Serbia and Montenegro
|20||Bosnia and Herzegovina||69|
|26||Unknown country of birth||3|
As all municipalities in Stockholm County Nynäshamn is served by the public transport system operated by SL. There are a number of stations of Stockholm commuter rail as well as a bus network in the municipality.
There are over 1,800 islands and islets in the municipality. The Draget Canal allows boats to traverse the municipality from west to east without needing to pass offshore of the Landsort peninsular. Nynäshamn boasts sandy beaches, areas suitable for long walks, for riding horses and for bicycling, all popular activities. The municipality may have one of the most varying natures in the county, as it allows both activities related to the Stockholm archipelago, such as boat tours, as well as boggy grounds, agricultural areas, urban areas and even forests with elk and deer.
Its history is traced several thousands of years back. About 50 historical remains are considered notable enough to be marked on maps and attract visitors. They include both grave fields from the Iron Age, runestones from the Viking Age as well as newer curiosities such as 18th century farms and cottages.