This is the 853rd most frequent Swedish word.
helsingborg
Helsingborg: A coastal city in southern Sweden, located in Skåne County.
In this sentence, 'Helsingborg' refers to the name of the city itself.
Helsingborg är en stad i södra Sverige.
Helsingborg is a city in southern Sweden.
Here, 'Helsingborg' is used as a proper noun indicating the place the speaker visited.
Jag besökte Helsingborg förra sommaren och tyckte det var fantastiskt.
I visited Helsingborg last summer and thought it was fantastic.
In this case, 'Helsingborg' is part of a possessive construction, 'Helsingborgs', showing ownership of the harbor.