This is the 55th most frequent Norwegian word.
byen
"The city" or "the town."
Here, 'byen' describes the domain or scope, setting the context that 'the city' is where the houses are located.
Husene i byen er ofte gamle.
The houses in the city are often old.
Here, 'byen' refers to 'the city' as a location or inhabited area.
Jeg bor i byen.
I live in the city.
In this sentence, 'byen' is used to indicate a destination, specifically 'the city'.