This is the 634th most frequent Finnish word.
asukkaita
"Inhabitants" or "residents."
In this sentence, 'asukkaita' refers to multiple individuals who reside in the city, and it is partitive because it's quantifying an indefinite amount.
Tässä kaupungissa on paljon asukkaita.
This city has many inhabitants.
The word 'asukkaita' in this sentence signifies specific individuals among the residents, using the partitive plural to indicate the unspecified subset that has moved away.
Joitakin asukkaita oli muuttanut pois viime vuoden aikana.
Some residents had moved away over the past year.
The word 'asukkaita' is used in the partitive plural form to describe an unspecified amount of 'residents'.