This is the 2596th most frequent Polish word.
tarnowie
"Tarnowie" is the locative plural form of "Tarnów," referring to places or people from Tarnów, a city in Poland.
In this sentence, "Tarnowie" is the locative case of "Tarnów," a city in Poland, used here to indicate the location of an event.
Byłem w Tarnowie zeszłego lata.
I was in Tarnów last summer.
Here, "Tarnowie" is again in the locative case, describing the location where the subject resides.
Mieszkam w Tarnowie od pięciu lat.
I have been living in Tarnów for five years.
In this context, "Tarnowie" locates where the old town being described is situated.