This is the 13343rd most frequent Russian word.
мэром
The Russian word "мэром" means "mayor" in the instrumental case.
"Мэром" here is in the instrumental case, indicating the person with the role of mayor that local residents are interacting with.
Местные жители довольны мэром города.
The local residents are satisfied with the city mayor.
"Мэром" is used in this sentence to indicate the result of becoming the office holder of mayor in the instrumental case.
После выборов новый мэр стал мэром города.
After the elections, the new mayor became the city mayor.
The word "мэром" is still in instrumental case, referring to the role he possessed in the past.