Place of work — where someone is employed; the workplace or employer's location.
新しい勤め先が決まって来月から転職する予定だ。
I've found a new place of work and plan to change jobs starting next month.
勤め先の住所を教えてください。
Please tell me the address of your workplace.
彼は勤め先で長年信頼されている。
He has been trusted at his workplace for many years.