Here are some of the more common ones:
The nucleus would be like city hall, where all the important decisions get made, where the blueprint for the cell is contained.
The mitochondria would be like the power plants of a town that supply energy. In plant cells, the chloroplast would provide this resource.
The vacuole would be represented by storage units, they are used to store water and wastes.
The ribosomes would be the construction department, in charge of building new structures for the city.
The lysosomes would be represented by the sanitation department (trash collection), in charge of disposing of all trash and wastes.
The cell membrane would be the gate-keeper/security department, in charge of who could come into the cell and who could leave.
The cytoplasm would be represented by mass transit department, in charge of getting everyone where they needed to go within the city.