Read about cell organelles and their functions in your science textbook or on a reputable website. Ask your teacher if you need to research a plant cell or an animal cell, since their organelles vary. Some basic cell organelles include the plasma membrane, chromosomes, cytoplasm, the mitochondria, the nucleus, and the vacuoles.
Compare the cell's functions to the functions of city workers, businesses and structures. For example, vacuoles, which contain water, are analogous to lakes, while guards or border patrol officers, who control who exits and enters an area, are analogous to a cell's plasma membrane. If you are creating a plant cell city, the chloroplasts, which make food for plant cells, are analogous to a restaurant or chef.
Draw a city plan that includes all the required organelles. Ask your teacher if she wants you to use specific materials in creating the plan; in general, students are encouraged to use their imagination rather than adhere to a strict materials list or drawing style. Label each city structure with a name that includes a cell organelle, for example "Chloroplast Café" or "Vacuole Pond." The placement of these structures in the city plan should resemble the placement of organelles in a cell.
Mold a 3-D model based on your drawn city plan, if required. If no specific materials are required, you can use cardboard, clay, foam or building blocks to create the model.