Growth Districts - Fishery, Butchers' Quarter, Millers' Quarter - these districts create a large amount of food based off of adjacent sea resources, pastures, and farms respectively.

Infrastructure Districts - Masons' Quarter, Smiths' Quarter, Forestry Quarter - these districts create production based off of adjacent quarries, mines, and lumbermills. They also create housing for your empire.

Luxury Districts - Cantina Quarter, Culinary Quarter, Textiles Quarter, Jewelers Quarter - these districts enhance a class of luxury resources thematic to the district. They also provide a maximum of +1 additional trade route to a city.

Government Center - this district gets bonuses based on your current government type, and generates a variety of yields.

Medical Center - this modern district adds housing and growth to all cities in your empire.

Naval Base - this is like an encampment that gets built in coastal tiles.

Boardwalk - this is a district for culture and tourism that gets built in coastal tiles.