| Graphic | City Improvement | Requires | Effect |
 | Airport Cost: 160 | Flight | Produces veteran air units, trading hub |
 | Aqueduct Cost: 100 Upkeep: 1 | Construction | Allows population growth past size 6, for cities with no access to fresh water |
 | Bank Cost: 160 | Banking | 50% increase to the city’s tax revenue |
 | Barracks Cost: 40 Upkeep: 1 | — | Produces veteran ground units, allows ground unit upgrade, and heals ground units in 1 turn |
 | Cathedral Cost: 160 | Monotheism | Requires temple, makes 3 unhappy citizens content |
 | City Walls Cost: 20 Upkeep: 0 | Masonry | Provides a land bombardment defense of 8, and +50% to defensive bonus against land attacks, not needed past size 6 |
 | Coal Plant Cost: 160 | Industrialization, Coal | Increases factory output by 50%, causes pollution |
 | Coastal Fortress Cost: 40 Upkeep: 0 | Metallurgy, Iron, Saltpeter | Provides a naval bombardment defense of 8, +50% against naval attacks, and automatically bombards passing enemy ships |
 | Colosseum Cost: 120 | Construction | Makes 2 unhappy citizens content |
 | Courthouse Cost: 80 Upkeep: 1 | Code of Laws | Reduces corruption, reduces effect of propaganda against the city |
 | Factory Cost: 240 | Industrialization, Iron | 50% increase to production, causes pollution |
 | Granary Cost: 60 upkeep: 1 | Pottery | Halves food storage required for population growth |
 | Harbor Cost: 80 | Map Making | +1 food from coast, sea and ocean squares, produces veteran sea units, trading hub, and upgrades sea units |
 | Hospital Cost: 160 Upkeep: 2 | Sanitation | Allows population growth past size 12 |
 | Hydro Plant Cost: 240 | Electronics | Increases factory output by 50%, requires a river, makes no pollution |
 | Library Cost: 80 Upkeep: 1 | Literature | 50% increase to the city’s science output |
 | Manufacturing Plant Cost: 320 | Robotics | 50% increase to production, causes pollution |
 | Marketplace Cost: 100 Upkeep: 1 | Currency | 50% increase to tax revenue, increases effect of luxury resources |
 | Mass Transit Cost: 200 | Ecology, Rubber | Reduces pollution from population |
 | Nuclear Plant Cost: 240 Upkeep: 3 | Nuclear Power, Uranium | Increases factory output by 100%, produces no pollution, requires fresh water, chance of meltdown |
 | Offshore Platform Cost: 240 | Miniaturization | +1 shield from coast, sea and ocean squares |
 | Palace Cost: 100 Upkeep: 0 | Masonry | Acts as center of your empire, eliminates corruption/waste in the capital and reduces it in nearby cities |
 | Police Station Cost: 160 | Communism | Reduces war weariness, reduces corruption |
 | Recycling Plant Cost: 200 Upkeep: 2 | Recycling | Reduces pollution caused by city improvements |
 | Research Lab Cost: 200 | Computers | 50% increase to science output |
 | SAM Missile Battery Cost: 80 Upkeep: 2 | Rocketry, Aluminum | Defends against air bombardment |
 | Solar Plant Cost: 320 | Ecology | Increases factory output by 50%, makes no pollution |
 | Temple Cost: 60 Upkeep: 1 | Ceremonial Burial | Makes 1 unhappy citizen content |
 | University Cost: 200 | Education | 50% increase to science output |
Related Links:
- Info about city management are available in the Civilization III Info Center.