Two things called rank
BuildCity uses the word rank for two different things, and players mix them up constantly. The public leaderboard ranks cities against each other by population; the city rank guide is about climbing that list. This article is about the other one: the city rank ladder, a fixed set of six population milestones that every city climbs on its own. Reaching a milestone does not depend on anyone else's city. It changes what you are allowed to build.
The ladder is the game's main progression gate. Roads, utilities, trade, industry, tourism, the social features, and the City Hall departments all unlock at specific rungs, which means the first thousand residents of a city are less about income and more about opening doors. Knowing exactly where each door is lets you plan a first city instead of discovering it one locked button at a time.
The six ranks
| Rank | Population | What it opens |
|---|---|---|
| Town | 0 | Two-lane roads, zoning, basic utilities, small fire and police stations, the local hospital, playgrounds and small parks. |
| Small City | 500 | Four-lane roads, City Hall, schools, library, school bus stops, parks and amenities (temples, church, gas station, parking), coal and oil power plants, mines and oil wells, Trade Depot, Trade Center, Trade Port, Freight Station, Tourism Bureau, sister cities. |
| City | 1,000 | Smelter, Oil Refinery, the insurance company, and a second City Hall level. |
| Big City | 3,000 | Third City Hall level and department. |
| Metropolis | 10,000 | Fourth City Hall level and department. |
| Megacity | 20,000 | Fifth City Hall level and department; the highest rank currently in the game. |
Two things stand out in that table. First, almost everything unlocks at 500. The jump from Town to Small City is by far the largest expansion of the toolbox in the game, which is why the How to Play guide spends so much time on getting a first district to settle: those first 500 residents are the price of admission to trade, industry, education, and tourism all at once. Second, the ranks above 1,000 do not add new building types directly. They add City Hall levels, and it is the departments inside City Hall that carry the late-game unlocks.
The in-game milestone panel shows your current rank, the population needed for the next one, and the unlock list for it. Rank is evaluated from current population, not peak population, so a city that shrinks after a disaster or a bad budget can lose eligibility for the next City Hall level until it recovers. Buildings you already placed keep working; only new placements are gated.
City Hall and the department choice
City Hall itself unlocks at Small City. Once built, it can be upgraded one level at a time, and its maximum level is always your current rank index: level 1 at Small City, level 2 at City, up to level 5 at Megacity. Each level adds one department slot, and each slot holds one department add-on attached to the building. There are five departments and five possible levels, so a Megacity can eventually run all of them, but a City at 1,000 residents has to choose two, and the order of that choice shapes the next several thousand residents.
| Department | City-wide effect | Building it unlocks |
|---|---|---|
| Fire Department | Two extra fire trucks, response +20%, extinguishing +30% | Large Fire Station |
| Police Department | Two extra patrol cars, crime -30%, jail capacity +50% | Large Police Station |
| Education Department | School range +30%, land value +20%, commerce +15% | University |
| Health Department | Hospital range +30%, happiness +10, disease prevention | Large Hospital |
| Transportation Department | Expands transport infrastructure for citizens and visitors | Train Station and Ferry Terminal |
Notice that the large versions of the three emergency services are department-gated rather than rank-gated. You can reach Metropolis without ever building a Large Hospital if you never chose Health. That is deliberate: the departments are how a city specializes. A dense residential city tends to take Education first for the land value multiplier and the University, then Health for the happiness bonus. A city built around a casino district takes Police early. A tourism city wants Transportation for the train station, because visitors who arrive by rail do not compete with your road entrance.
Progression ladders inside the ranks
Rank is the outer gate, but several buildings carry their own inner ladders that only start once the building exists.
- Trade Center levels unlock logistics: the base center enables player-to-player trade, the first upgrade unlocks the Freight Station, and the second unlocks the Trade Port. See the resource chains article.
- Tourism Bureau levels one through ten unlock the tourism buildings in sequence as tourism income accumulates.
- Casino Association levels gate the casino tiers: installed, then Hotel Casino, then Luxury Casino, driven by casino revenue. See the tourism article.
- Sister cities open at Small City and then progress through five bond levels of their own.
This layering is why two cities at the same rank can feel very different. Rank says what you may start; the inner ladders say how far you have taken it.
Population milestones elsewhere
The same population numbers echo through other systems. Achievements pay gems at 50, 200, 500, 1,000, and 5,000 residents, measured against the best of all your cities, so a second city never costs you progress on the first. The daily quest set always includes a population target of plus 100 for the day. And the public leaderboard, the other rank, sorts by population too. Everything that rewards growth in BuildCity points at the same number, which is the reason the leaderboard guide and this article give the same advice from opposite directions: remove the bottleneck that is capping population, and every other system moves.
A route through the ladder
- Town to Small City (0 to 500). One compact road spine, power, water, sewage, a small fire and police station, a playground or park, and enough residential zoning to fill them. Do not spread out; density within coverage is what gets you to 500 fastest.
- At 500. Build City Hall and take your first department. Place the high school. If the map has deposits near your edge, add a Trade Depot and a mine so the Small City economy starts paying for itself.
- Small City to City (500 to 1,000). Upgrade the main corridor to four lanes, add the local hospital, and open the Tourism Bureau if the map entrance road is clean. Pair with a sister city.
- At 1,000. Second department. Smelter or refinery if your mines are running. This is also where the tax curve starts to matter, because level 2 housing appears in numbers.
- City to Big City to Metropolis (1,000 to 10,000). Each rank is one more department. Growth here is a land value and education problem, not an unlock problem; the land value article covers the numbers.
- Megacity (20,000). The fifth department completes City Hall. From here the game is about the late-game economy and the specialized ladders rather than rank.
If you want to check a specific building, the buildings reference lists footprint, cost, and upkeep for everything in the table above.