Cities: Skylines: Complete Guide

A practical guide to building a city that doesn't bankrupt itself or choke on traffic in the original Cities: Skylines (2015), from the first road to a 100k+ metropolis. It covers zoning, services, traffic, money, DLC, and the mods most players use.

Researched September 2026, current as of patch 1.21.1-f9 (the latest patch listed on the Paradox wiki and Steam news, released after the Race Day expansion). Live games change; check the linked sources if something differs.

Note: This guide is for the original Cities: Skylines (Steam app 255710), not Cities: Skylines II. The original still gets patches and paid content, and its mod scene on the Steam Workshop is much bigger.

Quick Start

• Pause is your best tool. Press Space and lay out roads, water, and power before time starts. Nothing costs upkeep until it's built, and a paused city grows nothing.
• Start with two-lane roads, not avenues. Big roads cost a lot in upkeep and you don't need them until traffic proves it.
• Connect to the highway properly. Build a slip road off the highway into your town. Don't hang your whole city off one intersection.
• Put water intake upstream and sewage outlets downstream. If you pump in your own sewage, sickness spreads fast. Check the water flow arrows with the water info view.
• Keep industry away from residential. Industrial pollution makes nearby residents sick and lowers land value. Leave a gap, or put offices or commercial zones between them.
• Watch the RCI demand bars (Residential, Commercial, Industrial) at the bottom and zone whatever is high. Don't zone huge blocks all at once.
• Build services only when you unlock and need them. Health, fire, police, and garbage all cost upkeep. Place them once their info view shows gaps.
• Taxes can go up a bit. Early on, residential and commercial around 10–12% is a common safe range. Watch happiness and demand after each change.
• Save often, to separate slots. Mods, DLC, and patches can break a save, and so can a bad traffic decision.
• Traffic is the endgame. Most city problems come down to vehicles not getting where they need to go. Plan your road hierarchy early (see below).

Core Systems

Milestones and unlocks

Your population unlocks milestones (Little Hamlet, Worthy Village, and so on). Each one unlocks new services, zones, policies, and extra map tiles you can buy. The base game lets you own up to 9 tiles. Mods like 81 Tiles remove that limit.

Hitting a milestone also gives you a cash bonus. Early on, it's often what keeps you out of debt.

Zoning

Zone | What it does | Tips

Low-density residential | Houses, low traffic | Good for quiet edges of town

High-density residential | Apartments, lots of workers | Needs strong transit and services

Low/high-density commercial | Shops that serve residents and sell goods | Needs deliveries from industry or imports

Industrial | Jobs, goods, heavy truck traffic | Put it near highway/rail/cargo, away from houses

Office | Jobs with no pollution | Needs educated workers. Good buffer zone

Zones only grow on cells next to roads (up to 4 cells deep). Buildings level up (1–5 for residential) with land value, services, education, and happiness. Click a building to see what's holding it back.

Utilities

• Power: Start with a coal or oil plant (cheap, polluting) or wind turbines (clean, weaker). Move to solar, fusion, or other clean power later. Power lines are needed to jump gaps between areas that aren't connected.
• Water and sewage: Pipes follow roads. You need both intake and outflow. Water treatment plants reduce the pollution from sewage.
• Heating: Only in winter maps, with Snowfall.
• Garbage: Landfills fill up. Switch to incinerators, and to recycling later with Green Cities/Industries.
• Deathcare: Build cemeteries and crematoriums early. If you skip them, bodies pile up and "dead" icons spread across your city.

Services and coverage

Each service shows its coverage in its info view (the top-left info panel). Services that use vehicles (fire, police, garbage, healthcare, deathcare) depend on roads. A hospital in a traffic jam doesn't cover anything.

Service | Why it matters

Education (elementary, high school, university) | Raises building levels and unlocks office and high-tech demand

Healthcare | Stops sick citizens from dying and abandoning buildings

Police | Crime lowers happiness

Fire | Burnt-down buildings leave rubble

Parks | Raise land value and happiness

Districts and policies

Draw districts with the district tool, then apply policies to just that area:

• Specialized industry: Forest, Farming, Ore, and Oil. Each one needs the matching natural resource (fertile land, forest, ore, or oil) under the zone. Use the Natural Resources info view to find them. Ore and oil run out over time.
• Specialized commercial: Leisure and Tourism (After Dark), Organic (Green Cities), and more.
• Useful policies: Smoke Detectors, Recycling, Free Public Transport, Heavy Traffic Ban (keeps trucks out of neighborhoods), and High-Rise Ban for keeping the low-rise look.

Each policy costs money. Check the budget impact before applying one city-wide.

Budget and taxes

• Upkeep grows with every service building. Use the budget sliders to run services below 100% when coverage is more than enough.
• Loans are fine early on. Just pay them back once income is steady.
• Income sources are taxes, tourism, public transport fares, and industry exports.

Traffic: The Real Game

Traffic AI in Cities: Skylines takes the shortest route by lane, not the smartest one. That's why you'll see everyone crammed into a single lane.

Road hierarchy rules of thumb:

• Highways connect to districts through ramps, not intersections.
• Avenues/arterials carry traffic between districts.
• Local two-lane roads only serve buildings. Don't let people use them as through-routes.
• Keep intersections well apart. Close-together junctions cause queues that back up into each other.
• Use one-way roads and roundabouts to reduce conflicting turns.
• Don't zone along highways or main arterials. Every driveway and service stop slows traffic down.
• Give industry its own highway exit or a cargo rail/harbor hub so trucks don't mix with commuters.

Public transport gets cars off the road:

Mode | Best for

Bus | Early local coverage. Cheap

Metro | High-density cores. No surface traffic

Train | Linking to outside connections and distant districts

Tram (Snowfall) | Medium-density corridors

Monorail, cable car, ferry, blimp (Mass Transit) | Specialized links

Taxis (After Dark) | Filling gaps

Use the Traffic and Public Transport info views often. Red roads and overcrowded lines are where you should work next.

City-Building Progression

Stage | Population | Focus

Opening | 0–2,000 | Roads, power, water, sewage, low-density zoning, highway connection

Early town | 2,000–10,000 | Deathcare, garbage, basic health/police/fire, first bus lines

Growing city | 10,000–40,000 | Districts, specialized industry, education, metro or train, offices

Big city | 40,000+ | Unique buildings, monuments, transit network, fixing bottlenecks

Unique buildings and monuments: Unique buildings unlock through city conditions (for example tourism or specialization targets). They boost land value, attractiveness, and tourism. Monuments need a set of unique buildings first and give large citywide bonuses.

DLC Overview

All DLC is optional. Many players pick up After Dark, Mass Transit, Parklife, Industries, and Campus first.

DLC | Adds

After Dark | Day/night cycle, leisure/tourism districts, taxis, cargo hubs

Snowfall | Winter maps, heating, trams

Natural Disasters | Disasters, emergency services, radio

Mass Transit | Monorail, cable cars, ferries, blimps, transport hubs

Green Cities | Eco services and buildings, organic commercial, self-sufficient housing

Parklife | Park areas you can design with entry gates and paths

Industries | Supply chains for farm, forest, ore, and oil. Warehouses, a post service

Campus | Designable universities, varsity sports

Sunset Harbor | Fishing industry, trolleybuses, intercity buses, transport hubs, waste transfer

Airports | Designable airports

Plazas & Promenades | Pedestrian zones, service points

Financial Districts | Banks, financial offices, the stock exchange

Hotels & Retreats | Hotels, sightseeing

Race Day | Motor racing venues, running/cycling races, parades, and Event Roads that close to traffic during events (March 10, 2026 - the most recent expansion, launched together with the Iconic Brutalism and Renewed History content creator packs)

The free patch that shipped with Race Day (1.21.1-f4) also gave every player an Employment info view (shows unfilled jobs and where unemployed cims live) and a road fence tool, with no DLC required.

Mods (Steam Workshop)

These are staples. Always check a mod's Workshop page for compatibility with the current patch. Paradox said the Race Day patch made big code changes that affected mods, so outdated mods can break loading.

• Harmony: a library that many mods depend on.
• Traffic Manager: President Edition (TM:PE): lane arrows, junction rules, priority signs, speed limits, and vehicle restrictions. The biggest single fix for traffic.
• Move It: move and align any object.
• Loading Screen Mod: faster loading and tools for finding assets you don't need.
• Network Anarchy / Node Controller-style tools: finer control over roads.
• 81 Tiles: unlocks every map tile.
• Find It!: search tool for assets.

Keep your mod list lean. Disable anything you don't need and back up saves before you subscribe to anything new.

Common Mistakes to Avoid

• Grid-spamming four-way intersections on busy roads. Use T-junctions, fewer crossings, and roundabouts.
• Zoning too much at once, which leaves you with unemployment or a labor shortage and abandoned buildings.
• Forgetting deathcare until a "death wave" hits. Citizens move in together and die around the same time, so build crematoriums before it starts.
• Sewage upstream of the water intake.
• Plopping services everywhere. Upkeep adds up. Check coverage first.
• Over-educating a city whose industry needs uneducated workers. Generic industry wants low-education workers. Offices and high-tech want educated ones.
• One highway exit for everything. It becomes the single bottleneck for commuters, tourists, and trucks.
• Subscribing to 300 Workshop items and then wondering why the game crashes after a patch.

Advanced Tips

• Use the Traffic Routes info view and click a jammed road segment or junction to see where the vehicles on it are coming from and going to.
• Check the Employment info view (free since the Race Day patch) before zoning more jobs or housing: it shows exactly which zones are short of workers.
• Pedestrian paths are powerful. Cims will walk instead of drive if paths are short, which cuts local car traffic.
• Cargo trains and harbors shift industrial trucks to the edge of the city. Place the terminal next to industry, not downtown.
• Hub stations (Mass Transit/Sunset Harbor) let lines connect cleanly. Transfers keep lines short and reliable.
• Specialized industry with the Industries DLC creates internal supply chains. That means fewer import trucks and more profit, but only if you give warehouses decent road access.
• Build your city around the terrain. Rivers and hills make natural district borders and look better than flat grids.
• Run a "no highway spaghetti" rule: separate on- and off-ramps, give weaves plenty of distance, and avoid right-hand-then-left-hand exit mixes.

FAQ

Is Cities: Skylines 1 still worth playing over Cities: Skylines II? Many players still prefer it for its huge mod and asset library and its lighter hardware needs. It still gets patches (1.21.1-f9 as of this writing).

How do I unlock all 25 tiles (or 81)? The base game lets you buy up to 9 of the 25 tiles through milestones. Use a Workshop mod such as 81 Tiles for more, and check it has been updated for the current patch.

Why are my buildings abandoned? Usually it's one of these: no workers/customers, no goods, not enough services, too much pollution or noise, or dead bodies not being collected. Click a building to see its complaint.

Why is everyone using one lane? The pathfinding picks the lane for its next turn early. Space out junctions, use lane-connector tools (TM:PE), and give traffic alternative routes.

How do I stop the death waves? Build crematoriums and cemeteries early. Zoning in smaller phases also spreads out move-in (and death) timing.

My game crashes after an update. What should I do? Unsubscribe from or disable mods, then turn them back on in small batches. Check each mod's Workshop page for patch compatibility (a lot changed with the Race Day patch).

Which DLC should I buy first? After Dark, Mass Transit, and Industries give the most gameplay. Parklife and Campus are next if you like to design custom areas.

Sources

• Cities: Skylines Wiki (Paradox): Patches
• Steam News for Cities: Skylines (Race Day launch and 1.21.1 patch notes)
• Cities: Skylines Wiki (Paradox)
• Cities: Skylines Wiki (Paradox): Race Day