Is Cities: Skylines co-op?

Not natively. Cities: Skylines ships single-player; the community mod Cities: Skylines Multiplayer (CSM) adds co-op — Build one city together; Cities: Skylines 1 only.

Does Cities: Skylines have PvP?

Only with the Cities: Skylines Multiplayer (CSM) mod, which is co-op only.

How many people play Cities: Skylines?

About 8,842 players were in-game when this page was built (2026-09-08).

Ready Up — what game do we play?Compare two Steam libraries →

Multiplayer games › Strategy › Builder & management

Is Cities: Skylines multiplayer? Yes — with Cities: Skylines Multiplayer (CSM)

Not out of the box — but the Cities: Skylines Multiplayer (CSM) mod makes it co-op. Cities: Skylines is a builder & management game released in 2015, 93% positive on Steam (275,770 reviews), with 8,842 playing right now. $29.99 on Steam.

Co-opSingle-player tooMultiplayer via mod: Cities: Skylines Multiplayer (CSM)Strategy · Builder & management

How to play Cities: Skylines with a friend: Cities: Skylines Multiplayer (CSM)

Build one city together; Cities: Skylines 1 only. Steam lists Cities: Skylines as single-player, so it won't show up in Steam's own "games we both own" view as something you can play together — Ready Up counts it anyway, marked "Via mod", and you can hide mod-only games with one filter if that's not your thing.

Get Cities: Skylines Multiplayer (CSM)

Cities: Skylines is a modern take on the classic city simulation. The game introduces new game play elements to realize the thrill and hardships of creating…

Steam tags: City Builder, Simulation, Building, Management, Strategy, Sandbox, Singleplayer, Moddable

Do you and a friend both own Cities: Skylines?

Ready Up compares two Steam libraries and shows every multiplayer game you both have — including whether Cities: Skylines is one of them — then helps you pick tonight's game with a weighted roll or a bracket.

Compare our libraries Steam store page

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Dungeons 3

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The Settlers: New Allies

Builder & management · 47% positive on Steam (911 reviews) · 72 playing right now

Tired of Cities: Skylines? The Swap tab finds the closest unowned games of the same type that are newer or rated higher.

Quick answers

Is Cities: Skylines co-op?: Not natively. Cities: Skylines ships single-player; the community mod Cities: Skylines Multiplayer (CSM) adds co-op — Build one city together; Cities: Skylines 1 only.
Does Cities: Skylines have PvP?: Only with the Cities: Skylines Multiplayer (CSM) mod, which is co-op only.
How many people play Cities: Skylines?: About 8,842 players were in-game when this page was built (2026-09-08).

Ready Up is a free tool: enter two Steam usernames and it lists the multiplayer games you both own, runs a bracket to pick one, and suggests new co-op games that fit how you both play. Ratings, tags and player counts from Steam and SteamSpy; updated 2026-09-08. Powered by Steam — not affiliated with or endorsed by Valve Corporation.