Games like City States: Medieval
Games like City States: Medieval include Manor Lords, Farthest Frontier, Workers & Resources: Soviet Republic, Age of Empires III: Definitive Edition, and Age of Empires II (Retired). We matched them by the tags players give City States: Medieval on Steam (Strategy, RTS, Grand Strategy, City Builder, and Action RTS): closest matches first, and among equally close ones the better-known games.

Manor Lords
Shared: Strategy · City Builder · Grand Strategy

Farthest Frontier
Shared: Strategy · City Builder · Building

Workers & Resources: Soviet Republic
Shared: Strategy · City Builder · Grand Strategy

Age of Empires III: Definitive Edition
Shared: Strategy · RTS · City Builder

Age of Empires II (Retired)
Shared: Strategy · RTS · City Builder

Medieval Kingdom Wars
Shared: RTS · Grand Strategy · Strategy

Against the Storm
Shared: Strategy · City Builder · Grand Strategy

Stronghold: Definitive Edition
Shared: Strategy · City Builder · RTS

Europa Universalis IV
Shared: Strategy · Grand Strategy · Wargame

Age of History 3
Shared: Strategy · Grand Strategy · RTS

Empires of the Undergrowth
Shared: Strategy · City Builder · Grand Strategy

Sid Meier's Civilization VII
Shared: Strategy · Grand Strategy · City Builder

Crusader Kings III
Shared: Strategy · Grand Strategy · Medieval

Thronefall
Shared: Strategy · City Builder · Action RTS

Becastled
Shared: Strategy · City Builder · RTS

Anno 117: Pax Romana
Shared: Strategy · City Builder · RTS

Anno 1800
Shared: Strategy · City Builder · RTS

Hearts of Iron IV
Shared: Strategy · Grand Strategy · RTS

Broken Arrow
Shared: Strategy · RTS · Wargame

Sid Meier’s Civilization® VI
Shared: Strategy · Grand Strategy · City Builder

Total War: MEDIEVAL II – Definitive Edition
Shared: Strategy · Grand Strategy · RTS

Cossacks 3
Shared: Strategy · RTS · Action RTS

Foundation
Shared: Strategy · City Builder · Medieval

Stronghold Crusader HD (2012)
Shared: City Builder · Strategy · Building