Games like 4 Civilizations
Games like 4 Civilizations include Manor Lords, Against the Storm, Workers & Resources: Soviet Republic, Prison Architect, and Farthest Frontier. We matched them by the tags players give 4 Civilizations on Steam (Simulation, Strategy, RTS, Base Building, and Building): closest matches first, and among equally close ones the better-known games.

Manor Lords
Shared: Strategy · Simulation · Base Building

Against the Storm
Shared: Simulation · Strategy · Base Building

Workers & Resources: Soviet Republic
Shared: Strategy · Simulation · Base Building

Prison Architect
Shared: Simulation · Building · Base Building

Farthest Frontier
Shared: Strategy · Building · City Builder

Planet Coaster 2
Shared: Simulation · Strategy · Building

Frostpunk
Shared: Strategy · City Builder · Building

Kingdoms and Castles
Shared: Simulation · Strategy · City Builder

Cities: Skylines
Shared: Simulation · Strategy · Building

Empires of the Undergrowth
Shared: Simulation · Strategy · Base Building

Foundation
Shared: Simulation · Strategy · City Builder

Dyson Sphere Program
Shared: Base Building · Simulation · Building

Anno 1800
Shared: Strategy · Simulation · City Builder

Age of Empires III: Definitive Edition
Shared: Strategy · RTS · Base Building

Ostriv
Shared: Strategy · Simulation · City Builder

Anno 117: Pax Romana
Shared: Strategy · Simulation · RTS

Norland
Shared: Simulation · Strategy · Base Building

Age of Empires II (Retired)
Shared: Strategy · RTS · Base Building

They Are Billions
Shared: Strategy · Base Building · RTS

Planet Coaster
Shared: Simulation · Building · Strategy

Kingdom Two Crowns
Shared: Base Building · Building · City Builder

Cities: Skylines II
Shared: Simulation · Building · City Builder

IXION
Shared: Strategy · City Builder · Simulation

Infection Free Zone
Shared: Base Building · Strategy · Simulation