Games like Kingdoms and Castles
Games like Kingdoms and Castles include Manor Lords, Prison Architect, Foundation, Against the Storm, and Banished. We matched them by the tags players give Kingdoms and Castles on Steam (City Builder, Colony Sim, Resource Management, Management, and Simulation): closest matches first, and among equally close ones the better-known games.

Manor Lords
Shared: City Builder · Strategy · Simulation

Prison Architect
Shared: Simulation · Colony Sim · City Builder

Foundation
Shared: City Builder · Simulation · Management

Against the Storm
Shared: City Builder · Simulation · Strategy

Banished
Shared: City Builder · Colony Sim · Simulation

Cities: Skylines
Shared: City Builder · Simulation · Management

Frostpunk
Shared: City Builder · Resource Management · Colony Sim

Dwarf Fortress
Shared: Colony Sim · City Builder · Simulation

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

Oxygen Not Included
Shared: Colony Sim · Resource Management · Management

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

Norland
Shared: City Builder · Colony Sim · Simulation

Farthest Frontier
Shared: City Builder · Resource Management · Strategy

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

RimWorld
Shared: Colony Sim · Management · Strategy

Ostriv
Shared: City Builder · Colony Sim · Simulation

Settlement Survival
Shared: City Builder · Colony Sim · Management

Dawn of Man
Shared: City Builder · Colony Sim · Simulation

Anno 1800
Shared: City Builder · Simulation · Strategy

Jurassic World Evolution
Shared: Management · Simulation · City Builder

Timberborn
Shared: City Builder · Colony Sim · Sandbox

Jurassic World Evolution 2
Shared: Management · Simulation · City Builder

Factorio
Shared: Resource Management · Sandbox · Base Building

Kingdoms Reborn
Shared: City Builder · Colony Sim · Management