Games like Rich City
Games like Rich City include ISLANDERS, Banished, Kingdom Two Crowns, Russian Life Simulator, and Planet Coaster 2. We matched them by the tags players give Rich City on Steam (Incremental, Indie, City Builder, Strategy, and 3D): closest matches first, and among equally close ones the better-known games.

ISLANDERS
Shared: City Builder · Strategy · Indie

Banished
Shared: City Builder · Strategy · Indie

Kingdom Two Crowns
Shared: City Builder · Strategy · Singleplayer

Russian Life Simulator
Shared: Incremental · Indie · Singleplayer

Planet Coaster 2
Shared: Strategy · City Builder · 3D

Foundation
Shared: City Builder · Strategy · Indie

Bills Must Be Paid
Shared: Incremental · Strategy · Indie

Frostpunk
Shared: City Builder · Strategy · Singleplayer

Berry Bury Berry
Shared: Incremental · 3D · Singleplayer

Moncage
Shared: Indie · Singleplayer · Atmospheric

Plague Inc: Evolved
Shared: Strategy · Indie · Singleplayer

This War of Mine
Shared: Strategy · Atmospheric · Singleplayer

Frostpunk 2
Shared: City Builder · Strategy · Singleplayer

Offworld Trading Company
Shared: Strategy · 3D · Atmospheric

Cities: Skylines
Shared: City Builder · Strategy · Singleplayer

Buckshot Roulette
Shared: Strategy · Indie · Singleplayer

Beholder
Shared: Strategy · Atmospheric · Singleplayer

Idle Champions of the Forgotten Realms
Shared: Incremental · Strategy · Indie

Terra Nil
Shared: Strategy · City Builder · Atmospheric

Tavern Master
Shared: Indie · Strategy · City Builder

Cookie Clicker
Shared: Incremental · Indie · Strategy

Dawn of Man
Shared: City Builder · Strategy · Indie

Endzone - A World Apart
Shared: City Builder · Strategy · Indie

Totally Accurate Battle Simulator
Shared: Strategy · Indie · Singleplayer