71		American Conquest (Windows, 2003)
70		Victoria: An Empire Under the Sun (Windows, 2003)
56		Constructor (Windows, 2010)
54		The Settlers: Rise of Cultures (Windows, 2008)
54		Supreme Ruler 2020 (Windows, 2008)
54		Police Simulator (Windows, 2010)
53		Serf City: Life is Feudal (DOS, 1995)
53		Supreme Ruler: Cold War (Windows, 2011)
53		Constructor (DOS, 1997)
52		Parkitect (Windows, 2016)
52		Anno 1602: Creation of a New World (Windows, 1998)
51		Industry Giant II (Windows, 2002)
51		Port Royale 2 (Windows, 2004)
51		Mall Tycoon 3 (Windows, 2005)
51		Supreme Ruler 2010 (Windows, 2005)
51		Port Royale: Gold, Power and Pirates (Windows, 2003)
50		Supreme Ruler Ultimate (Windows, 2014)
50		1849 (Windows, 2014)
50		Supreme Ruler 1936 (Windows, 2014)
50		Mall Tycoon 2 (Windows, 2003)
50		Donald Trump's Real Estate Tycoon! (Windows, 2002)
50		Widelands (Windows, 2002)
50		University Tycoon: 2019 (Windows, 2018)
50		Capitalism Plus (Windows, 1997)
50		Start-Up 2000 (Windows, 2000)
50		Capitalism Plus (DOS, 1996)
50		Zoo Tycoon (Windows, 2001)
50		A-Train Construction Set (DOS, 1992)
50		Solidarność (DOS, 1991)
50		Build City (Windows, 2002)
45		Stronghold Crusader HD (Windows, 2012)
44		Stronghold Crusader Extreme (Windows, 2008)
44		Stronghold HD (Windows, 2012)
44		Sid Meier's Railroad Tycoon (DOS, 1990)
43		Transport Tycoon (DOS, 1994)
43		The Settlers II: 10th Anniversary (Windows, 2006)
43		SimCity 2000 (DOS, 1993)
42		Freight Tycoon Inc. (Windows, 2006)
42		Railroad Tycoon II (Windows, 1998)
42		Caesar III (Windows, 1998)
42		Theme Hospital (Windows, 1997)
42		Knights of Honor (Windows, 2005)
42		Tropico (Windows, 2001)
42		SimCity 4 (Windows, 2003)
42		FireFly Studios' Stronghold (Windows, 2001)
42		The Settlers II: Veni, Vidi, Vici (DOS, 1996)
42		Caesar II (DOS, 1995)
42		SimCity 3000 (Windows, 1999)
42		Zeus: Master of Olympus (Windows, 2000)
42		Pharaoh (Windows, 1999)
41		Tropico 2: Pirate Cove (Windows, 2003)
41		SimCity 3000 Unlimited (Windows, 2000)
41		The Settlers III (Windows, 1998)
41		Theme Hospital (DOS, 1997)
41		Emperor: Rise of the Middle Kingdom (Windows, 2002)
41		FireFly Studios' Stronghold Crusader (Windows, 2002)
41		FireFly Studios' Stronghold 2 Deluxe (Windows, 2005)
40		Caesar (Windows, 2017)
40		Pizza Tycoon (DOS, 1994)
40		Chris Sawyer's Locomotion (Windows, 2004)
40		Fast Food Tycoon 2 (Windows, 2001)
40		Fast Food Tycoon (Windows, 2000)
40		SimCity 2000 (Windows, 1996)
40		FireFly Studios' Stronghold Deluxe (Windows, 2002)
40		OpenTTD (Windows, 2004)
40		Caesar (DOS, 1993)
40		The Few (Windows, 2014)
40		Caesar II (Windows, 1996)
40		Pizza Tycoon (Windows, 2017)

Notes: Games similar to Unknown Horizons, Games like Unknown Horizons, Windows, Simulation, Strategy, Tactics, Managerial, Business Simulation, Real-Time, Top-down, Isometric, PC, Game Similarities.