Right now I'm only listing non-city locations with unique names (or are home to certain characters).
SHOWS
The Transformers (1984)
Crystal City
Hive City
Beast Machines (1999)
Cybertropolis
Energon (2004)
Central City
Robots in Disguise (2015)
Doradus
Helpful City -- city on Luna 1
Doradus
Helpful City -- city on Luna 1
Nuon City [Airazor]
Pellechrome
Cyberverse (2018)
Lithium Flats
Marvel Comics
The Transformers (1984)
Helex [Momus, Swerve]
Helex [Momus, Swerve]
Iacon [Bumblebee, Chromedome, Grimlock, Orion Pax]
Ibex [Beachcomber, Photon]
Jan-Ja
Kalis / Adaptica [Banzai-Tron]
Polyhex [Whirl]
Slaughter City
Sonic Canyons [Siren]
Stanix [Ravage]
Tarn [Megatron, Shockwave]
Tyrest
Valvolux
Vos [Starscream]
Yuss [Nightbeat, Straxus]
3H Productions
The Wreckers (July 2001)
Dodecahex
Dreamwave Productions
Armada (July 2002)
Cyber City
Mini-Con Sector
The War Within (October 2002)
Cyber City
Mini-Con Sector
The War Within (October 2002)
Altihex
Helix Gardens
Kaon
Kolkular
Helix Gardens
Kaon
Kolkular
Praxus [Bluestreak, Prowl]
Protihex / Protohex [Galvatron]
Uraya [Hefter; Binary]
War Within: The Dark Ages (October 2003)
Nova Cronum [Skids]
Praetorus Wharf
Tagan Heights
Nova Cronum [Skids]
Praetorus Wharf
Tagan Heights
War Within: The Age of Wrath (September 2004)
Tyger Pax
Devil's Due Press
G.I. Joe vs. the Transformers: The Art of War (March 2006)
Capitol City
Fun Publications
Transcendent (February 2008)
Axiom Nexus
Shattered Glass (April 2008)
Torus Heights
Shattered Glass (April 2008)
Torus Heights
Reunification (February 2009)
Durax
Durax
Battle Lines (February 2011)
Plurex
Termination (2013)
Trigat
Alone Together (2014)
Damaxus
Ferromax Detention CenterIDW Publishing
Spotlight (2006)
Peptex
The Reign of Starscream (May 2008)
Simfur [Grimlock]
Trypticon
Defiance (January 2009)
Burthov
Metrotitan
Metrotitan
The Transformers (2009)
Deltaran Medical Facility
Deltaran Medical Facility
Rodion [Quark]
Foundation (February 2011)
Thetacon [Ironhide]
More than Meets the Eye (January 2012)
Alyon
Alyon
Ambustus Minor [Dominus Ambus]
Apophenia
Bitrex [Shock]
Esserlon
First City
First City
High-Ceilinged Manifold [Censere]
Iacon Minor [Tripodeca]
K'th Kinsere
Mesmerica
Mitteous Plateau
K'th Kinsere
Mesmerica
Mitteous Plateau
Monoplex [Hound]
Obex
Obex
Pescus Hex [Pipes]
Pess Pess
Pess Pess
Petrex [Prowl]
Petrohex [Rewind]
Pious Pools [Rung]
Pious Pools [Rung]
Polyhex Minor [Flatfoot]
Rivets Field [Tailgate]
Sistex [Zeta Prime]
Subterrania
Subterrania
Tesarus [Kup]
Tesarus Minor [Jhiaxus]
Tetrahex [Cyclonus]
Unitrex
Vinvissius Canals / Vinvissius Heights
Robots in Disguise (2012)
Aegiax
Darklands
Port Residua
Vespertine Blue
Aegiax
Darklands
Port Residua
Vespertine Blue
Autocracy (January 2012)
Galaxxon
Kutanzuule
Galaxxon
Kutanzuule
Nyon [Hot Rod]
Triax
Ultirex
Ultrix
Monstrosity (March 2013)
Harmonex
Beast Hunters (May 2013)
Last Spark
New Kalis
New Spark
Harmonex
Beast Hunters (May 2013)
Last Spark
New Kalis
New Spark
Sins of the Wreckers (November 2015)
Carpessa
Optimus Prime (2016)
Forgotten Plains
Forgotten Plains
Staniz [Jazz]
Lost Light (2016)
Automica
Celestica Tetracornacapria [Lug]
Eugenesis
Teledonia [Kaput]
Tesk
Vaporex [Ratchet]
Transformers vs. Visionaries (January 2018)
New Prysmos
New Prysmos
NOVELS
Hardwired (June 2003)
Centurion [Starscream]
Exodus (July 2010)
Blaster City
PROSE
Reaching the Omega Point (1999)
Corumkan
J'nwan
J'nwan
The New World (July 2007)
Ankmor Park
Gygax
Ankmor Park
Gygax
Proximax
Flames of Yesterday (May 2010)
Glibax / Gilbax
Hyperious
Median
Glibax / Gilbax
Hyperious
Median
Praxium
A Team Effort (2010)
Detrona
A Team Effort (2010)
Detrona
Zero Point (February 2012)
G'th Semane
G'th Semane
The Ultimate Guide (May 2004)
Hydrax Plateau
Collector's Edition toy bios
Mebion
Hydrax Plateau
Collector's Edition toy bios
Mebion
Transformers: The Movie Guide (July 2007)
Ky-Alexia [Rosanna]
Risk: Cybertron War Edition (2007)
Hexima State
Ky-Alexia [Rosanna]
Risk: Cybertron War Edition (2007)
Hexima State
Perihex
Collectors' Club #40
Carburisia [Leozack, Lyzack]
2012Carburisia [Leozack, Lyzack]
Games
Fall of Cybertron (2012)
Hydrax Canyons
2014Fall of Cybertron (2012)
Hydrax Canyons
Others
Botcon 2014 bios
New Polyhex
Botcon 2014 bios
New Polyhex