K
- Kiribati
- Kitson
- Klaatu (Planet)
- Klang
- Klarr
- Klendathu
- Klyntar (Planet)
- Knowhere
- Korbin
- Korea
- Korea, North
- Korea, South
- Korin Tower
- Korm Prime
- Koth (Hyboria)
- Krakoa
- Krauncha
- Kravia
- Kree-Lar
- Kree-Pama
- Krelar
- Krios
- Kritnah
- Krylor
- Krypton
- Kryptonopolis
- Ksavia
- Kuanga
- Kuat
- Kurrumburra
- Kush
- Kuwait
- Kvch
- Kyln
- Kymellia (Planet)
- Kymellia II
- Kymer
- Kyoto
- Kyrgyzstan
L
- Labworld
- Labyrinth
- LaGuardia Airport
- Lakani
- Lake-town
- Land Of Couldn't-Be-Shouldn't-Be
- Land Of Dawn
- Land of the Unliving
- Lanz Carpo
- Laos
- Las Vegas
- Latveria
- Latverian Embassy
- Latverian Lunar Embassy
- Latvia
- Laxidazia
- Leapfrog
- Lebanon
- Ledgerdomain
- Legerdomain
- Lesotho
- Levia
- Leviathan Base Long Winter
- Lexcorp Building
- Liberia
- Library Of Limbo
- Libya
- Lichtenbad
- Liddleville
- Liechtenstein
- Lighthouse
- Lighthouse (Space Station)
- Ligra
- Limbo
- Limbo Town
- Lithuania
- Little Spring
- Liverpool
- Lomora
- London
- London Heathrow Airport
- Long Island
- Loo Loo Land
- Loomworld
- Los Angeles
- Los Angeles International Airport
- Lost Library Of Cagliostro
- Lothal
- Lothlórien
- Lotiara
- Louisiana
- Lumin
- Luphom
- Lurvan
- Lux
- Luxembourg
M
- M Canum Venaticorum
- Macedonia
- Madagascar
- Madripoor
- Magneto's Citadel
- Maine
- Maison Alpha
- Majesdane
- Makhelastan
- Maklu
- Makray
- Malachor
- Malawi
- Malaysia
- Maldives
- Mali
- Malibu House
- Malta
- Manaan
- Manchester, Alabama
- Mand
- Mandalore
- Manhattan
- Manila
- Mansion Alpha
- Marine Vivarium
- Markovia
- Marman
- Mars
- Marshall Islands
- Marvan
- Maryland
- Massachusetts
- Masyaf
- Matriculon
- Mauritania
- Mauritius
- Maveth
- Mazikhandar
- Mbangawi
- McMurdo City
- MechaGodzilla City
- Medicus One
- Medisuela
- Mega-City One
- Mekka
- Melbourne
- Men Of Letters Bunker
- Mercury
- Metropolis
- Metropolis International Airport
- Mexico
- Miami
- Michigan
- Micronesia
- Microverse
- Middle Earth
- Midgard
- Midway City
- Milky Way
- Mimas
- Mimban
- Minas Morgul
- Minas Tirith
- Miniverse
- Minnesota
- Mirkwood
- Mirpet
- Mirror World
- Mississippi
- Missouri
- Misty Mountains
- Miyagi-Do Karate
- Mobius
- Mobos
- Modora
- Mogo
- Mogo
- Mohannda
- Mojoworld
- Moldova
- Mon Cala
- Monaco
- Monarch's Interdimensional Satellite
- Monastery Of Spinjitzu
- Mongolia
- Monitor Sphere
- Monitor's Satellite
- Monster Association Headquarters
- Montana
- Montecito
- Montenegro
- Moon
- Moord
- Morag (Planet)
- Mordor
- Moria
- Morocco
- Moroder-9
- Mortis
- Morvania
- Mos Eisley
- Mos Espa
- Moscow
- Mount Charteris
- Mount Doom
- Mount Gundabad
- Mount Justice
- Mount Myōboku
- Mount Olympus
- Mozambique
- Muara
- Multiversal Nexus
- Multiverse
- Mumbai
- Munich
- Murkatesh
- Mushroom Kingdom
- Muspelheim
- Mustafar
- Mygeeto
- Mynda
- Myrra
N
- Nablus
- Naboo
- Nadua
- Nagasaki
- Namek
- Namibia
- Nanda Parbat
- Narcisson
- Naro-Atzia
- Narobia
- Nauru
- Nautikos
- Númenor
- Nebraska
- Negative Zone
- Negus system
- Nepal
- Neptune
- Netherrealm
- Nevada
- Nevarro
- Neverlab
- Neverland
- New Asgard
- New Atlantis (Atlantean Pillar)
- New Avengers Facility
- New Carthage
- New Cronus
- New Delhi
- New Domino City
- New Genesis
- New Hampshire
