Wales
M
- Mably, Cefn
- Machen
- Machen, Lower
- Machroes
- Machynlleth
- Machynys
- Madoc, Plas
- Madoc, Weston
- Maelienyd
- Maen-Addwyn
- Maen-Offeren
- Maen-y-bardd
- Maen-y-groes
- Maenaddwyn
- Maenan
- Maenclochog
- Maendy, Wales
- Maendy, Vale of Glamorgan
- Maengwynedd
- Maenlle-gwaun
- Maenllegwaun
- Maenofferen
- Maenorbyr
- Maentwrog
- Maerdy, Wales
- Maerdy, Rhondda Cynon Taf
- Maes Ilyn
- Maes Maelor
- Maes Pennant
- Maes-bangor
- Maes-Glas
- Maes-Gwyn
- Maes-y-bont
- Maes-y-crugiau
- Maes-y-dre, Flintshire
- Maes-y-Dre, Wales
- Maes-y-Groes
- Maes-y-gwernen
- Maes-y-waen
- Maesgeirchen
- Maesglase
- Maeshafn
- Maesincla
- Maesllyn
- Maesmawr
- Maesmynis
- Maesogwen
- Maesteg
- Maestir
- Maestregymer
- Maesybont
- Maesycoed
- Maesycrugiau
- Maesycwmmer
- Maesyfed
- Maesygwartha
- Maesymeillion
- Maesyrhandir
- Magor
- Magwyr
- Maiden Wells
- Main
- Maindee
- Maindy
- Malldraeth
- Mallwyd
- Malpas, Newport
- Mamhilad
- Manafon
- Mancot
- Mancot Royal
- Mancot, Big
- Mancot, Little
- Manmoel
- Manod
- Manorbier
- Manorbier Newton
- Manordeilo
- Manorside
- Mansefield
- Manselfield
- Manselton
- Manson
- Marble Hall
- Marchwiel
- Marcroes
- Marcross
- Mardy, Wales
- Marford, Wrexham
- Margam
- Marian
- Marian Cwm
- Marian-glas
- Marian-y-de
- Marian-y-mor
- Marianglas
- Marine, Jersey
- Markham
- Marl
- Marli
- Marli, Groesffordd
- Marloes
- Marros
- Marsh, The, Pembrokeshire
- Marsh, The, Powys
- Marshes
- Marshfield, Wales
- Martin's Haven
- Martletwy
- Maryland, Monmouthshire
- Mascle Bridge
- Mathern
- Mathrafal
- Mathri
- Mathry
- Mathry Road
- Maudlam
- Mawdlam
- Mawr, Buarth
- Mawr, Nant
- May Hill, Monmouthshire
- Mayals
- Mayhill
- Maypole, Monmouthshire
- Mechell, Mynydd
- Medwaledd
- Meidrim
- Meifod
- Meinciau
- Meinir
- Meiros
- Meisgyn
- Meliden
- Melin Court
- Melin Griffith
- Melin-y-coed
- Melin-y-Ddol
- Melin-y-Graig
- Melin-y-Grogue
- Melin-y-grug
- Melin-y-Wig
- Melin-y-wig (Cynfal)
- Melinau
- Melinbyrhedyn
- Melincourt
- Melincryddan
- Mellington
- Melverley
- Melverley Green
- Melyn Close
- Menai Bridge
- Mendalgief Road
- Meriadog, Cefn
- Merlin's Bridge
- Merlin's Cross
- Merrion
- Merry Green
- Merthyr
- Merthyr Cynog
- Merthyr Dovan
- Merthyr Dyfan
- Merthyr Mawr
- Merthyr Tudful
- Merthyr Tydfil
- Merthyr Vale
- Merthyr-Tewdrig
- Mesur-y-dorth
- Meyrick, Pentre
- Michaelchurch on Arrow
- Michaelston super Ely
- Michaelston-le-Pit
- Michaelston-y-Fedw
- Middle Coedcae
- Middle Hendre
- Middle Hill
- Middle Mill
- Middleton (Shropshire), Wales
- Middleton (Swansea)
- Milebrook
- Milford, Powys
- Milford Haven
- Mill Bank Road
- Mill Common, Monmouthshire
- Mill Hill, Forest of Dean
- Millbrook, Powys
- Millin Cross
- Mills, New, Powys
- Milo
- Milton, Pembrokeshire
- Milton, Powys
- Milwr
- Min-Gwern
- Minera
- Minffordd, Wales
- Minffordd, Gwynedd
- Minllyn
- Minwear
- Miskin, Wales
- Miskin, Rhondda Cynon Taf
- Mitchel Troy
- Mitcheltroy Common
- Mochdre, Wales
- Mochdre, Powys
- Mochras (Shell Isalnd)
- Modrydd
- Moel Cae'r Ceiliog
- Moel Ddolwen
- Moel Ffagnallt Farm
- Moel Tryfan
- Moel y Garth
- Moel Ystradau
- Moel-y-crio
- Moel-y-don
- Moel-y-Main
- Moelfre, Wales
- Moelfre, Powys
- Moelfre City
- Moelfryn
- Moity
- Mold
- Mold Junction
- Mona
- Monachty
- Monaughty Poeth
- Monknash
- Monkton, Pembrokeshire
- Monmouth
- Monmouth Cap
- Monnow, Over
- Montgomery
- Moor, Wales
- Moor, The, Flintshire
- Moore Town
- More
- Morfa, Wales
- Morfa, Carmarthenshire
- Morfa, Gwynedd
- Morfa, Neath Port Talbot
- Morfa Borth
- Morfa Glas
- Morfa Nefyn
- Morfabach
- Morfydd
- Morgan Town
- Morgan, Coed
- Morganstown
- Moriah
- Mork
- Morlais Castle
- Mornington Meadows
- Morris, Castle
- Morriston
- Morristown
- Moss, Wrexham
- Mostyn
- Mostyn Quay
- Moulton, Vale of Glamorgan
- Mount Pleasant, Caerphilly
- Mount Pleasant, Conwy
- Mount Pleasant, Flintshire
- Mount Pleasant, Merthyr Tydfil
- Mount Pleasant, Neath Port Talbot
- Mount Pleasant, Pembrokeshire
- Mount Pleasant, Rhondda Cynon Taf
- Mount Pleasant, Swansea
- Mount Pleasant, Torfaen
- Mount Sion
- Mountain Air
- Mountain Ash
- Mountain Gernos
- Mountain Hare
- Mountain Water
- Mountain, Little, Wales
- Mountain, Little, Wrexham
- Mounton, Wales
- Mounton, Pembrokeshire
- Moydog
- Mule, Glan
- Mullock
- Mullock Bridge
- Mumbles
- Mumbles Hill
- Mumbles, The
- Mur-moch
- Murch
- Murton, Swansea
- Muscle Bridge
- Musselwick
- Mwyndy
- Myddfai
- Myddleton Park
- Mydroilyn
- Mynach, Cwmfelin
- Mynach, Ystrad
- Mynachdy
- Mynachlog-ddu
- Mynaughty Poeth
- Myndtown
- Mynydd Bodafon
- Mynydd Bychan
- Mynydd Cadle
- Mynydd Carn-y-cefn
- Mynydd Cerrig
- Mynydd Cilan
- Mynydd Isa
- Mynydd Llandegai
- Mynydd Mawr, Llanarmon
- Mynydd Mechell
- Mynydd Mynytho
- Mynydd Nefyn
- Mynydd Newydd
- Mynydd Pemy-bre
- Mynydd Y Fflint
- Mynydd y Gareg
- Mynydd-bach, Carmarthenshire
- Mynydd-Bach, Wales
- Mynydd-Bach, Swansea
- Mynydd-bach-Cwrt-Henry
- Mynydd-Bach-y-Glo
- Mynydd-Dwlan
- Mynydd-Garn-Lwyd
- Mynydd-llan
- Mynydd-mawr
- Mynydd-y-briw
- Mynyddcynffig
- Mynyddislwyn
- Mynytho
- Mynytho, Mynydd