Locations
- Maam
- Maamgowna
- Mabbot Lane
- Mabel Street
- Madden's Cottages
- Maddenstown
- Madison Road
- Madison Terrace
- Madoc Street
- Magazine Fort
- Magazine Road
- Magennis Place
- Maida Hill
- Maida Vale
- Main Street
- Malachi Road
- Malahide
- Malahide Road
- Maldon
- Mallow
- Mallow Street Upper
- Malone Avenue
- Malpas Street
- Manchester
- Mankit Street
- Manor Place
- Manor Street
- Manorhamilton
- Mansfield
- Mansion House
- Mantlehill
- Mapperley Park
- Marchmont Street
- Margaret Place
- Marguerite Road
- Marino Crescent
- Marino Park
- Mark Lane Station
- Mark Street
- Market Square
- Market Street
- Marlborough Barracks [McKee Barracks]
- Marlborough Place
- Marlborough Road
- Marlborough Street
- Marlow
- Marrowbone Lane
- Marshalstown
- Martello Terrace
- Mary Street
- Mary Street Little
- Mary's Abbey
- Mary's Lane
- Maryborough [Portlaoise]
- Maryland
- Maxwell Road
- Maxwelltown
- May Lane
- May Street
- Mayfield Road
- Maynooth
- Mayo
- Mayor Street Lower
- McClean's Lane
- McMahon Street
- Mead's Cottages
- Meadvale Road
- Meath
- Meath Street
- Mecklenburgh Lane
- Melrose Avenue
- Menton Hall Road
- Mercer Street
- Merchant's Cottages
- Merchant's Quay
- Merlin Park
- Merrion
- Merrion Avenue
- Merrion Road
- Merrion Row
- Merrion Square
- Merrion Square South
- Merrion Strand
- Merrion Street Lower
- Merrion Street Upper
- Merrion View Avenue
- Merville Avenue
- Mespil Road
- Metropolitan Buildings
- Middle Wallop
- Middlesborough
- Middlesex
- Middleton Row
- Middleton Street
- Midland Place
- Mile End Road
- Mill Hall
- Mill Hill
- Mill Street
- Millmount Avenue
- Millmount Terrace
- Millstreet
- Milltown
- Milltown Road
- Minories
- Mistley
- Moate
- Moland Place
- Molesworth Street
- Molyneux Park
- Monaghan
- Monamolin
- Monasterevin
- Monck Place
- Monk Street
- Monkstown
- Mont Alto
- Montague Street
- Montpelier Hill
- Monument Street
- Moone
- Moore Lane
- Moore Place
- Moore Street
- Moorgate Street
- Moortown
- Morehampton Road
- Morehampton Terrace
- Morgan Place
- Morgans Lane
- Mornington
- Mornington Road
- Morristown
- Moss Street
- Motcombe Road
- Mounjoy Street
- Mount Brown
- Mount Eden Road
- Mount Pleasant
- Mount Royal
- Mount Seville Terrace
- Mount Street
- Mount Street Crescent
- Mount Street Lower
- Mount Street Upper
- Mount Talbot
- Mount Tallant Avenue
- Mount Temple
- Mountain View
- Mountain View Avenue
- Mountain View Road
- Mountcormac
- Mountjoy Cottages
- Mountjoy Parade
- Mountjoy Place
- Mountjoy Square
- Mountjoy Street
- Mountmellick
- Mountnugent
- Mountpleasant
- Mountpleasant Avenue Lower
- Mountpleasant Avenue Upper
- Mountpleasant Parade
- Mountpleasant Square
- Mountpleasant Terrace
- Mountpleasant Villas
- Mountrath
- Mountshannon Road
- Moy Elta Road
- Moydorough Abbey
- Moynalty
- Moyne
- Moyne Road
- Moyode
- Moyode Castle
- Moyvore
- Mullagh
- Mullaghmore
- Mullinahone
- Mullingar
- Munster Street
- Munster Terrace
- Murtagh Road
- Musgrave Road
- Muswell Avenue
- Muswell Hill
- Muswell Hill North
- Myatts Park
- Myshall