| Latin name | Vernacular name (AACR2 form) | country code |
|---|---|---|
| Marcobraitae* | Marktbreit (Germany) | sp |
| Madridii* | Madrid (Spain) | sp |
| Magdaeburgi see Magdeburgi | ||
| Magdeburgi* | Magdeburg (Germany) | gw |
| Magonae* | Mahón (Spain) | sp |
| Magone see Magonae |
||
| Magontiaci see Moguntiae | ||
| Maguncia see Moguntiae | ||
| Manhemii* | Mannheim (Germany) | gw |
| Mannheimii see Manhemii | ||
| Mannhemii see Manhemii | ||
| Mantuae* | Mantua (Italy) | it |
| Mantuae Carpentanae see Madridii | ||
| Mantuae Carpentanorum see Madridii | ||
| Mantue see Mantuae | ||
| Marburgi see Marpurgi | ||
| Marburgi-Cattorum see Marpurgi | ||
| Marpurgi* | Marburg (Germany) | gw |
| Marpurgi Cattorum see Marpurgi | ||
| Marpurgi Hessorum see Marpurgi | ||
| Matisconae* | Mâcon (France) | fr |
| Matiscone see Matisconae |
||
| Matriti see Madridii | ||
| Maximae Biturigum see Biturigibus | ||
| Mechliniae* | Mechelen (Belgium) | be |
| Medioburgi* | Middelburg (Netherlands) | ne |
| Mediolani* | Milan (Italy) | it |
| Meldis* | Meaux (France) | fr |
| Messanae* | Messina (Italy) | it |
| Methymnae a Campo * | Medina del Campo (Spain) | sp |
| Metis* | Metz (France) | fr |
| Meuaniae* | Bevagna (Italy) | it |
| Mexicana ciuitate see Mexici |
||
| Mexici* | Mexico City (Mexico) | mx |
| Micro-Pragae see Pragae |
||
| Middelburgi see Medioburgi | ||
| Middelburgi Zelandiae see Medioburgi | ||
| Mirandulae* | Mirandola (Italy) | it |
| Misenae* | Meissen (Saxony, Germany) | gw |
| Miseni see Misenae | ||
| Mitauiae* | Jelgava (Latvia) | lv |
| Modona see Mutinae | ||
| Moeno-Francofurtensis see Francofurti ad Moenum |
||
| Moeno-Francofurti see Francofurti ad Moenum |
||
| Moguntiaci see Moguntiae | ||
| Moguntiae* | Mainz (Rhineland-Palatinate, Germany) | gw |
| Moguntiam see Moguntiae | ||
| Moguntias see Moguntiae | ||
| Moguntina see Moguntiae | ||
| Moguntini see Moguntiae | ||
| Monacensis see Monachii | ||
| Monachii* | Munich (Germany) | gw |
| Monaci see Monachii | ||
| Monasterii Westphaliae * | Münster in Westfalen (Germany) | gw |
| Monspelii see Monspessulanii | ||
| Monspessulanii* | Montpellier (France) | fr |
| Montalbani* | Montauban (Tarn-et-Garonne, France) | fr |
| Monteregali* | Mondovì (Italy) | it |
| Montibus* | Mons (Belgium) | be |
| Montisbelgardi see Montisbeligardi |
||
| Montisbeligardi | Montbéliard (France) | fr |
| Moronopolis | Fictitious imprint. Known location: New York (N.Y.) * | |
| Mosquae* | Moscow (Russia) | ru |
| Mulhusae* | Mühlhausen (Thuringia, Germany) | gw |
| Mutinae* | Modena (Italy) | it |
| Myrtilleti ad Nicurm see Heidelbergae |