| Latin name | Vernacular name (AACR2 form) | Country code |
|---|---|---|
| Marcobraitae* | Marktbreit (Germany) | sp |
| Madridii* | Madrid (Spain) | sp |
| Magdaeburgi see Magdeburgi |
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| Magdeburgi* | Magdeburg (Germany) | gw |
| Magonae* | Mahón (Spain) | sp |
| Magone see Magonae |
||
| Magontiaci see Moguntiae |
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| Maguncia see Moguntiae |
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| 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 |
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| Marburgi see Marpurgi |
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| Marburgi-Cattorum see Marpurgi |
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| Marpurgi* | Marburg (Germany) | gw |
| Marpurgi Cattorum see Marpurgi |
||
| Marpurgi Hessorum see Marpurgi |
||
| Matisconae* | Mâcon (France) | fr |
| Matiscone see Matisconae |
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| Matriti see Madridii |
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| 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 |
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| Middelburgi see Medioburgi |
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| Middelburgi Zelandiae see Medioburgi |
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| Mirandulae* | Mirandola (Italy) | it |
| Misenae* | Meissen (Saxony, Germany) | gw |
| Miseni see Misenae |
||
| Mitauiae* | Jelgava (Latvia) | lv |
| Modona see Mutinae |
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| Moeno-Francofurtensis see Francofurti ad Moenum |
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| Moeno-Francofurti see Francofurti ad Moenum |
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| Moguntiaci see Moguntiae |
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| Moguntiae* | Mainz (Rhineland-Palatinate, Germany) | gw |
| Moguntiam see Moguntiae |
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| Moguntias see Moguntiae |
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| Moguntina see Moguntiae |
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| Moguntini see Moguntiae |
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| Monacensis see Monachii |
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| 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 |
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| 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 |