| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Marcelo Torcuato de Alvear | city | Buenos Aires | Argentina | -34.65 | -58.50 | 55 | 1316471 |
| Mataderos | city | Buenos Aires | Argentina | -34.67 | -58.50 | 82 | 1116250 |
| Mataderosas | city | Buenos Aires | Argentina | -34.67 | -58.50 | 82 | 1116250 |
| Merayo | city | Buenos Aires | Argentina | -43.80 | -65.75 | 882 | 0 |
| Microcentro | city | Buenos Aires | Argentina | -34.60 | -58.38 | 55 | 723286 |
| Monserrat | city | Buenos Aires | Argentina | -34.62 | -58.38 | 68 | 954787 |
| Monte Castro | city | Buenos Aires | Argentina | -34.62 | -58.50 | 88 | 1418026 |
| Monte Kastras | city | Buenos Aires | Argentina | -34.62 | -58.50 | 88 | 1418026 |
| Montserrat | city | Buenos Aires | Argentina | -34.62 | -58.38 | 68 | 954787 |