Alphabetical listing of Places in Guanacaste
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Maicillal | city | Guanacaste | Costa Rica | 9.88 | -85.31 | 324 | 3215 |
| Mandayure | city | Guanacaste | Costa Rica | 10.03 | -85.20 | 29 | 2596 |
| Mansion | city | Guanacaste | Costa Rica | 10.10 | -85.37 | 242 | 4902 |
| Maquenal | city | Guanacaste | Costa Rica | 9.96 | -85.52 | 830 | 4917 |
| Maquencal | city | Guanacaste | Costa Rica | 9.96 | -85.52 | 830 | 4917 |
| Maquenco | city | Guanacaste | Costa Rica | 9.96 | -85.52 | 830 | 4917 |
| Maracia | city | Guanacaste | Costa Rica | 10.24 | -85.40 | 285 | 4917 |
| Maravilla | city | Guanacaste | Costa Rica | 10.02 | -85.42 | 1981 | 4915 |
| Marbella | city | Guanacaste | Costa Rica | 10.08 | -85.76 | 150 | 3104 |
| Martirio | city | Guanacaste | Costa Rica | 10.63 | -85.06 | 1807 | 5251 |
| Mata de Cana | city | Guanacaste | Costa Rica | 10.54 | -84.88 | 2053 | 2864 |
| Mata de Caña | city | Guanacaste | Costa Rica | 10.59 | -85.45 | 830 | 18378 |
| Matambu | city | Guanacaste | Costa Rica | 10.08 | -85.43 | 1669 | 4917 |
| Matambuguita | city | Guanacaste | Costa Rica | 10.08 | -85.40 | 994 | 4917 |
| Matambuguito | city | Guanacaste | Costa Rica | 10.08 | -85.40 | 994 | 4917 |
| Matambí | city | Guanacaste | Costa Rica | 10.08 | -85.43 | 1669 | 4917 |
| Matapalo | city | Guanacaste | Costa Rica | 10.36 | -85.81 | 200 | 3675 |
| Matapalo | city | Guanacaste | Costa Rica | 10.55 | -85.77 | 0 | 1649 |
| Matina | city | Guanacaste | Costa Rica | 10.08 | -85.37 | 318 | 4883 |
| Mercedes | city | Guanacaste | Costa Rica | 9.99 | -85.37 | 1669 | 4293 |
| Mesas | city | Guanacaste | Costa Rica | 10.21 | -84.91 | 879 | 4597 |
| Mesas | city | Guanacaste | Costa Rica | 11.02 | -85.63 | 830 | 1897 |
| Millal | city | Guanacaste | Costa Rica | 9.84 | -85.26 | 830 | 2989 |
| Miramar | city | Guanacaste | Costa Rica | 9.95 | -85.50 | 830 | 4917 |
| Mojica | city | Guanacaste | Costa Rica | 10.41 | -85.20 | 68 | 3022 |
| Mojones | city | Guanacaste | Costa Rica | 11.08 | -85.70 | 0 | 1728 |
| Montanita | city | Guanacaste | Costa Rica | 10.60 | -85.40 | 830 | 16469 |
| Montano | city | Guanacaste | Costa Rica | 10.53 | -85.19 | 232 | 2490 |
| Montaña | city | Guanacaste | Costa Rica | 10.21 | -85.70 | 1669 | 4470 |
| Monte Alto | city | Guanacaste | Costa Rica | 10.07 | -85.28 | 209 | 3685 |
| Monte Galan | city | Guanacaste | Costa Rica | 10.60 | -85.60 | 141 | 3190 |
| Monte Galán | city | Guanacaste | Costa Rica | 10.13 | -85.38 | 918 | 4917 |
| Monte Romo | city | Guanacaste | Costa Rica | 10.00 | -85.38 | 2509 | 4467 |
| Montecristo | city | Guanacaste | Costa Rica | 10.55 | -85.00 | 2509 | 5316 |
| Montenegro | city | Guanacaste | Costa Rica | 10.47 | -85.21 | 150 | 1876 |
| Monteverde | city | Guanacaste | Costa Rica | 10.59 | -85.29 | 341 | 1639 |
| Mora | city | Guanacaste | Costa Rica | 9.88 | -85.42 | 393 | 2970 |
| Moracia | city | Guanacaste | Costa Rica | 10.24 | -85.40 | 285 | 4917 |
| Moralito | city | Guanacaste | Costa Rica | 10.39 | -85.51 | 62 | 5851 |
| Morote | city | Guanacaste | Costa Rica | 10.07 | -85.27 | 219 | 3474 |
| Murciélago | city | Guanacaste | Costa Rica | 10.90 | -85.73 | 830 | 1713 |
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