| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| MRAO (AEROTORTUGUERO) | airport | Costa Rica | 10.42 | -83.61 | 82 | 0 | |
| MRBA (BUENOS AIRES) | airport | Costa Rica | 9.16 | -83.33 | 1214 | 0 | |
| MRBC (BARRA DEL COLORADO) | airport | Costa Rica | 10.77 | -83.59 | 3 | 0 | |
| MRCC (COTO 47) | airport | Costa Rica | 8.60 | -82.97 | 26 | 0 | |
| MRCH (CHACARITA) | airport | Costa Rica | 9.98 | -84.77 | 7 | 0 | |
| MRCV (CABO VELAS) | airport | Costa Rica | 10.36 | -85.85 | 33 | 0 | |
| MRDC (DUACARI 2) | airport | Costa Rica | 10.35 | -83.63 | 79 | 0 | |
| MREC (EL CARMEN DE SIQUIRRES) | airport | Costa Rica | 10.20 | -83.47 | 56 | 0 | |
| MRFI (NUEVO PALMAR SUR) | airport | Costa Rica | 8.92 | -83.51 | 49 | 0 | |
| MRGF (GOLFITO) | airport | Costa Rica | 8.65 | -83.18 | 49 | 0 | |
| MRGP (GUAPILES) | airport | Costa Rica | 10.22 | -83.80 | 883 | 0 | |
| MRLB (DANIEL ODUBER QUIROS INTL) | airport | Costa Rica | 10.59 | -85.54 | 270 | 0 | |
| MRLC (LOS CHILES) | airport | Costa Rica | 11.04 | -84.71 | 131 | 0 | |
| MRLM (LIMON INTL) | airport | Costa Rica | 9.96 | -83.02 | 7 | 0 | |
| MRNS (NOSARA) | airport | Costa Rica | 9.98 | -85.65 | 33 | 0 | |
| MROC (JUAN SANTAMARIA INTL) | airport | Costa Rica | 9.99 | -84.21 | 3021 | 0 | |
| MRPD (PANDORA) | airport | Costa Rica | 9.73 | -82.98 | 98 | 0 | |
| MRPM (PALMAR SUR) | airport | Costa Rica | 8.95 | -83.47 | 49 | 0 | |
| MRPV (TOBIAS BOLANOS INTL) | airport | Costa Rica | 9.96 | -84.14 | 3287 | 0 | |
| MRQP (LA MANAGUA) | airport | Costa Rica | 9.44 | -84.13 | 85 | 0 | |
| MRSG (SANTA CLARA DE GUAPILES) | airport | Costa Rica | 10.29 | -83.71 | 262 | 0 | |
| MRSV (SAN VITO DE JAVA) | airport | Costa Rica | 8.83 | -82.96 | 3228 | 0 | |
| MRUP (UPALA) | airport | Costa Rica | 10.89 | -85.02 | 184 | 0 | |
| Macacona | city | Puntarenas | Costa Rica | 10.00 | -84.64 | 843 | 13092 |
| Maderal | city | Alajuela | Costa Rica | 9.97 | -84.51 | 1669 | 6423 |
| Madre de Dios | city | Limon | Costa Rica | 10.09 | -83.40 | 190 | 6221 |
| Madrigal | city | Puntarenas | Costa Rica | 8.45 | -83.51 | 0 | 1782 |
| Magallanes | city | Alajuela | Costa Rica | 10.07 | -84.51 | 3503 | 27868 |
| Magnolia | city | San Jose | Costa Rica | 9.33 | -83.80 | 1125 | 6479 |
| Maicillal | city | Guanacaste | Costa Rica | 9.88 | -85.31 | 324 | 3215 |
| Mal País | city | Puntarenas | Costa Rica | 9.60 | -85.14 | 341 | 3414 |
| Mandayure | city | Guanacaste | Costa Rica | 10.03 | -85.20 | 29 | 2596 |
| Mangos | city | Alajuela | Costa Rica | 9.94 | -84.42 | 892 | 10978 |
| Manila | city | Limon | Costa Rica | 10.17 | -83.41 | 108 | 7450 |
| Manila | city | Limon | Costa Rica | 10.18 | -83.38 | 68 | 7155 |
| Mansion | city | Guanacaste | Costa Rica | 10.10 | -85.37 | 242 | 4902 |
| Mantas | city | Puntarenas | Costa Rica | 9.69 | -84.65 | 830 | 1543 |
| Manzanillo | city | Puntarenas | Costa Rica | 9.70 | -85.22 | 0 | 3260 |
| Manzanillo | city | Limon | Costa Rica | 9.63 | -82.65 | 19 | 415 |
| Manzanillo | city | Puntarenas | Costa Rica | 10.13 | -85.02 | 88 | 3590 |
| Maquenal | city | Guanacaste | Costa Rica | 9.96 | -85.52 | 830 | 4917 |
| Maquencal | city | Alajuela | Costa Rica | 10.58 | -84.68 | 830 | 4321 |
| 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 | Limon | Costa Rica | 10.02 | -83.21 | 98 | 4736 |
| Maravilla | city | Guanacaste | Costa Rica | 10.02 | -85.42 | 1981 | 4915 |
| Marañonal | city | Puntarenas | Costa Rica | 10.00 | -84.66 | 830 | 14834 |
| Marbella | city | Guanacaste | Costa Rica | 10.08 | -85.76 | 150 | 3104 |
| Marcos | city | San Jose | Costa Rica | 9.66 | -84.02 | 5029 | 7638 |
| Margarita | city | Alajuela | Costa Rica | 10.65 | -84.79 | 288 | 2370 |
| Margarita | city | Limon | Costa Rica | 9.60 | -82.76 | 124 | 992 |
| Margarita | city | Limon | Costa Rica | 10.08 | -83.32 | 111 | 4768 |
| Margerita | city | Limon | Costa Rica | 9.60 | -82.76 | 124 | 992 |
| Margot | city | Cartago | Costa Rica | 9.91 | -83.68 | 2030 | 23163 |
| Marichal | city | Alajuela | Costa Rica | 9.92 | -84.51 | 830 | 7955 |
| Marina | city | Alajuela | Costa Rica | 10.38 | -84.38 | 1692 | 10787 |
| Marsella | city | Alajuela | Costa Rica | 10.34 | -84.25 | 1669 | 5267 |
| Martirio | city | Guanacaste | Costa Rica | 10.63 | -85.06 | 1807 | 5251 |
| Mata Limon | city | Puntarenas | Costa Rica | 9.93 | -84.71 | 88 | 10553 |
| 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 |
| Mata de Caña | city | San Jose | Costa Rica | 9.60 | -84.07 | 4189 | 6930 |
| Mata de Guineo | city | Cartago | Costa Rica | 9.88 | -83.80 | 4189 | 31034 |
| Mata de Limon | city | Puntarenas | Costa Rica | 9.93 | -84.71 | 88 | 10553 |
| Mata de Palo | city | San Jose | Costa Rica | 9.95 | -84.15 | 3349 | 320501 |
| Mata de Plátano | city | Cartago | Costa Rica | 9.95 | -84.01 | 4412 | 339445 |
| 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 | 10.55 | -85.77 | 0 | 1649 |
| Matapalo | city | San Jose | Costa Rica | 9.95 | -84.15 | 3349 | 320501 |
| Matapalo | city | Puntarenas | Costa Rica | 9.33 | -83.96 | 177 | 3413 |
| Matapalo | city | Guanacaste | Costa Rica | 10.36 | -85.81 | 200 | 3675 |
| Matina | city | Guanacaste | Costa Rica | 10.08 | -85.37 | 318 | 4883 |
| Matina | city | Limon | Costa Rica | 10.08 | -83.29 | 55 | 4768 |
| Matinilla | city | San Jose | Costa Rica | 9.89 | -84.17 | 4320 | 98088 |
| Matinilla | city | San Jose | Costa Rica | 9.87 | -84.25 | 3425 | 18558 |
| Matino | city | Limon | Costa Rica | 10.08 | -83.29 | 55 | 4768 |
| Maíz de Boruca | city | Puntarenas | Costa Rica | 9.02 | -83.41 | 1788 | 2816 |
| Maíz de los Uva | city | Puntarenas | Costa Rica | 9.05 | -83.46 | 1046 | 2740 |
| Medio Queso | city | Alajuela | Costa Rica | 10.97 | -84.62 | 114 | 2086 |
| Medios | city | Heredia | Costa Rica | 10.61 | -84.00 | 108 | 1461 |
| Mejico | city | Alajuela | Costa Rica | 11.00 | -85.06 | 121 | 7607 |
| Meneses | city | San Jose | Costa Rica | 9.97 | -83.97 | 5869 | 218956 |
| Mercede | city | Limon | Costa Rica | 10.18 | -83.61 | 311 | 6823 |
| Mercedes | city | Alajuela | Costa Rica | 9.99 | -84.39 | 2509 | 28011 |
| Mercedes | city | Heredia | Costa Rica | 10.01 | -84.13 | 3667 | 198808 |
| Mercedes | city | Guanacaste | Costa Rica | 9.99 | -85.37 | 1669 | 4293 |
| Mercedes | city | Alajuela | Costa Rica | 10.31 | -84.43 | 2854 | 21981 |
| Mercedes | city | San Jose | Costa Rica | 9.26 | -83.58 | 1932 | 14768 |
| Mercedes Norte | city | Heredia | Costa Rica | 10.01 | -84.13 | 3667 | 198808 |
| Mercedes Norte | city | San Jose | Costa Rica | 9.84 | -84.33 | 3618 | 14407 |
| Mercedes Sur | city | San Jose | Costa Rica | 9.82 | -84.36 | 3540 | 9782 |
| Mesa | city | San Jose | Costa Rica | 9.78 | -84.17 | 2519 | 13045 |
| Mesas | city | Puntarenas | Costa Rica | 9.61 | -84.37 | 997 | 4650 |
| Mesas | city | Guanacaste | Costa Rica | 10.21 | -84.91 | 879 | 4597 |
| Mesas | city | Cartago | Costa Rica | 9.88 | -83.78 | 3349 | 24047 |
| Mesas | city | Guanacaste | Costa Rica | 11.02 | -85.63 | 830 | 1897 |
| Mesas | city | San Jose | Costa Rica | 9.20 | -83.59 | 2509 | 29979 |
| Meseta | city | San Jose | Costa Rica | 9.78 | -84.15 | 3687 | 16321 |
| Mesetas | city | Puntarenas | Costa Rica | 10.04 | -84.67 | 830 | 9963 |
| Mesetas Arriba | city | Puntarenas | Costa Rica | 10.04 | -84.66 | 830 | 9527 |
| Meson | city | Alajuela | Costa Rica | 10.10 | -84.29 | 3451 | 51743 |
| Meson | city | San Jose | Costa Rica | 9.87 | -84.11 | 5029 | 175869 |
| Mexico | city | Alajuela | Costa Rica | 11.00 | -85.06 | 121 | 7607 |
| Mexico | city | San Jose | Costa Rica | 9.95 | -84.08 | 3733 | 623467 |
| Milla Cinco | city | Limon | Costa Rica | 10.18 | -83.49 | 131 | 7450 |
| Millal | city | Guanacaste | Costa Rica | 9.84 | -85.26 | 830 | 2989 |
| Mirador | city | Alajuela | Costa Rica | 10.52 | -84.60 | 830 | 4320 |
| Miramar | city | Puntarenas | Costa Rica | 10.09 | -84.73 | 1026 | 5393 |
| Miramar | city | Guanacaste | Costa Rica | 9.95 | -85.50 | 830 | 4917 |
| Miravalles | city | San Jose | Costa Rica | 9.42 | -83.68 | 3349 | 11654 |
| Moctezuma | city | Puntarenas | Costa Rica | 9.66 | -85.07 | 0 | 4558 |
| Mogos | city | Puntarenas | Costa Rica | 8.75 | -83.38 | 52 | 1836 |
| Mojica | city | Guanacaste | Costa Rica | 10.41 | -85.20 | 68 | 3022 |
| Mojones | city | Guanacaste | Costa Rica | 11.08 | -85.70 | 0 | 1728 |
| Mollejones | city | San Jose | Costa Rica | 9.23 | -83.64 | 2555 | 30866 |
| Mona | city | Puntarenas | Costa Rica | 8.60 | -83.09 | 160 | 3086 |
| Mongito | city | San Jose | Costa Rica | 9.92 | -84.07 | 4189 | 607422 |
| Montana | city | Alajuela | Costa Rica | 10.14 | -84.18 | 5967 | 59270 |
| Montana Azul | city | Heredia | Costa Rica | 10.19 | -84.15 | 5869 | 43274 |
| Montana Grande | city | Puntarenas | Costa Rica | 9.91 | -85.04 | 232 | 6346 |
| 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 Redondo | city | San Jose | Costa Rica | 9.79 | -84.12 | 3681 | 37803 |
| Monte Romo | city | Guanacaste | Costa Rica | 10.00 | -85.38 | 2509 | 4467 |
| Monte Verde | city | Puntarenas | Costa Rica | 10.30 | -84.81 | 5029 | 5629 |
| Montecristo | city | Guanacaste | Costa Rica | 10.55 | -85.00 | 2509 | 5316 |
| Montecristo | city | Alajuela | Costa Rica | 10.91 | -84.98 | 137 | 1490 |
| Montelimar | city | San Jose | Costa Rica | 9.62 | -84.51 | 334 | 3021 |
| Montenegro | city | Guanacaste | Costa Rica | 10.47 | -85.21 | 150 | 1876 |
| Montenegro | city | Alajuela | Costa Rica | 10.91 | -84.98 | 137 | 1490 |
| Montero | city | Heredia | Costa Rica | 9.98 | -84.05 | 4189 | 448182 |
| Montero | city | Puntarenas | Costa Rica | 10.11 | -85.18 | 255 | 1935 |
| Monterrey | city | Alajuela | Costa Rica | 10.54 | -84.66 | 1243 | 4321 |
| Monterrey | city | San Jose | Costa Rica | 9.76 | -84.11 | 3612 | 25667 |
| Monteverde | city | Guanacaste | Costa Rica | 10.59 | -85.29 | 341 | 1639 |
| Monteverde | city | Limon | Costa Rica | 10.10 | -83.45 | 387 | 7240 |
| Montezuma | city | Puntarenas | Costa Rica | 9.66 | -85.07 | 0 | 4558 |
| Montoro | city | Heredia | Costa Rica | 9.98 | -84.05 | 4189 | 448182 |
| Mora | city | Guanacaste | Costa Rica | 9.88 | -85.42 | 393 | 2970 |
| Moracia | city | Guanacaste | Costa Rica | 10.24 | -85.40 | 285 | 4917 |
| Morado | city | San Jose | Costa Rica | 9.86 | -84.24 | 2923 | 15518 |
| Morales | city | Puntarenas | Costa Rica | 10.09 | -84.95 | 101 | 4889 |
| Moralito | city | Guanacaste | Costa Rica | 10.39 | -85.51 | 62 | 5851 |
| Moravia | city | Cartago | Costa Rica | 9.83 | -83.44 | 4189 | 5066 |
| Morazán | city | Alajuela | Costa Rica | 9.99 | -84.41 | 2522 | 30688 |
| Morote | city | Guanacaste | Costa Rica | 10.07 | -85.27 | 219 | 3474 |
| Morovia | city | Limon | Costa Rica | 10.07 | -83.55 | 1669 | 7450 |
| Mosca | city | Puntarenas | Costa Rica | 9.11 | -83.13 | 2808 | 2972 |
| Mozotal | city | San Jose | Costa Rica | 9.96 | -84.02 | 4297 | 376589 |
| Moín | city | Limon | Costa Rica | 10.00 | -83.08 | 55 | 38414 |
| Muelle | city | Alajuela | Costa Rica | 10.47 | -84.47 | 196 | 4321 |
| Muelle | city | Heredia | Costa Rica | 10.48 | -84.02 | 209 | 1900 |
| Muelle San Carlos | city | Alajuela | Costa Rica | 10.47 | -84.47 | 196 | 4321 |
| Muelle de San Carlos | city | Alajuela | Costa Rica | 10.47 | -84.47 | 196 | 4321 |
| Muelle del Arenal | city | Alajuela | Costa Rica | 10.53 | -84.52 | 232 | 4321 |
| Muneco | city | Cartago | Costa Rica | 9.79 | -83.91 | 4288 | 49678 |
| Muneco | city | Puntarenas | Costa Rica | 9.55 | -84.55 | 3 | 2165 |
| Murcia | city | Cartago | Costa Rica | 9.86 | -83.71 | 2805 | 14426 |
| Murciélago | city | Guanacaste | Costa Rica | 10.90 | -85.73 | 830 | 1713 |
| México | city | Limon | Costa Rica | 9.98 | -83.14 | 147 | 24578 |