| Name | Country | Feature class | Latitude | Longitude | |
|---|---|---|---|---|---|
4001  | Mongito | Costa Rica, San José San José > San Sebastián | populated place | N 9° 55′ 10'' | W 84° 4′ 51'' |
| 4002 | Mona | Costa Rica, Puntarenas Province Golfito > Golfito | populated place | N 8° 35′ 57'' | W 83° 5′ 34'' |
| 4003 | Mollejones Mollejones | Costa Rica, San José Pérez Zeledón > Platanares | populated place | N 9° 13′ 46'' | W 83° 38′ 24'' |
| 4004 | Moín | Costa Rica, Limón Province Limón > Limón | populated place | N 9° 59′ 23'' | W 83° 5′ 35'' |
| 4005 | Mogos Mogos | Costa Rica, Puntarenas Province Osa > Sierpe | populated place | N 8° 44′ 48'' | W 83° 22′ 50'' |
| 4006 | Miravalles Miravalles | Costa Rica, San José Pérez Zeledón > San Isidro de El General | populated place | N 9° 25′ 11'' | W 83° 40′ 40'' |
| 4007 | Miramar Miramar | Costa Rica, Guanacaste Province Nicoya > Belén de Nosarita | populated place | N 9° 57′ 11'' | W 85° 29′ 54'' |
| 4008 | Mirador Mirador | Costa Rica, Alajuela Province San Carlos > Monterrey | populated place | N 10° 31′ 10'' | W 84° 35′ 53'' |
| 4009 | Millal Millal | Costa Rica, Guanacaste Province Nandayure > Bejuco | populated place | N 9° 50′ 26'' | W 85° 15′ 26'' |
| 4010 | Milla Cinco Milla Cinco | Costa Rica, Limón Province Siquirres > El Cairo | populated place | N 10° 10′ 41'' | W 83° 29′ 36'' |
| 4011 | Barrio México Barrio Mexico,Mexico,México | Costa Rica, San José San José > Merced | section of populated place | N 9° 57′ 0'' | W 84° 5′ 0'' |
| 4012 | México Mexico,México | Costa Rica, Limón Province Limón > Río Blanco | populated place | N 9° 58′ 54'' | W 83° 8′ 31'' |
| 4013 | Mesetas Arriba Mesetas Arriba | Costa Rica, Puntarenas Province Esparza > San Jerónimo | populated place | N 10° 2′ 31'' | W 84° 39′ 27'' |
| 4014 | Meseta Meseta | Costa Rica, San José Aserrí > Vuelta de Jorco | populated place | N 9° 46′ 37'' | W 84° 9′ 13'' |
| 4015 | Mesas Mesas | Costa Rica, Puntarenas Province Parrita > Parrita | populated place | N 9° 36′ 20'' | W 84° 22′ 2'' |
| 4016 | Mesas Mesas | Costa Rica, San José Pérez Zeledón > Pejibaye | populated place | N 9° 11′ 51'' | W 83° 35′ 34'' |
| 4017 | Mesa Mesa | Costa Rica, San José Acosta > Cangrejal | populated place | N 9° 46′ 30'' | W 84° 10′ 18'' |
| 4018 | Mercedes Sur Mercedes Sur | Costa Rica, San José Puriscal > Mercedes Sur | populated place | N 9° 49′ 24'' | W 84° 21′ 11'' |
| 4019 | Mercedes Norte | Costa Rica, San José Puriscal > Mercedes Sur | populated place | N 9° 50′ 10'' | W 84° 19′ 34'' |
| 4020 | Mercedes Mercedes | Costa Rica, Alajuela Province San Carlos > Quesada | populated place | N 10° 18′ 35'' | W 84° 25′ 32'' |
| 4021 | Mercedes Mercedes | Costa Rica, Guanacaste Province Hojancha > Monte Romo | populated place | N 9° 59′ 12'' | W 85° 22′ 7'' |
| 4022 | Mercedes Mercedes | Costa Rica, Alajuela Province Atenas > Mercedes | populated place | N 9° 59′ 15'' | W 84° 24′ 3'' |
| 4023 | Meneses | Costa Rica, San José Goicoechea > Rancho Redondo | populated place | N 9° 58′ 0'' | W 83° 58′ 0'' |
| 4024 | Medio Queso Medio Queso | Costa Rica, Alajuela Province Los Chiles > Los Chiles | populated place | N 10° 57′ 56'' | W 84° 37′ 15'' |
| 4025 | Matinilla Matinilla | Costa Rica, San José Mora > Guayabo | populated place | N 9° 52′ 3'' | W 84° 14′ 55'' |
| 4026 | Matina Matina | Costa Rica, Guanacaste Province Nicoya > Mansión | populated place | N 10° 4′ 21'' | W 85° 22′ 15'' |
4027  | Bahía Matapalo Bahia Gorda,Bahia Matapalo,Bahía Gorda,Bahía Matapalo,Gorda Bay | Costa Rica, Guanacaste Province | bay | N 10° 34′ 0'' | W 85° 46′ 0'' |
| 4028 | Matapalo | Costa Rica, Guanacaste Province Carrillo > Sardinal | populated place | N 10° 32′ 10'' | W 85° 46′ 3'' |
| 4029 | Matapalo Matapalo | Costa Rica, Guanacaste Province Santa Cruz > Cabo Velas | populated place | N 10° 21′ 40'' | W 85° 48′ 35'' |
| 4030 | Mata de Guineo Mata de Guineo | Costa Rica, Cartago Province Alvarado > Cervantes | populated place | N 9° 52′ 54'' | W 83° 47′ 56'' |
| 4031 | Mata de Caña Mata de Cana,Mata de Caña | Costa Rica, Guanacaste Province Tilarán > Arenal | populated place | N 10° 32′ 9'' | W 84° 52′ 38'' |
| 4032 | Mata de Caña Mata de Cana,Mata de Caña | Costa Rica, San José Tarrazú > San Lorenzo | populated place | N 9° 37′ 33'' | W 84° 3′ 10'' |
| 4033 | Martirio Martirio | Costa Rica, Guanacaste Province Cañas > Palmira | populated place | N 10° 37′ 31'' | W 85° 3′ 28'' |
| 4034 | Marsella Marsella | Costa Rica, Alajuela Province San Carlos > Venecia | populated place | N 10° 20′ 16'' | W 84° 15′ 10'' |
| 4035 | Marichal Marichal | Costa Rica, Alajuela Province Orotina > Orotina | populated place | N 9° 55′ 7'' | W 84° 30′ 10'' |
| 4036 | Margarita Margarita | Costa Rica, Alajuela Province Guatuso > San Rafael | populated place | N 10° 38′ 53'' | W 84° 47′ 24'' |
| 4037 | Margarita Margarita | Costa Rica, Limón Province Matina > Batán | populated place | N 10° 4′ 54'' | W 83° 19′ 20'' |
| 4038 | Marbella Marbella | Costa Rica, Guanacaste Province Santa Cruz > Cuajiniquil | populated place | N 10° 5′ 1'' | W 85° 45′ 48'' |
| 4039 | Maravilla Maravilla | Costa Rica, Limón Province Matina > Carrandi | populated place | N 10° 1′ 28'' | W 83° 13′ 25'' |
| 4040 | Maravilla Maravilla | Costa Rica, Guanacaste Province Hojancha > Hojancha | populated place | N 10° 1′ 8'' | W 85° 25′ 23'' |
| 4041 | Marañonal Maranonal,Marañonal | Costa Rica, Puntarenas Province Esparza > Espíritu Santo | populated place | N 10° 0′ 10'' | W 84° 39′ 28'' |
| 4042 | Maquencal Maquencal | Costa Rica, Alajuela Province San Carlos > Monterrey | populated place | N 10° 34′ 47'' | W 84° 40′ 45'' |
4043  | Playa de Manzanillo | Costa Rica, Puntarenas Province | beach | N 9° 41′ 42'' | W 85° 12′ 34'' |
| 4044 | Manzanillo | Costa Rica, Puntarenas Province Puntarenas > Cóbano | populated place | N 9° 41′ 47'' | W 85° 12′ 11'' |
| 4045 | Mano de Tigre | Costa Rica, Puntarenas Province Buenos Aires > Boruca | mountain | N 9° 2′ 0'' | W 83° 21′ 0'' |
| 4046 | Manila Manila | Costa Rica, Limón Province Siquirres > Pacuarito | populated place | N 10° 10′ 1'' | W 83° 24′ 34'' |
| 4047 | Mangos Mangos | Costa Rica, Alajuela Province Atenas > Escobal | populated place | N 9° 56′ 9'' | W 84° 25′ 6'' |
| 4048 | Maíz de Boruca Maiz de Boruca,Maíz de Boruca | Costa Rica, Puntarenas Province Buenos Aires > Colinas | populated place | N 9° 1′ 21'' | W 83° 24′ 37'' |
| 4049 | Maicillal Maicillal | Costa Rica, Guanacaste Province Nandayure > Bejuco | populated place | N 9° 52′ 31'' | W 85° 18′ 28'' |
| 4050 | Magallanes Magallanes | Costa Rica, Alajuela Province San Ramón > Santiago | populated place | N 10° 4′ 3'' | W 84° 30′ 4'' |
by