| Name | Country | Feature class | Latitude | Longitude | |
|---|---|---|---|---|---|
1901  | Mercedes Mercedes | Costa Rica, Alajuela Province Atenas > Mercedes | populated place | N 9° 59′ 15'' | W 84° 24′ 3'' |
| 1902 | Meneses | Costa Rica, San José Goicoechea > Rancho Redondo | populated place | N 9° 58′ 0'' | W 83° 58′ 0'' |
| 1903 | Medio Queso Medio Queso | Costa Rica, Alajuela Province Los Chiles > Los Chiles | populated place | N 10° 57′ 56'' | W 84° 37′ 15'' |
| 1904 | Matinilla Matinilla | Costa Rica, San José Mora > Guayabo | populated place | N 9° 52′ 3'' | W 84° 14′ 55'' |
| 1905 | Matina Matina | Costa Rica, Guanacaste Province Nicoya > Mansión | populated place | N 10° 4′ 21'' | W 85° 22′ 15'' |
| 1906 | Matapalo | Costa Rica, Guanacaste Province Carrillo > Sardinal | populated place | N 10° 32′ 10'' | W 85° 46′ 3'' |
| 1907 | Matapalo Matapalo | Costa Rica, Guanacaste Province Santa Cruz > Cabo Velas | populated place | N 10° 21′ 40'' | W 85° 48′ 35'' |
| 1908 | Mata de Guineo Mata de Guineo | Costa Rica, Cartago Province Alvarado > Cervantes | populated place | N 9° 52′ 54'' | W 83° 47′ 56'' |
| 1909 | 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'' |
| 1910 | 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'' |
| 1911 | Martirio Martirio | Costa Rica, Guanacaste Province Cañas > Palmira | populated place | N 10° 37′ 31'' | W 85° 3′ 28'' |
| 1912 | Marsella Marsella | Costa Rica, Alajuela Province San Carlos > Venecia | populated place | N 10° 20′ 16'' | W 84° 15′ 10'' |
| 1913 | Marichal Marichal | Costa Rica, Alajuela Province Orotina > Orotina | populated place | N 9° 55′ 7'' | W 84° 30′ 10'' |
| 1914 | Margarita Margarita | Costa Rica, Alajuela Province Guatuso > San Rafael | populated place | N 10° 38′ 53'' | W 84° 47′ 24'' |
| 1915 | Margarita Margarita | Costa Rica, Limón Province Matina > Batán | populated place | N 10° 4′ 54'' | W 83° 19′ 20'' |
| 1916 | Marbella Marbella | Costa Rica, Guanacaste Province Santa Cruz > Cuajiniquil | populated place | N 10° 5′ 1'' | W 85° 45′ 48'' |
| 1917 | Maravilla Maravilla | Costa Rica, Limón Province Matina > Carrandi | populated place | N 10° 1′ 28'' | W 83° 13′ 25'' |
| 1918 | Maravilla Maravilla | Costa Rica, Guanacaste Province Hojancha > Hojancha | populated place | N 10° 1′ 8'' | W 85° 25′ 23'' |
| 1919 | Marañonal Maranonal,Marañonal | Costa Rica, Puntarenas Province Esparza > Espíritu Santo | populated place | N 10° 0′ 10'' | W 84° 39′ 28'' |
| 1920 | Maquencal Maquencal | Costa Rica, Alajuela Province San Carlos > Monterrey | populated place | N 10° 34′ 47'' | W 84° 40′ 45'' |
| 1921 | Manzanillo | Costa Rica, Puntarenas Province Puntarenas > Cóbano | populated place | N 9° 41′ 47'' | W 85° 12′ 11'' |
| 1922 | Manila Manila | Costa Rica, Limón Province Siquirres > Pacuarito | populated place | N 10° 10′ 1'' | W 83° 24′ 34'' |
| 1923 | Mangos Mangos | Costa Rica, Alajuela Province Atenas > Escobal | populated place | N 9° 56′ 9'' | W 84° 25′ 6'' |
| 1924 | 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'' |
| 1925 | Maicillal Maicillal | Costa Rica, Guanacaste Province Nandayure > Bejuco | populated place | N 9° 52′ 31'' | W 85° 18′ 28'' |
| 1926 | Magallanes Magallanes | Costa Rica, Alajuela Province San Ramón > Santiago | populated place | N 10° 4′ 3'' | W 84° 30′ 4'' |
| 1927 | Madrigal | Costa Rica, Puntarenas Province Golfito > Puerto Jiménez | populated place | N 8° 27′ 1'' | W 83° 31′ 4'' |
| 1928 | Madre de Dios | Costa Rica, Limón Province Siquirres > Pacuarito | populated place | N 10° 5′ 36'' | W 83° 24′ 3'' |
| 1929 | Maderal Maderal | Costa Rica, Alajuela Province San Mateo > San Mateo | populated place | N 9° 58′ 3'' | W 84° 30′ 40'' |
| 1930 | Macacona Macacona | Costa Rica, Puntarenas Province Esparza > Macacona | populated place population 840 | N 10° 0′ 9'' | W 84° 38′ 23'' |
| 1931 | Luisiana Luisiana | Costa Rica, Cartago Province Paraíso > Paraíso | populated place | N 9° 49′ 23'' | W 83° 50′ 48'' |
| 1932 | Luisa Luisa | Costa Rica, Alajuela Province Sarchí > Sarchí Norte | populated place | N 10° 7′ 8'' | W 84° 20′ 18'' |
| 1933 | Lourdes Lourdes | Costa Rica, Alajuela Province Naranjo > Cirrí Sur | populated place | N 10° 8′ 34'' | W 84° 22′ 18'' |
| 1934 | Lourdes | Costa Rica, Cartago Province Cartago > Aguacaliente o San Francisco | populated place | N 9° 49′ 37'' | W 83° 54′ 31'' |
| 1935 | Louisiana Louisiana | Costa Rica, Limón Province Siquirres > El Cairo | populated place | N 10° 7′ 58'' | W 83° 31′ 45'' |
| 1936 | Lotsinyak | Costa Rica, Limón Province Talamanca > Telire | populated place | N 9° 24′ 0'' | W 83° 14′ 0'' |
| 1937 | Yoses | Costa Rica, San José Montes de Oca > San Pedro | populated place | N 9° 55′ 50'' | W 84° 3′ 37'' |
| 1938 | Los Perdidos | Costa Rica, Guanacaste Province Nandayure | populated place | N 9° 49′ 0'' | W 85° 11′ 0'' |
| 1939 | Los Órganos | Costa Rica, Puntarenas Province Puntarenas > Paquera | populated place | N 9° 49′ 0'' | W 84° 54′ 0'' |
| 1940 | Los Cerros | Costa Rica, Guanacaste Province Nicoya > Mansión | populated place | N 10° 5′ 0'' | W 85° 23′ 0'' |
| 1941 | Londres Londres | Costa Rica, Puntarenas Province Quepos > Naranjito | populated place | N 9° 27′ 41'' | W 84° 3′ 59'' |
| 1942 | Lombardía | Costa Rica, Guanacaste Province Tilarán > Tilarán | populated place | N 10° 27′ 9'' | W 84° 57′ 22'' |
| 1943 | Loma Bonita | Costa Rica, Guanacaste Province Santa Cruz > Cartagena | populated place | N 10° 24′ 0'' | W 85° 39′ 0'' |
| 1944 | Loma Loma | Costa Rica, Puntarenas Province Parrita > Parrita | populated place | N 9° 32′ 32'' | W 84° 23′ 19'' |
| 1945 | Llano Hermoso Llano Hermoso | Costa Rica, San José Puriscal > Mercedes Sur | populated place | N 9° 49′ 37'' | W 84° 25′ 29'' |
| 1946 | Llano Grande Llano Grande | Costa Rica, San José Mora > Picagres | populated place | N 9° 53′ 27'' | W 84° 21′ 23'' |
| 1947 | Llano Brenes Llano Brenes | Costa Rica, Alajuela Province San Ramón > San Rafael | populated place | N 9° 59′ 41'' | W 84° 28′ 32'' |
| 1948 | Llano Bonito | Costa Rica, San José Mora > Colón | populated place | N 9° 54′ 0'' | W 84° 16′ 0'' |
| 1949 | Llano Bonito Llano Bonito | Costa Rica, San José Acosta > Cangrejal | populated place | N 9° 45′ 18'' | W 84° 12′ 16'' |
| 1950 | Llano Ángeles Llano Angeles,Llano Ángeles | Costa Rica, Cartago Province Cartago > Corralillo | populated place | N 9° 46′ 14'' | W 84° 1′ 58'' |
by