Primero de Marzo (or 1° de Marzo) is a small town and district in the marshy lowlands of the Cordillera Department in Paraguay. The area is located near the shallow meandering river Yhaguy which locals utilize primarily for fishing and recreation. Primero de Marzo's name is derived from the date March 1, 1870, when then Paraguayan President Francisco Solano López was killed by Brazilian troops at Cerro Corá, thereby ending the bloody War of the Triple Alliance.

According to the 2002 National Paraguayan census, Primero de Marzo has a population of 6,019 inhabitants: 3,210 male and 2,809 female. 795 inhabitants live in the urban center of Primero de Marzo while another 5,224 maintain dwellings in the various surrounding rural campos. Some of the larger outlying rural campos include General Diaz, Sargento Cabellero, San Isidro, and Mariscal Estigarribia. Running water and electricity is available to the urban inhabitants, but only some of the rural campos. There are a very few landlines for telephone service in the area. The most reliable being at the Municipality and the Cooperative, Niño Jesus Ltd. Currently, there is not any internet or cellular phone service in the area due to the geography and poor public infrastructure.

Primero de Marzo was founded in 1931 as "Colonia Primero de Marzo" under the aegis of the district of Caraguatay. On June 23, 1955, the town was declared its own departmental district by presidential decree from dictator Alfredo Stroessner. Primero de Marzo is sometimes called by its lesser known name of Colonia Alphonso Tranquera. The town celebrates its Fiesta Patronal on December 25 in honor of its patron saint Niño Jesus. Other large fiestas celebrated in the area include Cerra Corá (March 1), Pascua (Easter), la fiesta de San Juan (June), and la fiesta de San Blas (February 3).

A rural agricultural area, Primero de Marzo is centered in a region well known for its high-quality production of petitgrain (orange essence) from the bitter orange tree (citrus aurantium). This petitgrain is generally exported to Europe for use in perfumes and skin care products. The vast majority of the harvest, production, and sale of this crop of petitgrain is organized by members of the small credit and marketing cooperative Niño Jesus Ltd. Other important crops in the area include mandioca (yuca), ka'a he'ê (stevia), watermelon, tomato, pineapple, cotton, and soybeans. Fishfarming production of Tilapia is becoming increasingly important in the rural campos.

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