Seats are distributed using the D’Hondt method, known in Colombia as the cifra repartidora, which allocates seats proportionally according to the number of votes obtained.

A total of 3,231 candidates will compete for seats in Colombia’s congress in the legislative elections scheduled for March 8, according to the Registraduría Nacional del Estado Civil (RNEC), the authority responsible for organizing the country’s electoral processes. In total, 102 senators and 182 members of the House of Representatives will be elected.

According to the electoral authority, 1,124 candidates registered for the Senate and 2,107 for the House of Representatives, the two chambers that make up Colombia’s congress.

As the political analysis website Razón Pública explains, Colombia’s electoral system is based on proportional representation, which seeks to reflect the diversity of political opinions within society in the composition of Congress. For the Senate, or upper chamber, voters may cast their ballots for candidates anywhere in the country, as it operates under a national constituency. In contrast, the House of Representatives, or lower chamber, is elected through territorial constituencies by departments, including Bogotá as the Capital District.

According to the RNEC, 41,287,084 citizens are eligible to vote in the upcoming elections, a key figure because it influences how seats are allocated.

Senate elections

In this election, 102 senators will be chosen by popular vote. According to the Senate’s official website, 100 will be elected through a nationwide constituency and the remaining two seats are reserved for indigenous communities, a special constituency established by the 1991 Constitution to guarantee political representation for these groups.

Voters must choose between receiving the national ballot or the Indigenous constituency ballot, but they cannot vote in both.

House of Representatives elections

For the House of Representatives, 182 members will be elected, distributed as follows:

• Territorial constituencies: 161 seats allocated to departments and the Capital District of Bogotá.
• Special Transitional Peace Constituencies: 16 seats reserved for victims of the armed conflict, created by the Acto Legislativo 02 of 2021.
• Afro-descendant communities: 2 seats.
• Indigenous communities: 1 seat.
• Community of San Andrés (Raizal): 1 seat.
• Colombians living abroad: 1 seat.

Unlike the Senate, each department receives a specific number of seats based on its population, creating regional electoral dynamics in which local political leadership often plays a key role. In practice, more populous departments hold greater representation than smaller ones.

Both the Senate and the House of Representatives receive one additional seat after the presidential election, allocated to the candidate who obtains the second-highest number of votes.

How seats are allocated

Colombia’s electoral system is regulated by the Acto Legislativo 001 of 2003 and the Electoral Law, and operates under principles of proportional representation.

First, the valid votes obtained by each party list are counted. Only those lists that surpass a 3% threshold of total valid votes are eligible to participate in the distribution of seats. In the 2022 legislative elections, this threshold exceeded 509,000 votes.

According to projections by the Misión de Observación Electoral (MOE), the threshold for the Senate in the upcoming elections could reach around 600,000 votes.

This threshold is crucial because if, for example, a candidate obtains 450,000 votes but their party fails to pass the threshold, neither the candidate nor the party will secure a seat in Congress.

Among the lists that surpass the threshold, seats are distributed using the D’Hondt method, known in Colombia as the cifra repartidora, which allocates seats proportionally according to the number of votes obtained. In 2022, the seat-allocation quotient was 144,013 votes.

For the House of Representatives, the process is more complex because the threshold and D’Hondt method are applied separately within each department, producing different results across regions.

With closed lists, voters select only the political party or list as a whole, without choosing an individual candidate.

Open and closed lists

Under the Acto Legislativo 1 of 2003, political parties may register open lists or closed lists. With open lists, voters select a specific candidate within a party’s list. The vote counts both for the political party and for the individual candidate. Seats obtained by the party are then assigned to the candidates who received the highest number of votes, regardless of their initial position on the list.

With closed lists, voters select only the political party or list as a whole, without choosing an individual candidate. Seats are then allocated according to the order predetermined and registered at the start of the campaign by the party.

In the upcoming elections, two of Colombia’s most prominent political forces will present closed lists: the Pacto Histórico, the coalition led by current President Gustavo Petro, and the Centro Democrático, the right-wing party founded by former President Álvaro Uribe Vélez.

Photo courtesy of the National Civil Registry of Colombia,

Colombia’s presidential primaries are interparty, where broad coalitions decide on a candidate that the allied parties then agree to back.

This Sunday, March 8, 2026, Colombia will hold one of the most significant electoral events of the year’s political calendar. In addition to electing a new congress, voters will participate in the so-called Interparty Primaries, a mechanism through which political parties select their candidates for the presidential election scheduled for May 31.

According to the political analysis website Razón Pública, these consultations seek to “build broad coalitions composed of parties, movements, and independent candidacies.” In practice, they allow different political sectors to determine through open voting who will represent each coalition in the presidential race.

Political parties seek to boost their chances in the presidential race or strengthen their leverage in potential coalition negotiations.

In total, three separate primaries will take place, each with its own ballot. Citizens may participate in only one of them by requesting the corresponding ballot when voting for Congress.

The first is the “Solutions Primary: Healthcare, Security and Education,” made up of parties from the political center. In this contest, former Bogotá mayor Claudia López faces independent lawyer Leonardo Huertas. According to the latest Invamer poll, López is the clear frontrunner, with a projected 92.9% voting preference, compared with her only opponent.

The second consultation represents the political right and includes nine pre-candidates in the so-called “Grand Primary for Colombia.”

Among the contenders are former ministers of previous governments Juan Carlos Pinzón (Defense), Mauricio Cárdenas (Finance), and David Luna (Information Technologies); former Antioquia governor Aníbal Gaviria; former Bogotá mayor Enrique Peñalosa; journalist Vicky Dávila; and three senators representing their respective parties: Juan Manuel Galán (Nuevo Liberalismo), Juan Daniel Oviedo (Con Toda con Colombia), and Paloma Valencia (Centro Democrático).

Polls consistently identify Paloma Valencia as the favorite to win the primary. The Invamer poll projects her with 41.6% of the vote, Atlas Intel 44.4%, and Guarumo-EcoAnalítica 40.6%, while the firm Gad3 also places her first but with a lower estimated vote share of 17%. Valencia has been campaigning nationwide accompanied by former president Álvaro Uribe Vélez, the leading figure of the Centro Democrático, and previously won her party’s internal selection process through a member survey held on December 15.

The third primary corresponds to the coalition known as the “Front for Life,” made up of left-wing candidates, although without the official backing of current President Gustavo Petro, who under Colombian law is prohibited from participating in electoral politics or promoting candidates.

Candidates in this race include Héctor Elías Pineda, a former member of the M-19 guerrilla movement (the same group Petro once belonged to); Edison Lucio Torres of the Partido de los Trabajadores (Worker’s Party); and independent candidate Martha Viviana Bernal.

Former senator Roy Barreras; and embattled former mayor of Medellín Daniel Quintero Calle registered through the Movimiento de Autoridades Indígenas de Colombia. Polls by Guarumo-EcoAnalítica (47.6%) and Invamer (68.1%) place Daniel Quintero as the leading candidate of this Primary. However, the firm Atlas Intel did not measure this coalition, arguing that it did not surpass the statistical threshold required.

What comes next in the political landscape after the Primaries?

According to Razón Pública, “once the March 8 voting concludes, the political landscape will enter a phase of critical decisions. The results will determine alliances and realignments ahead of the presidential first round.”

Across the political spectrum, the winners of each consultation will attempt to consolidate support to compete against other candidates who registered directly without participating in the consultations. These include Abelardo de la Espriella, a conservative lawyer and businessman who registered through citizen signatures; Iván Cepeda, the official candidate of the Pacto Histórico coalition led by President Petro and currently leading voting-intention polls; and Sergio Fajardo, who registered with the party Dignidad y Compromiso.

Under Colombia’s electoral Law (1475 of 2011), political parties may still modify or withdraw candidates until March 20. After that date, the presidential campaign will move toward the first round scheduled for May 31. If no candidate secures an absolute majority of the vote (50% plus one), the two candidates receiving the highest number of votes will compete in a runoff election on June 21, where the candidate with a simple majority will be elected president.

Photos courtesy of the Registraduría Nacional del Estado Civil