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Câmara municipal vs. assembleia municipal vs. conselho municipal

While câmara municipal, assembleia municipal, and conselho municipal all translate loosely to "city council" or "town council" in English, they represent different branches of power and functions within local government. Câmara municipal is the most common term for the central governing body or building. Assembleia municipal operates as a local parliament that acts as a check on power. Conselho municipal generally refers to smaller, thematic advisory boards composed of citizens and experts.

Câmara municipal

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This is the most common term. In Portugal, the câmara municipal is the executive body (like a local cabinet) that manages the city day-to-day. In Brazil, it refers to the legislative body (house of councilors) that creates laws. In both countries, it also refers to the physical City Hall building.
Eu preciso ir à câmara municipal para tratar do meu passaporte.
(I need to go to city hall to deal with my passport.)
Os vereadores da câmara municipal votaram contra a proposta.
(The councilors of the city council voted against the proposal.)
O presidente da câmara municipal anunciou novas obras na cidade.
(The mayor (president of the city council) announced new construction works in the city.)
A câmara municipal está fechada aos domingos.
(The city hall is closed on Sundays.)

Assembleia municipal

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Used primarily in Portugal, this refers to the deliberative body or local parliament. It is a group of elected members who debate policies, approve the budget, and oversee the actions of the câmara municipal. It determines the broad rules rather than managing daily operations.
O orçamento da cidade foi aprovado pela assembleia municipal.
(The city budget was approved by the municipal assembly.)
A assembleia municipal reúne-se quatro vezes por ano.
(The municipal assembly meets four times a year.)
Ele foi eleito deputado da assembleia municipal na últimas eleições.
(He was elected deputy of the municipal assembly in the last elections.)
Os cidadãos podem assistir às sessões da assembleia municipal.
(Citizens can watch the sessions of the municipal assembly.)

Conselho municipal

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This term usually refers to specific advisory boards focused on a single topic (e.g., education, health, tourism) rather than the general government of the city. These councils provide technical advice and allow citizen participation, but they do not usually have the power to make laws.
O conselho municipal de saúde recomendou novas medidas de prevenção.
(The municipal health council recommended new prevention measures.)
Ela foi convidada para participar do conselho municipal de cultura.
(She was invited to participate in the municipal culture council.)
Houve uma reunião extraordinária do conselho municipal de educação.
(There was an extraordinary meeting of the municipal education council.)
O prefeito ouviu as sugestões do conselho municipal de turismo.
(The mayor listened to the suggestions from the municipal tourism council.)

Summary

To summarize: use câmara municipal when talking about the main institution, the Mayor's team, or the physical City Hall building. Use assembleia municipal when referring to the legislative parliament that approves budgets and oversees the city (mostly in Portugal). Use conselho municipal when referring to specific advisory groups focused on topics like health, education, or culture.