120. (1) Subject to section 11, for the application of this act, the population of a municipality is that given in the last census recognized as valid under section 4b of the Cities and Towns Act or section 16a of the Municipal Code, as the case may be, effective only from the date of publication of a Government order pursuant to this section.
(2) In a case of amalgamation or complete annexation of a municipality, the population of the new municipality or of the annexing municipality is made up of the sum of the populations of all the municipalities involved in the amalgamation or affected by the annexation, as determined in accordance with this section.
(3) In the case of the annexation of part of a municipality or of a territory that does not have any local municipal organization, the population of the municipality affected by annexation is that which the Government may establish, if the Minister of Municipal Affairs contends that the apparent effect of the annexation has been to increase the population of the municipality to 20 000, 50 000, 100 000, 250 000, 500 000 or 1 000 000 inhabitants or over, or to bring it below one of these figures, as the case may be.A Government order comes into force on the date of its publication in the Gazette officielle du Québec.
(4) The population of a municipality as determined pursuant to subparagraph 2 or 3 following amalgamation or annexation is valid only until it is determined in accordance with subparagraph 1.