654. For the purposes of this Act, the population of a municipality is that given in the last census recognized as valid pursuant to section 7 of the Cities and Towns Act (chapter C-19) or article 26 of the Municipal Code of Québec (chapter C-27.1), as the case may be, from the date of publication of an order of the Government under that section or article or from any later date fixed in the order for its coming into force.
In the case of a grouping or complete annexation, the population of the municipality resulting from the grouping or of the annexing municipality is the aggregate of the populations of all the municipalities affected by the grouping or annexation.
In the case of the annexation of part of the territory of a municipality or in the case of the annexation of a territory referred to in article 36 of the Municipal Code of Québec, the population of a municipality affected by the annexation may be established by the Minister of Municipal Affairs where he considers that the effect of the annexation has likely been to increase or reduce the population of the municipality to a figure above or below the figure prescribed in this Act. The Minister shall inform the municipality of the population figure he has established.
The population established under the second or third paragraph is valid until it is established under the first paragraph on the basis of a census that takes account of the grouping or annexation.