He was born in Rigaud, Lower Canada, the son of Antoine Lalonde and Véronique Gemus. Lalonde was a partner in the firm Prévost, Hébert et Cie. In 1849, he married Marie-Claire-Louise Prévost. He was mayor of Sainte-Marthe from 1866 to 1868. He resigned his seat in the assembly in 1882 after being named an official in the courthouse at Montreal. Lalonde died in Montreal at the age of 66 and was buried in the Notre Dame des Neiges Cemetery.
His son Émery also represented Vaudreuil in the Quebec assembly.
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