. The census agglomeration consists of Saint-Hyacinthe, Saint-Dominique, Saint-Simon. In the 2006 census, the census agglomeration had not included Saint-Dominique, but had included La Présentation and Saint-Barnabé-Sud. |area_metro_km2 = 328.53 |elevation_footnotes = |elevation_m = |population_footnotes = |population_total = 59614 |population_as_of = 2016 |population_density_km2 = 294.5 |population_urban = |population_density_urban_km2 = |population_metro_footnotes = |population_metro = 56794 |population_density_metro_km2 = 181.5 |population_blank1_title = Pop 2011-2016 |population_blank1 = 4.5% |population_density_blank1_km2 = |population_blank2_title = Dwellings |population_blank2 = 25,483 |population_note = |timezone = EST |utc_offset = −05:00 |timezone_DST = EDT |utc_offset_DST = −04:00 |postal_code_type = Postal code |postal_code =J2R-J2T |area_code = 450 and 579 |blank_name =Highways |blank_info = |website = |footnotes = }} Saint-Hyacinthe is a city in southwestern Quebec east of Montreal on the Yamaska River. The population as of the 2016 Canadian Census was 55,648. The city is located in Les Maskoutains Regional County Municipality of the Montérégie region, and is traversed by the Yamaska River. Quebec Autoroute 20 runs perpendicular to the river. Saint-Hyacinthe is the seat of the judicial district of the same name.[http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=2&file=/D_11/D11_A.HTM Territorial Division Act]. Revised Statutes of Quebec D-11.