Moving this over from the team size thread with a small update in team size.
Canada
Total number of athletes: 370 (226 will be at their first Olympics)
Women: 225, Men: 145 Youngest: Summer McIntosh, 14 (August 18, 2006), Swimming; Oldest – Mario Deslauriers, 56 (February 2, 1965), Equestrian
Team sports – 8; the most in a non-hosted or non-boycotted Games
Sets of siblings:
Gabriela DeBues-Stafford (Athletics) and Lucia Stafford (Athletics)
Halle Pratt (Artistic Swimming) and Cole Pratt (Swimming)
Claire Wright (Water Polo) and Emma Wright (Water Polo)
Children of Olympians:
Axelle Crevier, Water Polo (Mother Marie-Claude Deslières, Water Polo)
Tali Darsigny, Weightlifting (Father Yvan, Weightlifting)
Nicholas Hoag, Volleyball (Father Glenn, Volleyball)
Lynda Kiejko, Shooting (Father Bill Hare, Shooting)
Kai Langerfeld, Rowing (Father York, Rowing)
Summer McIntosh, Swimming (Mother Jill Horstead, Swimming)
Mariah Millen, Sailing (Father John, Sailing)
Jordan Steen, Wrestling (Father Dave, Athletics and Mother Andrea Page, Athletics)
Ali ten Hove, Sailing (Father Martin, Sailing)
Avalon Wasteneys, Rowing (Mother Heather Clarke, Rowing)
Jillian Weir, Athletics (Father Robert, Athletics)
Provincial and territorial breakdown (by hometown):
Ontario: 171
Quebec: 58
British Columbia: 95
Nova Scotia: 8
Alberta: 28
Manitoba: 5
Saskatchewan: 3
Athletes with hometowns outside Canada: 2
New Brunswick: 1
Newfoundland and Labrador: 0
Northwest Territories: 0
Nunavut: 0
Prince Edward Island: 0
Yukon: 0
Athletes who previously attended a Games:
Olympic Games (Summer): 144
Youth Olympic Games (Summer): 16
Olympic Winter Games: 2
By Olympic Games (Summer):
Los Angeles 1984: 1
Seoul 1988: 1
Athens 2004: 4
Beijing 2008: 17
London 2012: 33
Rio 2016: 134
By Youth Olympic Games (Summer):
Singapore 2010: 3
Nanjing 2014: 8
Buenos Aires 2018: 5
By Olympic Winter Games:
Vancouver 2010: 1
Sochi 2014: 2
PyeongChang 2018: 1