Ontario (Canada) is 4,758 times larger than Grand Prairie, Texas.
Ontario is one of the ten provinces of Canada, located in east-central Canada. It is Canada's most populous province by a large margin, accounting for nearly 40% of all Canadians, and is the second largest province in total area. Wikipedia
Area: 226 km2 calculated
Grand Prairie is a city in Dallas, Ellis, and Tarrant counties in the U.S. state of Texas and is a part of the Mid-Cities region in the Dallas–Fort Worth metroplex. Wikipedia