Opal is a hamlet in central Alberta, Canada within Thorhild County. It is located 5 kilometres (3.1 mi) north of Highway 28, approximately 53 kilometres (33 mi) northeast of Edmonton. Like many small communities, it was originally named Rutherford after Alberta's first premier, Alexander Cameron Rutherford but was renamed to the unique "Opal" when the first post office opened on November 15, 1912.
- Alberta Municipal Affairs (2010-04-01). "Specialized and Rural Municipalities and Their Communities". Retrieved 2010-07-05.
- Thorhild and District Historical Society (1985). Building and working together : a study of the Thorhild area. Vol. 1. p. 9.
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