It's important to note that even in these countries, there may be exceptions for certain types of data or specific agencies. Additionally, the concept of "public domain" may be interpreted differently in various legal systems.
Also, many other countries have open data policies that, while not explicitly declaring data as public domain, provide very permissive usage rights. Examples include Germany, Sweden, Norway, and Spain.
For the most accurate and up-to-date information, it's always best to check the specific terms of use on the government website you're interested in, as policies can change and there may be variations between different agencies within the same government.