Artificial intelligent assistant

Particle between city and prefecture? I'm trying to say, "I went to Oarai Town in Ibaraki Prefecture last year." > Is there supposed to be a comma or particle (perhaps ) between the city and prefecture? Please let me know if there is a better way to write this sentence.

I can't comment yet on the site (reputation) but the Japanese addressing system goes from largest to smallest. I would change the order and use but I'll defer to anyone else with more experience.

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