My best guess would be to go to the Oregon's Dept of Revenue website and see if there is something posted there.
Kicker information is smack dab,center on the front page.
http://www.oregon.gov/DOR/
If you follow the link, this information is given on the full page of info:
Quote:
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You may also call our customer service help line at 1-800-356-4222 (toll free from an Oregon prefix), or 503-378-4988 (outside Oregon or in the Salem area).
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