Oregon:ORS 811.111(1)(d)(D)

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811.111 Violating a speed limit; penalty.
(1) A person commits the offense of violating a speed limit if the person:
(d) Drives a vehicle upon a highway in any city at a speed greater than a speed posted by authority granted under ORS 810.180 or, if no speed is posted, the following:
(D) Twenty-five miles per hour on a highway in a residence district if the highway is not an arterial highway.

(Source: http://www.leg.state.or.us/ors/811.html)