Good question! A smart buyer researches things like crime rates when home shopping. A good Realtor can help you find those results.
Of course, crime statistics can vary by region of the city. A good starting point is local news reports. Also many police jurisdictions post crime stats on their websites.
www.city-data.com garners information from multiple sources on most large US cities. Here's a link to Sheridan:
Sheridan is serviced by the Yamhill County Sheriff's office which posts their crime mapping on www.crimereports.com.
The local paper is the Sheridan Sun.