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. Author manuscript; available in PMC: 2012 Jun 1.
Published in final edited form as: J Trauma. 2011 Jun;70(6):1345–1353. doi: 10.1097/TA.0b013e3182191a1b

Figure 1. Map of the 4-county study region, including hospitals, trauma centers, major roadways and rivers.

Figure 1

County State Population Land area (square miles) Population density (persons per square mile) % > 65 years % < 18 years
Multnomah OR 726,855 435 1671 10.2% 21.2%
Washington OR 537,318 724 742 9.5% 25.6%
Clackamas OR 386,143 1,868 207 13.1% 23.3%
Clark WA 432,002 628 688 11.2% 26.2%
Totals: - 2,082,318 3,655 570 10.7% 23.7%

*Population demographics are based on 2009 estimates.13 The two trauma centers (TR) in Portland (Multnomah County) are Level I hospitals and the trauma center (TR) in Vancouver (Clark County) is a Level II hospital.