<Tr> <Td> Marion County </Td> <Td> 047 </Td> <Td> Salem </Td> <Td> 1843 </Td> <Td> One of the original four districts of the Oregon territory </Td> <Td> Francis Marion (1732--1795), American Revolutionary War general </Td> <Td> 7005333950000000000 ♠ 333,950 </Td> <Td> 7003118500000000000 ♠ 1,185 sq mi (7003306900000000000 ♠ 3,069 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Morrow County </Td> <Td> 049 </Td> <Td> Heppner </Td> <Td> 1885 </Td> <Td> Western portion of Umatilla County and a small portion of eastern Wasco County </Td> <Td> Jackson L. Morrow, a state representative who advocated for the formation of the county . </Td> <Td> 7004117450000000000 ♠ 11,745 </Td> <Td> 7003203300000000000 ♠ 2,033 sq mi (7003526500000000000 ♠ 5,265 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Multnomah County </Td> <Td> 051 </Td> <Td> Portland </Td> <Td> 1854 </Td> <Td> Eastern part of Washington and the northern part of Clackamas counties </Td> <Td> The Indian village of Multnomah, on Sauvie Island . The word is derived from nematlnomaq, probably meaning downriver . Lewis and Clark made note of the name in 1805, and applied that name to all local Indians . </Td> <Td> 7005790670000000000 ♠ 790,670 </Td> <Td> 7002435000000000000 ♠ 435 sq mi (7003112700000000000 ♠ 1,127 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Polk County </Td> <Td> 053 </Td> <Td> Dallas </Td> <Td> 1845 </Td> <Td> Yamhill District </Td> <Td> James Knox Polk (1795--1849), President of the United States at the time of the county's creation </Td> <Td> 7004797300000000000 ♠ 79,730 </Td> <Td> 7002741000000000000 ♠ 741 sq mi (7003191900000000000 ♠ 1,919 km) </Td> <Td> </Td> </Tr>

Map of counties in the state of oregon