The Independent Party of Oregon (IPO) is a political party in the U.S. state of Oregon. The IPO is Oregon's third-largest political party and the largest minor party of the state, with 110,042 registrants since its inception in January 2007 making up 5.07% of Oregon's registered voters. At its current growth rate it is the fastest growing minor party in the state and has surpassed the Republican party in membership increases since its inception. The party experienced a 28.1% increase from January 2010 to January 2011, giving it larger gains than the Democrats (-1.9%) and Republican (0.6%) for 2010.