The Oregon Legislature passed a law in 1999 that prevented inmates in federal prisons from voting in local elections. Since Oregon had never had a federal prison, only state prisoners had previously been barred from voting. In 2000, the U.S. Census Bureau mistakenly listed the prison population in one census tract instead of the correct census tract. Oregon Secretary of State Bill Bradbury used the incorrect data when re-drawing the state's legislative districts as is done after each census. This small error of about 2000 people was enough to throw off the districts beyond their margin of acceptance and the Oregon Supreme Court ruled the Secretary must re-draw the boundary lines to match the correct data. The city also counts the prison population as part of the city's official population.