At most registered sex offenders per capita: http://www.missingkids.com/en_US/documents/sex-offender-map.pdf
"Sex offender" is an empty label which is applied by completely different criteria in each and every state depending on that state's laws. Oregon's Measure 11, written and passed solely by the efforts of the private security industry to boost the rate of incarceration so they may profit, has probably the broadest definition of the misleading term "sex offender". It is written so loosely that it includes anyone who so much as consensually kisses or hugs as long as one of the consenting parties is a minor and the other consenting party is 3 years and one day older than the other. There are thousands of Oregonians on the registry that fall into this category, many of them now happily married to each other. Oregon's Measure 11 has cost Oregonians more than any other law ever enacted in the state and does nothing at all to protect Oregonians. It needs to be repealed, and private companies need to be completely removed from our corrections system.
MARIS actually has a point; my buddy from high school was caught up in a Measure 11 case. He played doctor with a girl when he was 12 and she was 9, then years later, after she'd been assaulted by someone else, her attorney asked her to remember back to any other time she'd been compromised, and she brought my buddy's name up. Short story: legit assaulter had a good lawyer, my buddy has a court appointed lawyer... assaulter goes free, my buddy pleads guilty to a misdemeanor that Measure 11 turns into a felony, gets 18 months in prison and registry for life. Corner case, to be sure, but it does happen.