OOS percentages are only part of the story.
In West Virginia, for example, there's a high OOS percentage (like 30%), but that 30% is drawn solely from the surrounding Appalachian states.
U of Washington serves as the med school for 5 states (27% of the US landmass, 3% of the US population), so the OOS percentage combines a very high percentage for the region and a very low percentage for outside the region. The state govt's of AK, ID, MT & WY each "buy" a number of seats at UWash. Generally, states without med schools have regional buddies, and that contorts the OOS numbers.
You also have to look at how many apps a school gets. U of Vermont is famous, for example, for having more total seats than total instate applicants (2009: 115 seats, 85 VT apps, 27 VT matrics). Wide open field for OOS at that school. But this is well known, so there's a completely disproportionate number of OOS apps - like 6000 - so Vermont has no motivation to look at less-than-compelling apps from OOS students.
Similarly, OOS percentages are not high fidelity. It's not clear that a student who is a Texas resident, but went to college in Massachusetts, and has a current mailing address in MA, is counted as TX, when the school reports its numbers to AAMC. The person who gathers up the numbers may be more interested in making the school look worldly than in reporting numbers that help you make decisions.
You can assume that public schools are interested in seeding their student body with high-stats OOS diversity. You can assume that public schools are not motivated to collect another state's average or below-average applicants. You can assume that the economy has forced public schools to be more interested in OOS applicants from whom much higher tuition can be collected - any revenue source in a storm - but that such practices piss off the state's taxpayers ("you took 4 kids from California, instead of my hard-working 3.4/28 Suzie, after all the years I paid property taxes?!?!").
In general, if you have average-or-better stats (3.6+/31+), or you have a wicked compelling story and reasonable stats, it's worth your time to look at applying to public schools out of your state. With an average-or-worse application, other states are less interested in you than your own state.
Best of luck to you.