There a couple ways to define "lucky state". One factor is simply getting in if you are a marginal candidate. Another is cost and tuition issues.
One way is to look at the table
@gyngyn provided. Note take note of ratios ie for a state the percent of IS applicants who matriculated IS compared to % of IS applicants who matriculated OOS.
Another thing is to look at MSAR and see which state schools have a high percentage of % of IS applicants who were offered an interview. If you are a borderline candidate this is useful. Also useful is to see how many schools that state has.
Note these figures are
not up to date but I have in the past done this and looked at states that interview a high % of IS applicants. Of course the thing to consider which isn't really accounted for here is how competitive these schools are. Ohio State shows some IS bias but when you have median stats at 3.8/35 that doesn't necessarily mean your borderline 3.6/30 candidate is really at much of an advantage there.
Anyway here are what I would consider some lucky states. Note the 15 or so truly luckiest states only account for say 15% of all US applicants.
Alabama: U of Alabama interviews about half of their IS applicants. So does South Alabama. Theoretically someone who is an AL resident has a 75% of nabbing a II from there(of course all kinds of qualifications and reasons why that is misleading).
Arkansas: Interviews a very high % of IS applicants. I believe 2/3 or so.
Georgia: I think Mercer and MCG both interview about 40% of IS applicants.
Iowa: I believe U of Iowa interviews close to 80% of IS applicants.
Indiana and Kansas: Both have state schools that interview around 70% of IS applicants from the info I have(could be wrong)
Louisiana: Both the LSU schools interview roughly half of IS applicants.
Michigan: Central Michigan and Wayne State interview about 30% of IS applicants. Michigan State and Oakland also have some bias in terms of it being easier to get a II IS.
Mississippi: Interviews about 2/3 of IS applicants.
Nebraska: U of Nebraska interviews over half of their IS applicants if I'm not mistaken. Even Creighton interviews around 20% I believe.
North Dakota and South Dakota: Both interview well over half of IS applicants.
Nevada: Also a school that interviews over half of IS applicants I believe.
South Carolina: One of the really lucky states in the country. Greenville, U of SC and MU SC all interview close to half of their IS applicants I believe.
Tennessee: U of T interviews a high number of applicants and I believe ETSU interviews around 1/3.
Utah: Yes it is competitive but a high number of IS applicants get an interview.
West Virginia: WVU interviews over half of their IS applicants and their median MCAT is under 30. Marshall also interviews a high number and has a median GPA under 3.6 I believe. Gem of a state for medical school applicants.
PA: This is a very competitive state with tons of great applicants but TCMC interviews close to 40% of IS applicants and I believe Drexel and Temple interview around 25% of IS applicants. Penn State has about 20% of IS applicants interviewed to throw in there also. Also people from the western part of the state are in regional proximity for WVU which can make it a worthwhile app and I believe WVU interviews around 20-25% of their OOS applicants.
Arizona: Both their state schools interview a fair number of IS applicants(somewhere around 40% if I'm not mistaken).
North Carolina: Brody interviews about half their applicants and if your stats are on par with UNC(median 3.75/34 I believe) they interview a fairly strong number of IS applicants. Wake Forest also shows some IS bias in that around 20% or so of IS applicants get an interview .
Missouri: Columbia I believe interviews half of their IS applicants.
Ohio: Toledo and Wright State show IS bias( I believe 25-30% of IS applicants get an interview). Northeast Ohio is 98% IS'ers but they get lots of apps for few spots .If your stats are up to par Cincinnati and Ohio State I think both interview around 25% of IS applicants.
So there you have it a rough summary. I probably missed out some states but the key thing here is there are ALOT of lucky states. More than people tend to think and that's part of why CA people and the like have it rough.
If you want the luckiest of this bunch you'd have to start with West Virginia, South Carolina, Arkansas, Dakota's, Mississippi, Iowa, Arkansas, Nebraska, Nevada and Tennesseee.