@Dtown: I work for the state government and I can explain what I know. It depends on the state you reside in. There are some state which have their own State Based Marketplace (SBM) and there are other which rely on Federally Facilitated Marketplace(FFM). If your state has SBM then you cannot buy insurance through FFM. Either way here are some of the ways you can buy insurance outside of open enrollment period:
Life events that may qualify you for a Special Enrollment Period
Getting married
Having a baby
Adopting a child or placing a child for adoption or foster care
Losing other health coverage
Moving to a new residence
Gaining citizenship or lawful presence in the U.S.
Leaving incarceration
(Source: https://www.healthcare.gov/coverage-outside-open-enrollment/special-enrollment-period/)
If you change your address and apply for insurance either through FFM or SBM, you should be able to enroll outside open enrollment period and can get covered for rest of 2015.
[Note: Open enrollment for 2016 starts on November 1st, 2015 i.e. you can enroll for a plan for 2016]

@Meraj: It is hard to find health insurance coverage if you are outside of open enrollment even through private insurance company and even if you do, it is very expensive. I believe that's the reason @Dtown is looking if he qualifies for Special Enrollment so that he can at least purchase a health insurance. And to be clear, qualifying for Special Enrollment doesn't mean that you qualify for government assistance. It means that you can buy insurance for the current year.