sikkim.org.in
sikkim.net.in
mizoram.org.in
meghalaya.org.in
meghalaya.net.in
himachalpradesh.org.in
haryana.org.in
manipur.org.in
tripura.net.in
tripura.org.in

Remember: The Indian Domain Registry has reserved the use of state names with the .in extension. Apart from .co.in, these are the best state names available.