For late EMH I've seen Electric Umbrella open (not always until the last hours though) and Sunshine Seasons in the Land. Only certain counters open late at Sunshine Seasons, not every station.
At the countries CS closes at normal park closing time at the start of Illuminations. A few times during periods of heavy crowds a couple of places may stay open for an extra hour or so, but never seen the countries CS open until the end.
Best to check the Times Guide for that night, since what is open can vary.