North Carolina has around ~975,000 residents enrolled in ACA exchange plans, 94% of whom are currently subsidized. I estimate they also have another ~37,000 unsubsidized off-exchange enrollees.
Mississippi has around ~338,000 residents enrolled in ACA exchange plans, 98% of whom are currently subsidized. I estimate they also have another ~14,000 unsubsidized off-exchange enrollees.
The District of Columbia has around ~15,000 residents enrolled in ACA exchange plans. Unlike most states where nearly all ACA exchange enrollees are subsidized, in DC only around 28% are due to the District having an unusually high income eligibility threshold for Medicaid (210%).
DC also has a unique requirement that ACA individual market plans can only be sold on their ACA exchange; I'm assuming perhaps 1,000 off-exchange enrollees regardless but officially I believe this should be pretty much zilch. With net attrition since January, however, it looks like the grand total is actually a bit below 14,000 District-wide.
Montana has around ~77,000 residents enrolled in ACA exchange plans, 89% of whom are currently subsidized. I estimate they also have another ~8,400 unsubsidized off-exchange enrollees.
Missouri has around ~417,000 residents enrolled in ACA exchange plans, 94% of whom are currently subsidized. I estimate they also have another ~3,600 unsubsidized off-exchange enrollees.
Louisiana has around ~293,000 residents enrolled in ACA exchange plans, 96% of whom are currently subsidized. I estimate they also have another ~13,000 unsubsidized off-exchange enrollees.
Maryland has around 247,000 residents enrolled in ACA exchange plans, 76% of whom are currently subsidized. I estimate they also have another ~73,000 unsubsidized off-exchange enrollees.
Michigan has around 531,000 residents enrolled in ACA exchange plans, 91% of whom are currently subsidized. I estimate they also have another ~64,000 unsubsidized off-exchange enrollees.
Massachusetts has around 390,000 residents enrolled in ACA exchange plans, 83% of whom are currently subsidized. I estimate they also have another ~27,000 unsubsidized off-exchange enrollees.
Maine has around 64,000 residents enrolled in ACA exchange plans, 85% of whom are currently subsidized. I estimate they also have another ~4,500 unsubsidized off-exchange enrollees.
Combined, that's around 70,000 people, although it could be somewhat lower due to net enrollment attrition since January.