About 11.5 million people so far have enrolled in an Obamacare exchange-sold plan for 2016.
Officials also said the average per-person subsidy that's being issued to returning qualified HealthCare.gov customers for 2016 plans is $295 per month, which covers about 72 percent of their gross premiums.
Most returning HealthCare.gov customers, 83 percent, qualify for such financial aid to help reduce the cost of their monthly premiums. The subsidies are available to people with low or moderate household incomes, up to four times the federal poverty level.
The average premium for those customers after the subsidy is factored in is $113, according to the data released Thursday.
Officials said that almost 70 percent of the returning HealthCare.gov customers have the option of enrolling in a health plan that would cost them less than $75 per month after subsidies.
About 60 percent of customers could get a subsidized plan that would leave them owing less than $50 per month in premiums, according to data.