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About 476,000 Obamacare applications filed: Sources

Obama administration officials say about 476,000 health insurance applications have been filed through new "Obamacare" exchanges.

That's the most detailed measure yet of the problem-plagued rollout of President Barack Obama's signature legislation.

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However, the officials continue to refuse to say how many people have actually enrolled in the insurance markets.

(Read more: Obamacare: Contract for troubled site swells)

Without enrollment figures, it's unclear whether the program is on track to reach the 7 million people projected by the Congressional Budget Office to gain coverage during the six-month sign-up period.

The officials did not want to be cited by name and would not discuss the health insurance rollout unless they were granted anonymity.