Only 26,794 have been able to sign up through the federal health insurance exchange in its first month.

These come from the 36 states that are not running their own exchanges. There are also 79,391 who have signed up using the 15 exchanges set up by the remaining states and the District of Columbia.

The numbers represent a fraction of the half-million health-plan enrollees that the Obama administration had initially projected, before the HealthCare.gov Web site’s rocky rollout thwarted many shoppers’ attempts to sign up for insurance. Budget forecasters previously projected that 7 million people would enroll in coverage during the open enrollment period for the insurance exchanges, which runs until March 31.