WASHINGTON — With new health insurance markets launching next week, the Obama administration is unveiling premiums and plan choices for 36 states where the federal government is taking the lead to cover uninsured residents.

Before tax credits that work like an upfront discount for most consumers, sticker-price premiums for a midrange benchmark plan will average $328 a month nationally for an individual, comparable to payments for a new car.

The overview of premiums and plan choices, released today by Health and Human Services Secretary Kathleen Sebelius, comes as the White House swings into full campaign mode to promote the benefits of the Affordable Care Act to a skeptical public.

Sebelius stressed the positive in a preview call with reporters. Consumers will be able to choose from an average of 53 plan options when the new markets open Oct. 1 for people who don’t have health care on the job.

“For millions of Americans, these new options will finally make health insurance work within their budgets,” she said.

A report by her department estimated that about 95 percent of consumers will have two or more insurers to choose from. And the administration says premiums will generally be lower than what congressional budget experts estimated when the legislation was being debated.

Where you live, the plan you pick, family size, age, tax credits based on your income, and even tobacco use will all impact the bottom line. All those variables could make the system hard to navigate.

For example, the average individual premium for a benchmark policy known as the “second-lowest cost silver plan” ranges from a low of $192 in Minnesota to a high of $516 in Wyoming. That’s the sticker price, before tax credits.

In the three states with the highest uninsured population, the benchmark plan will average $373 in California, $305 in Texas, and $328 in Florida. Differences between states can be due to the number of insurers competing and other factors.

Consumers can pick from four levels of coverage, from bronze to platinum. All the plans cover the same benefits and cap annual out-of-pocket expenses at $6,350 for an individual, $12,700 for families.

The big difference is cost sharing through annual deductibles and copayments. Bronze covers 60 percent of expected costs; silver, 70 percent, on up to platinum at 90 percent. Bronze plans have the lowest premiums and the highest cost sharing.

The administration report found that factoring in tax credits, a 27-year-old making $25,000 a year would see the premium for the benchmark silver plan drop to $145 in nearly every state. But if that hypothetical young adult used the tax credit to buy the cheapest bronze plan, he or she could cut the monthly premium to $74 in the Dallas-Fort Worth area, $102 in Orlando, and $119 in Pittsburgh.