Americans might be down on Congress — which has a 20% approval rating — and on the government in general, but we're apparently feeling pretty good about our federal agencies, with the folks who deliver our mail being at the top of the list.

Almost three-quarters of Americans give the U.S. Postal Service (USPS) a thumbs up, according to Gallup. Seventy-four percent of respondents say the postal service is going a "good" or "excellent" job.

After the post office, the departments and agencies drawing the highest approval are the Secret Service, Centers for Disease Control (CDC), CIA, NASA, and the FBI.