How many bodies are on Everest? And will they ever decay?

Not necessarily. If a body is at sufficiently high altitude, “just walking up to it” may be possible, but extremely difficult. When just putting one foot in front of the other requires concentrated effort; moving a 100kg dead weight is not really feasible.

I was referring to the story about finding a body somewhere in the contiguous 48 states, not the Himalayas.

There was a plane crash on Mount Rainier in 1946. Authorities knew the locations of the wreckage and (most of) the bodies, but did not recover those bodies:

That’s why if you falter high on an Everest summit push, like above Camp IV on the South Col route, you might as well be on the moon. There won’t be any cavalry coming to save you.

32 Marines died on Mount Rainier that day.

ETA:

Mr. Draper’s not in the office right now. May I take a message?
(Cooper almost certainly went into the Columbia River and drowned.)

So if I went to Mount Rainier right now could I find the crash site and bodies?

Not likely at this time. As the article noted, the crash debris and bodies would have become entombed within the glacier in the months/years after the crash as more and more snow fell on them and became compacted into glacial ice. But the glacier has been moving downhill since then, with the toe of the glacier melting away as more snow falls on it up at the top end. So one of these days the crash debris is expected to emerge at the bottom end of the glacier.

Spoilered for exceptional bad taste.

[ “Marines… FALL OUT!” ]

I laughed.

Exceptional? OK pretty good.

According to the article (published March 2000),

So you might stumble upon pieces and yet not know what they are.

Mostly intact corpses of of Italian and Austro-Hungarian soldiers from 100 years ago are emerging from receding glaciers due to climate change. There’s a little museum in Vicenza where the contents of their pockets are on display.