Infrastructure-wise, roads come before water or electricity, and so plenty of the United States has a road but no power or water. This can even be standard for those who are near civilization.
Slab City is 100 miles from San Diego and only 160 miles from Los Angeles! That's not remote - remote should be classified using a decreasing population density over distance function.
Remote is somewhere like Nullarbor, which is 183 miles from Ceduna (population < 6000). It's over 1000km to Adelaide (population 1.3m) or 1600km to Perth (population 1.9m).
I might be wrong but there are few places that already have population and yet require a week of travel via camel to get to.
My sister lived in Wingellina[1][2], Western Australia which was a 6 hour drive on unpaved, 4WD required track from Alice Springs. That's close to one of the most difficult, isolated places to get to in Australia, but even there isn't a week on Camels. Maybe going further west into the Great Sandy Desert might get close (although you get close to small townships in WA if you go too far).
The Empty Quarter has low population density but is smaller than isolated areas in Australia.
There are probably places in Siberia and Canada that are fairly isolated too.
I agree that there are more isolated islands. The Pitcairn Islands is the most obvious case.
The heck with camels. All these places are still within a few meters of the Earth's surface. If you want remote, you've got to think outside the biosphere!
When I was a teenager, we would wake up on a summer Saturday in country A, drive through the entirety of country B, and stop by in a lovely city in country C, all in 76km. With full double border crossings, changes in climate and culture and population, several different terrain types including some proper big mountains, and everything :)
Point is, yes USA is huge (let alone Australia) and skews our sense of distance, but 100 miles is not as trivial distance as we sometimes instinctively feel :-)
Heck, there's a difference between western (interstate super-slab) US and Eastern, Virginia like (Birth of a Nation two lane highway) roads.
I can leave Denver and be DEEP into Wyoming in 2 hours, or it can take 90 minutes to go 60 miles in Rural Virginia (80mph speed limit vs 60 mph speed limit)
It really depends on the reasoning for wanting to be remote.
Some people just love not having people around, in which case you really want low average weekly population density within say 5-10km (out of easy visibility and hearing).
Some people are concerned about civilization collapse or civil war or... something (ie, the prepper type). In that case you can imagine population dispersing away from (and possibly towards) major population centers over a period of months, and you want true isolation.
Not to mention Slab City: https://en.wikipedia.org/wiki/Slab_City,_California
Infrastructure-wise, roads come before water or electricity, and so plenty of the United States has a road but no power or water. This can even be standard for those who are near civilization.