English Translation
Such a thing cannot be found everywhere.
Google Ngrams has this to say about the frequency of en/por todos lados/todas partes:
en todas partes 0.0007681814%
por todos lados 0.0002012754%
en todos lados 0.0000673057%
por todas partes 0.0006509719%
Am I correct in supposing that they are all interchangeable?
Lados and partes are interchangeable, en and por aren’t. Often you could use either, but they still mean different things.
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Could you please give a couple of examples where they are not? My supposition was “interchangeable as a translation of everywhere”.
Corren por todas partes. They run around everywhere.
Corren en todas partes. They run everywhere. (This sounds awkward to me without context.)
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I’m happy to say that I agree
. So maybe en is used in a static context, and por in a possibly more dynamic one (with movement)?
Hmm I don’t think it’s anything subtle, just the difference between ‘aquí’ and ‘por aquí’.
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I have been thinking about it for a bit, and come up with this explanation (on this post) what do you think:
“en” is about individual spots, while “por” is rather about “zones”.
So, perhaps:
- I have searched under each cushion, in the cupboard, on the table : no lo he encontrado en ningún lado
- I have looked around in the kitchen, in the livingroom, in each corner of the house: no lo he encontrado por ningún lado.
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OT: Did I really post two similar questions in just two days? I must be losing it, please bear with me 
Anyway, that makes sense.
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