Doctor, postmaster, clerk, and some pumpers and roustabouts with families.
This is the only 'pure oil' page from the ED that included 3 Sands. The rest are mostly farmers.
The town was about half in Kay County and half in Noble, mainly laid out along current US 77. (177 moved east.) I put together a map from the Census maps, which might be useful:
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A bit later: CORRECTION. No, the town wasn't peaking in '40. It peaked around '28, and the post office was closed in '42. So the census probably gave an accurate sense of the fading remnants.
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I've got three buildings so far, crammed together unrealistically here for scale checking. The school, a tenant cottage, and the main shop. All are fairly authentic based on available pix. (I'd already made the tenant cottage, a standard Aladdin unit, for an earlier set.)
The current icon shows Polistra using a Personal Equation Machine.