It was organised by enumeration districts. If you look at the header on Scotland's People there's a description of the area and it should list streets/ villages/ farms in that district.
https://www.scotlandspeople.gov.uk/help-and-support/guides/census-returns#Description_enumeration_district
https://www.scotlandspeople.gov.uk/help-and-support/guides/census-returns#Description_enumeration_district
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https://thepastandotherplaces.wordpress.com/2023/02/12/1921the-case-of-the-missing-ancestors/