only use one data source
Right now you have cities over 65,000 under the new ACS 2021 1-year data, and all others under the ACS 2020 5-year data. Unfortunately, these are two separate data sources so for statistical analysis, it's improper to compare, say, Cleveland with adjacent smaller suburbs. The database mixes them up, but I would keep ACS 2020 5-year until the 2017-2021 ACS 5-year Estimates come out in December and then switch to that, so that all census data is sourcing from the same estimates.

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Thanks for this suggestion. Note that the Census Bureau also recommends against comparing 1-year and 5-year releases which have the same end year, since the pool of data is different.
If you choose a data table which includes some geographies that are only in the 5-year, Census Reporter should use the 5-year estimates for all geographies, even those which may also be in the one year: for example, table B01003 for all places in Cuyahoga County: https://censusreporter.org/data/table/?table=B01003&geo_ids=160|05000US39035&primary_geo_id=05000US39035
Since this one already has 3 votes even though it was only opened yesterday, we'd be happy to hear more if folks disagree or just don't understand.