Consider the
Kenosha Steambaths, which according to its
web site was originally built in 1926.
There was a time - late 1800s, early 1900s - in US cities when many working class and poor people lived in housing that didn't have bathing facilities. I remember an article about baths in Chicago (or was it Cleveland? An industrial city with a large immigrant population...). There were many such establishments. They had separate hours for men and for women; children might have been included in the womens' hours, though I don't recall.
The Kenosha facility is one of a very few still remaining from this era. It is, in fact, open to men, women, and children athough it has a men-only section. Befitting Wisconsin, it has authentic Finnish saunas too.