The free public data files identified on their download pages as CC0, including cities.csv and anonymous filtered exports derived from it, are released under CC0 (public domain dedication). You can copy them, transform them, redistribute them, and build on them without asking permission and without paying a fee.
Every original map published by Every City in the USA is licensed under Creative Commons Attribution 4.0 unless its page or file says otherwise. This includes map-builder output, ready-made state and national maps, Growth Atlas maps, the homepage coverage map, and city locator maps. Original graphics explicitly marked CC BY 4.0 use the same terms. You may copy, adapt, publish, and use this work commercially.
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The underlying Census source data is also public domain under 17 U.S.C. § 105. Attribution is appreciated but not required. If you do cite a source for the data, use https://www.everycityintheusa.com/sources/ for the full methodology and provenance chain.