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Chromosome numbers are reported for 67 individuals of 13 species of <i>Solidago</i> sect. <i>Erectae</i>, <i>S.</i> sect. <i>Squarrosae</i>, and <i>S.</i> sect. <i>Villosicarpae</i> from 65 locations in eastern Canada and the eastern United States: <i>S. bicolor</i>, <i>S. erecta</i>, <i>S. hispida</i>, <i>S. jejunifolia</i>, <i>S. pallida</i>, <i>S. puberula</i>, <i>S. pulverulenta</i>, <i>S. rigidiuscula</i>, <i>S. roanensis</i>, <i>S. sciaphila</i>, <i>S. speciosa</i>, <i>S. squarrosa</i>, and <i>S. villosicarpa</i>. Cytogeography maps based on new reports and all 258 previously published reports from 230 locations for the three sections plus <i>S.</i> sect. <i>Brintonia</i> (<i>S. discoidea</i>) are presented for 20 of the 30 species in the four closely related sections. The following are either first documented reports for the taxon or just first counts for a taxon from particular provinces and states: <i>Solidago bicolor</i>, 2<i>n</i> = 18 from Nova Scotia and Prince Edward Island; <i>S. hispida</i> var. <i>hispida</i>, 2<i>n</i> = 18 from New Hampshire, New Brunswick, and Wisconsin; <i>S. jejunifolia</i>, 2<i>n</i> = 18 from Michigan and Minnesota; <i>S. pallida</i>, 2<i>n</i> = 18 from Wyoming; <i>S. puberula</i>, 2<i>n</i> = 18 from Pennsylvania, Prince Edward Island, and Virginia; and first reports for <i>S. sciaphila</i>, 2<i>n</i> = 36 from Iowa, Illinois, and Wisconsin.