Not as up-to-date as the Iowa Data Center Moratorium spreadsheet, but info from across the nation
Three sites that have either been discussed or look as though they would be quite attractive
A ChatGPT Field Guide to the characteristics of sites that attract data center developers
And the Marshalltown Zoning Map, in case you want to think creatively about what could be possible.
Data centers will probably be limited to Industrial zones (the purple parts of town).