Here is a link for information on the counties for Iowa that are from the past to the present time. There is also other information that you may find interesting. http://www.raogk.org/iowa-genealogy/ia-counties/
This next link is for the counties in Iowa and then you can click on the county to take you to other links for the county. http://www.iowadot.gov/maps/msp/pdfview/counties.html
Iowa Department of Veteran Affairs website giving information on the services for veteran affairs for each county in Iowa
https://va.iowa.gov/counties
Travel Iowa link with lots of things to see, do and find
http://www.traveliowa.com