The map below was created by the US Department of Health and Human Services (HHS), it shows percentage of people without health insurance for every county in the country. The upper Midwest and parts of the Northeast stand out as a places with low numbers of uninsured, and counties with high numbers of uninsured stand out in parts of the Southwest and sporadically in the West.
Zoom into Iowa and you can find the number in your county.
The most interesting thing about this map is the line you can make out dividing Iowa and Missouri. The two other maps that HHS created suggest demographics and income as partial causes of people being uninsured. Looking at those other two maps (click on the tabs at the top of the map on the original page) there is little difference between counties on either side of the Iowa/Missouri boarder, but for some reason the counties on the Iowa side have lower rates of the uninsured.