Health Indicators Warehouse (variety of health indicators, from food safety to infectious disease to LGBT health statistics): https://www.healthdata.gov/
Community Commons (mapping and report building site with information on health equity, economic factors, education, food security, and health status): http://www.communitycommons.org/
Iowa Department of Health and Human Services, Vital Statistics (county-level data on vital events - births, deaths, diseases prevalence): https://hhs.iowa.gov/health-statistics