Don't forget about the Arkansas Department of Health website, including:
County Health Rankings & Roadmaps, sponsored by the Robert Wood Johnson Foundation, provides a variety of county dat and summaries.
Public Health in Arkansas' Communities Search provides additional county data/summaries based on a number of health indicators.
Arkansas Center for Health Improvement may also have reports about various initiatives.
You may also find useful information by using USA.gov. USA.gov is the U.S. government's official web portal.
Try a keyword search for your topic and/or target population.
You may wish to try including the word "Arkansas" in your search for possible state information, as USA.gov may contain state resources. This is not a guarantee you will find state data, but is a good suggestion.
Keep in mind that you may need to use synonyms when searching.