Begin by going to Find Interventions that Work, and use the "Select the settings" filter on the left under the heading "Limit results to interventions implemented: In urban or rural settings."
If you select "Rural only", the search will return interventions that have only been tested in rural settings plus those that have been tested in multiple studies and at least one of those studies occurred in an exclusively rural setting.
However, consider expanding your search to include interventions that were tested in multiple settings; a category that can include rural settings. Some interventions may have been tested and implemented in rural settings, but the study findings were not disaggregated by rural versus non-rural settings, so they will not be included in the "Rural only" search results. For example, a study may have tested an intervention throughout the state of Texas, which includes rural, urban, and suburban areas. To capture interventions like these, expand your search to include "Tested in multiple settings." This will provide a more comprehensive list of interventions relevant to rural settings.