The following is an excerpt from CountyHealthRankings.org

County Health Rankings and Roadmaps explain the connection between civic health and health HERE and also share a curated list of proven strategies. The following is an excerpt from their site:

People are more likely to participate in places with well-resourced civic infrastructure.⁵ Research shows that increased civic participation, such as voting and volunteering, is tied to better health, including improved public health outcomes, self-reported health, mental health and physical health.^6,7,8,9 The social connections made through participating in civic life can also increase length of life.¹⁰

Healthier counties have more available and better-resourced civic infrastructure, including access to information via broadband internet, libraries and local news outlets, and access to civic spaces, including adequately funded schools, parks, and social associations. Healthier counties also have higher rates of voter turnout and census participation than the least healthy counties. Counties that have a long history of disinvestment and discriminatory policies and practices, such as redlining and racial segregation, are consistently among the least healthy in measures of length and quality of life.⁵

Some states have more structural barriers to civic health, or policies and practices that maintain unfair and unjust outcomes. Examples include gerrymandered districts and laws and practices that make it harder to vote and encourage disinvestment in civic infrastructure. Voter turnout, census participation and volunteering rates are lowest in states with more structural barriers.⁵ There are also impacts on health and equity, including increased premature death rates, particularly among people with lower incomes.^11,12

Which strategies will improve civic health?  

Nurturing civic health requires individual actions in addition to local, state and federal solutions. Some strategies make it easier to participate in civic life, especially for people who have been excluded from making their voice heard in the past. Other strategies strengthen local ownership and community assets, invest in public spaces, nurture civic skills, and improve opportunities to work toward a common purpose. All of these strategies can build community power and contribute to healthier communities. 

Source: https://www.countyhealthrankings.org/strategies-and-solutions/what-works-for-health/curated-strategy-lists/about-the-civic-health-curated-strategy-list (footnotes available here as well)