This is the total number of membership associations in a county divided by the population of the county. The associations include membership organizations such as civic organizations, bowling centers, golf clubs, fitness centers, sports organizations, religious organizations, political organizations, labor organizations, business organizations, and professional organizations. These associations are identified by NAICS codes 813410, 713950, 713910, 713940, 711211, 813110, 813940, 813930, 813910, and 813920.

https://www.countyhealthrankings.org/explore-health-rankings/county-health-rankings-model/health-factors/social-economic-factors/family-and-social-support/social-associations?year=2022

https://www.census.gov/programs-surveys/cbp.html