The Census, conducted every 5 years, is sent to domestic ACS members that are not: students, internationally-based, emeritus, or over 70 years old. Of our ~current membership of 157,000, only 73,000 members were contacted for the ChemCensus. For those of us keeping score that is less than 50% of our membership (all numbers are rounded, 72977 was the actual number.)
The percentage of ACS members in academia is now at 38%, up from 24% in 2004. The percentage of Industry (manufacturing*) ACS members is 42%, down from 54% in 2004. The % in industry (non-manufacturing, govt and self employed) has remained relatively flat over the decade at 12%, 7% and 2% respectively.
The ChemCensus response was about 24,000, or ~33%.
ACS has an 84% retention rate; with a churn of ~25,000 members not renewing (a few hundred die every year). Half of that 25K is students, we are told.