| Cornwall - Educational Attainment | FIPS Code=1020 |
| 1970 | 1980 | 1990 | |
| Per Cent of Individuals Ages 25 and Older without a High School Diploma | 39.52 | 28.4 | 13.3 |
| Per Cent of Individuals Ages 25 and Older with a High School Diploma or Equivalent | 25.55 | 27 | 29.9 |
| Per Cent of Individuals Ages 25 and Older with a Bachelor's Degree or Some College | 12.18 | 13.2 | 18.4 |
| Per Cent of Individuals Ages 25 and Older with a Doctorate, Professional or Master's Degree | 22.75 | 31.4 | 38.3 |