| Calais - Educational Attainment | FIPS Code=23025 |
| 1970 | 1980 | 1990 | |
| Per Cent of Individuals Ages 25 and Older without a High School Diploma | 61.22 | 20.10 | 12.70 |
| Per Cent of Individuals Ages 25 and Older with a High School Diploma or Equivalent | 30.95 | 33.30 | 31.60 |
| Per Cent of Individuals Ages 25 and Older with a Bachelor's Degree or Some College | 4.08 | 13.50 | 21.80 |
| Per Cent of Individuals Ages 25 and Older with a Doctorate, Professional or Master's Degree | 3.74 | 33.10 | 33.80 |