| Clarendon - Educational Attainment | FIPS Code=21025 |
| 1970 | 1980 | 1990 | |
| Per Cent of Individuals Ages 25 and Older without a High School Diploma | 54.74 | 33.20 | 19.70 |
| Per Cent of Individuals Ages 25 and Older with a High School Diploma or Equivalent | 26.82 | 41.40 | 43.70 |
| Per Cent of Individuals Ages 25 and Older with a Bachelor's Degree or Some College | 13.19 | 13.70 | 19.30 |
| Per Cent of Individuals Ages 25 and Older with a Doctorate, Professional or Master's Degree | 5.23 | 11.70 | 17.30 |