| Kirby - Educational Attainment | FIPS Code=05030 |
| 1970 | 1980 | 1990 | |
| Per Cent of Individuals Ages 25 and Older without a High School Diploma | 56.35 | 24.50 | 17.20 |
| Per Cent of Individuals Ages 25 and Older with a High School Diploma or Equivalent | 30.95 | 35.20 | 44.40 |
| Per Cent of Individuals Ages 25 and Older with a Bachelor's Degree or Some College | 8.73 | 18.90 | 24.70 |
| Per Cent of Individuals Ages 25 and Older with a Doctorate, Professional or Master's Degree | 3.97 | 21.40 | 13.80 |