This was 29.3 percent lower than the state average of 43.2 percent. In 2020 the total municipality population reached 172.
62.6 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Haigler for 2020*
| Degree | Number of people | Percentage of population | 
|---|---|---|
| No degree | 43 | 37.4 | 
| Regular high school diploma | 14 | 12.2 | 
| GED or alternative credential | 2 | 1.7 | 
| Some college, less than 1 year | 15 | 13 | 
| Some college, 1 or more years, no degree | 25 | 21.7 | 
| Associate's degree | 6 | 5.2 | 
| Bachelor's degree | 5 | 4.3 | 
| Master's degree | 5 | 4.3 | 
| Professional school degree | 0 | 0 | 
| Doctorate degree | 0 | 0 | 

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