In 2018 the total municipality population reached 502.
51.1 percent of the population had at least a high school diploma or the equivalent. The table below shows how many Arjay residents who were at least 25 years old in 2018 held each of the listed degrees.
Degree distribution in Arjay for 2018*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 136 | 48.9 |
| Regular high school diploma | 131 | 47.1 |
| GED or alternative credential | 0 | 0 |
| Some college, less than 1 year | 11 | 4 |
| Some college, 1 or more years, no degree | 0 | 0 |
| Associate's degree | 0 | 0 |
| Bachelor's degree | 0 | 0 |
| Master's degree | 0 | 0 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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