In 2020 the total municipality population reached 326.
85.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Newcastle for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 46 | 14.1 |
| Regular high school diploma | 75 | 23 |
| GED or alternative credential | 4 | 1.2 |
| Some college, less than 1 year | 76 | 23.3 |
| Some college, 1 or more years, no degree | 125 | 38.3 |
| 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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