| Country | Language | National Speaker Number | Bases for Calculation | Year | Source |
|---|---|---|---|---|---|
| Czech Republic | Lower Silesian | 22 900 (international) | Speakers | 2026 (Website accessed) | |
| Czech Republic | Lower Silesian | 10 900 | Users | 2001 | |
| Germany | Lower Silesian | 22 9000 (international) | Speakers | 2026 (Website accessed) | |
| Poland | Lower Silesian | 22 9000 (international) | Speakers | 2026 (Website accessed) | |
| Poland | Lower Silesian | 12 000 | Users | / |
| Country | Language | Endangerment Level | Source |
|---|---|---|---|
| Czech Republic | Lower Silesian | Vulnerable | |
| Czech Republic | Lower Silesian | 6a* (Vigorous) | |
| Germany | Lower Silesian | Vulnerable | |
| Poland | Lower Silesian | Vulnerable | |
| Poland | Lower Silesian | 6a* (Vigorous) |
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