| Country | Language | National Speaker Number | Bases for Calculation | Year | Source |
|---|---|---|---|---|---|
| Bulgaria | Bulgarian | 5 037 607 (given) | Mother Tongue | 2021 | |
| Greece | Bulgarian | 75 900 (based on nationality) | Users | 2011 | |
| Hungary | Bulgarian | 5 112 (given) | Spoken language | 2022 | |
| Romania | Bulgarian | 4 478 (given) | Mother Tongue | 2021 | |
| Serbia | Bulgarian | 7 939 (given) | Mother Tongue | 2022 | |
| Slovakia | Bulgarian | 907 (given) | Mother Tongue | 2021 |
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