* Hausa is the official language of Niger alongside French. This signifies its widespread use.
* According to Ethnologue, Hausa is spoken by roughly 69% of Niger's population. This is a significant majority, but keep in mind that Ethnologue relies on estimates and may not be perfectly accurate.
Therefore, it's safe to say that a very large majority of Niger's population speaks Hausa, likely exceeding 60%. It's likely even higher, but a precise figure is unavailable.