The top 10 oil-producing states in Nigeria, listed based on their oil production levels, are as follows:

1. Akwa Ibom – Known for producing a significant portion of Nigeria’s oil output.
2. Rivers – Home to major oil fields and refineries.
3. Delta – Another major oil-producing state with abundant oil reserves.
4. Bayelsa – Rich in oil reserves, contributing significantly to national output.
5. Ondo – Has offshore and onshore oil fields, especially in the Ilaje area.
6. Edo – Produces oil mainly from its onshore fields.
7. Imo – Known for smaller but significant oil fields.
8. Abia – Produces oil primarily in the Ukwa West area.
9. Lagos – Has offshore oil production contributing to the state’s revenue.
10. Anambra – A recent addition to oil-producing states, with small but growing production levels.

These states are primarily in the Niger Delta region, which has been central to Nigeria’s oil industry.