Etna is a borough in Allegheny County, Pennsylvania, United States. It is located at the mouth of Pine Creek on the Allegheny River, directly across from Pittsburgh. As of the 2020 census, Etna had a

Allegheny County is a large urban county in Pennsylvania, United States. As of the 2025 census estimate, the population was 1,225,035, a 2% decrease of 25,543 residents since 2020, making it the state