The population growth in southwestern Butler County is leaving some of the area’s boroughs feeling squeezed as a result.

For example, Zelienople is bordered by Jackson Township to its north, southeast and south and the borough of Harmony to the northeast. The western border of the borough is the Beaver County line.

Tom Oliverio, who has been the borough’s mayor since 1990, said of Zelienople: “It’s like a croissant. We’ve got Jackson Township to the north, east and south. The rest is Beaver County.”

There’s no ability to expand or annex land, Oliverio said, leaving the borough to embrace a future very different from that of the expanding townships in the same southwestern corner of Butler County as Zelienople.

Oliverio said there’s a new subdivision on Route 68 on the west side of Zeli

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