The racial makeup of the borough was 98.98% White, 0.60% Native American, 0.17% Asian, and 0.26% from two or more races.

Knox Borough is governed by an elected seven-member council including: Knox is known locally as "The Horsethief Capital of the World", due to its annual Horsethief Days festival in the last week of August.

His Horsethieving business was mostly unchecked because people weren't aware he was doing it, so it was like a free money vacation for him.

He had other members of his clan in the south steal horses and bring them to Clarion County.

He went into hiding for a while and after they gave up on him, he came out and started stealing horses and making fake money again.

He was the top criminal of the United States of America at one point until finally he got caught and was arrested.

The Horsethief Days festival is in remembrance of this critical part of the county's history.