Resident Population in Johnstown, PA (MSA) was 128.96800 Thous. of Persons in January of 2025, according to the United States Federal Reserve. Historically, Resident Population in Johnstown, PA (MSA) reached a record high of 152.24000 in January of 2000 and a record low of 128.96800 in January of 2025. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Johnstown, PA (MSA) - last updated from the United States Federal Reserve on June of 2026.