Resident Population in Kenai Peninsula Borough, AK was 61.95100 Thous. of Persons in January of 2025, according to the United States Federal Reserve. Historically, Resident Population in Kenai Peninsula Borough, AK reached a record high of 61.95100 in January of 2025 and a record low of 15.90000 in January of 1973. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Kenai Peninsula Borough, AK - last updated from the United States Federal Reserve on May of 2026.