Resident Population in Miami-Dade County, FL was 2802.02900 Thous. of Persons in January of 2025, according to the United States Federal Reserve. Historically, Resident Population in Miami-Dade County, FL reached a record high of 2838.46100 in January of 2024 and a record low of 1267.79200 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Miami-Dade County, FL - last updated from the United States Federal Reserve on June of 2026.