Resident Population in Dubuque County, IA was 98.88700 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Dubuque County, IA reached a record high of 99.29100 in January of 2020 and a record low of 86.46200 in January of 1990. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Dubuque County, IA - last updated from the United States Federal Reserve on May of 2024.