Special Report

The Oldest County in Every State

Methodology

To determine the oldest county in each state, 24/7 Wall St. reviewed five-year data on median age from the U.S. Census Bureau’s 2019 American Community Survey. Counties were ranked based on the median age for all residents. In the case of a tie, the county where the largest share of the population are 65 or older ranked as the oldest.

Supplemental data on the share of the population under 18 years old and total population also came from the 2019 ACS and are five-year estimates. Data on life expectancy by county came from the 2020 County Health Rankings & Roadmaps, a joint program of the Robert Wood Johnson Foundation and University of Wisconsin Population Health Institute.

Data on population and place boundaries used to determine the largest city in every county came from the Census Bureau.