Indiana Counties by Population (2024)

The most populous counties in Indiana are Marion County with 968,460, Lake County at 500,598, Allen County with 394,545, Hamilton County at 371,645, and St. Joseph County with 272,848. You can get the most current Census population data for all 92 Indiana counties, sorted from the most populous counties in Indiana to the least, according to the 2023 Population Estimates Program.

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