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Website. www .co .allen .in .us. Indiana county number 2. Largest county in Indiana by area. Third largest county in Indiana by population. Allen County is a county in Indiana. Its county seat is Fort Wayne .
Apr 10, 2024 · Allen County's population increased 12 out of the 12 years between year 2010 and year 2022. Its largest annual population increase was 1.9% between 2019 and 2020. Between 2010 and 2022, the county grew by an average of 0.8% per year.
Allen County, Indiana. Allen County, Indiana has 657.2 square miles of land area and is the 1st largest county in Indiana by total area.