Marlin is a city in Falls County, Texas, United States. Its population was 5,462 at the 2020 census. Since 1851, it has been the county seat of …Marlin is a city in Falls County, Texas, United States. Its population was 5,462 at the 2020 census. Since 1851, it has been the county seat of Falls County. Marlin has been given the nickname "The Hot Mineral Water City of Texas" by the 76th Texas State Legislature. Mineral water was discovered there in 1892.
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