Doniphan is a city in Ripley County, Missouri, United States. The population was 1,781 at the 2020 census. It is the county seat of Ripl…Doniphan is a city in Ripley County, Missouri, United States. The population was 1,781 at the 2020 census. It is the county seat of Ripley County. The first settlement at Doniphan was made in the 1840s. The community was named for Alexander William Doniphan. A post office called Doniphan has been in operation since 1848.
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