[4] Miami County is part of the Dayton, OH Metropolitan Statistical Area.

[5] As of the census[10] of 2000, there were 98,868 people, 38,437 households, and 27,943 families living in the county.

The racial makeup of the county was 95.78% White, 1.95% Black or African American, 0.19% Native American, 0.79% Asian, 0.01% Pacific Islander, 0.28% from other races, and 1.00% from two or more races.

23.20% of all households were made up of individuals, and 9.50% had someone living alone who was 65 years of age or older.

As of the 2010 United States census, there were 102,506 people, 40,917 households, and 28,626 families living in the county.

[11] In terms of ancestry, 34.5% were German, 13.5% were Irish, 10.2% were English, and 9.8% were American.

Miami County Court of Common Pleas Municipal Court The Western Ohio Japanese Language School (オハイオ西部日本語学校 Ohaio Seibu Nihongo Gakkō) is a supplementary weekend Japanese school in unincorporated Miami County, near Troy.