===Adjacent counties===*Union County (north)*Franklin County (east)*Pickaway County (southeast)*Fayette County (south)*Greene County (southwest)*Clark County (west)*Champaign County (northwest)==Demographics==As of the census of 2000, there were 40,213 people, 13,672 households, and 10,035 families residing in the county.
* Франклин (Огайо) — восток* Файетт (Огайо) — юг* Кларк (Огайо) — западПо данным переписи населения 2000 года в округе проживает 40 213 жителей в составе 13 672 домашних хозяйств и 10 035 семей.