Delphos is located at 40°50'56" North, 84°20'33" West (40.84895-84.34267).
As of the 2000 census, there are 2,759 households, and 1,935 families residing and 824 non-family residents in the city.
There are 6,526 housing units at an average density of 256.9/km² (665.5/mi²).
The racial makeup of the city is 99.1% White, 0.5% African American, 0..3% Native American, 0.3% Asian, 0.03% and 0.3% from other races.
There are 2,759 households out of which 33.8.3% have children under the age of 18 living with them, 55.2% are married couples living together, 9.9% have a female householder with no husband present, and 42.2% are non-families. 30.8% of all households are made up of individuals and 13.85% have someone living alone who is 65 years of age or older.
The average household size is 2.5 and the average family size is 2.6.
In the city, the population is spread out with 68.7.6% over the age of 21, 18.60% over the age of 62 and 16.4% over the age of 65. The median age is 35.5 years.
The median income for a household in the city is $35,817, and the median income for a family is $44,385. Males have a median income of $32,917 versus $21,124 for females. The per capita income for the city is $16,380.