As of the census of 2010, there were 7,101 people, 2,893 households, and 1,865 families living in the city. The population density was. There were 3,137 housing units at an average density of. The racial makeup of the city was 97.5% White, 0.4% African American, 0.2% Native American, 0.2% Asian, 0.4% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 1.8% of the population. There were 2,893 households, of which 31.2% had children under the age of 18 living with them, 48.3% were married couples living together, 11.0% had a female householder with no husband present, 5.2% had a male householder with no wife present, and 35.5% were non-families. 29.9% of all households were made up of individuals, and 13.8% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 3.00. The median age in the city was 38.6 years. 24.6% of residents were under the age of 18; 8.8% were between the ages of 18 and 24; 23.8% were from 25 to 44; 25.5% were from 45 to 64; and 17.1% were 65 years of age or older. The gender makeup of the city was 48.6% male and 51.4% female.
2000 census
As of the census of 2000, there were 6,944 people, 2,717 households, and 1,880 families living in the city. The population density was 2,391.9 people per square mile. There were 2,906 housing units at an average density of 1,001.0 per square mile. The racial makeup of the city was 98.63% White, 0.27% African American, 0.14% Native American, 0.19% Asian, 0.24% from other races, and 0.52% from two or more races. Hispanic or Latino of any race were 0.76% of the population. There were 2,717 households, out of which 33.8% had children under the age of 18 living with them, 55.2% were married couples living together, 9.9% had a female householder with no husband present, and 30.8% were non-families. 27.2% of all households were made up of individuals, and 13.8% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.08. In the city, the population was spread out, with 26.8% under the age of 18, 9.6% from 18 to 24, 27.6% from 25 to 44, 19.6% from 45 to 64, and 16.4% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 95.9 males. For every 100 females age 18 and over, there were 88.6 males. The median income for a household in the city was $35,817, and the median income for a family was $44,385. Males had a median income of $32,917 versus $21,124 for females. The per capita income for the city was $16,380. About 5.6% of families and 6.8% of the population were below the poverty line, including 7.5% of those under age 18 and 6.6% of those age 65 or over.
Delphos City Parks include Stadium Park, Waterworks Park, Leisure Park, Garfield Park and Suever Park. Stadium Park is home to a football field where the Delphos Jefferson Wildcats and the St. Johns Blue Jays play. The Stadium was built in 1940 and has the capacity of 3900 people. Stadium Park also has multiple tennis courts, baseball fields, basketball courts, a playground, and eating area.
History
Delphos had its start in the early 1850s when the neighboring rival towns of East Bredeick and Howard merged. The city's name is derived from the Greek god Delphus. Three Delphos buildings are listed on the National Register of Historic Places: the Marks-Family House and St. John's Catholic Church on the Allen County side of the city, and the Bredeick-Lang House on the Van Wert County side.
