Delphi is located at. According to the 2010 census, Delphi has a total area of, all land.
Demographics
2010 census
At the 2010 census there were 2,893 people, 1,135 households, and 694 families living in the city. The population density was. There were 1,270 housing units at an average density of. The racial makeup of the city was 91.7% White, 0.4% African American, 0.2% Native American, 0.2% Asian, 5.5% from other races, and 1.9% from two or more races. Hispanic or Latino of any race were 11.3%. Of the 1,135 households 32.8% had children under the age of 18 living with them, 44.1% were married couples living together, 11.2% had a female householder with no husband present, 5.8% had a male householder with no wife present, and 38.9% were non-families. 33.1% of households were one person and 16.2% were one person aged 65 or older. The average household size was 2.46 and the average family size was 3.12. The median age was 37.5 years. 25.9% of residents were under the age of 18; 8.5% were between the ages of 18 and 24; 25.5% were from 25 to 44; 22.3% were from 45 to 64; and 18% were 65 or older. The gender makeup of the city was 47.9% male and 52.1% female.
At the 2000 census there were 3,015 people, 1,161 households, and 748 families living in the city. The population density was 1,179.3 people per square mile. There were 1,241 housing units at an average density of 485.4 per square mile. The racial makeup of the city was 92.57% White, 0.13% African American, 0.20% Native American, 0.27% Asian, 5.87% from other races, and 0.96% from two or more races. Hispanic or Latino of any race were 12.17%. Of the 1,161 households 31.1% had children under the age of 18 living with them, 52.0% were married couples living together, 7.6% had a female householder with no husband present, and 35.5% were non-families. 31.3% of households were one person and 17.1% were one person aged 65 or older. The average household size was 2.50 and the average family size was 3.13. The age distribution was 25.9% under the age of 18, 8.2% from 18 to 24, 29.6% from 25 to 44, 18.9% from 45 to 64, and 17.4% 65 or older. The median age was 35 years. For every 100 females, there were 96.7 males. For every 100 females age 18 and over, there were 90.9 males. The median household income was $34,388 and the median family income was $45,878. Males had a median income of $31,360 versus $18,575 for females. The per capita income for the city was $16,703. About 7.4% of families and 13.4% of the population were below the poverty line, including 21.9% of those under age 18 and 6.0% of those age 65 or over.