Coulter is located at . According to the United States Census Bureau, the city has a total area of, all land.
Demographics
2010 census
At the 2010 census there were 281 people, 107 households, and 76 families living in the city. The population density was. There were 117 housing units at an average density of. The racial makup of the city was 87.2% White, 0.4% African American, 12.1% from other races, and 0.4% from two or more races. Hispanic or Latino of any race were 14.9%. Of the 107 households 37.4% had children under the age of 18 living with them, 55.1% were married couplesliving together, 6.5% had a female householder with no husband present, 9.3% had a male householder with no wife present, and 29.0% were non-families. 26.2% of households were one person and 11.2% were one person aged 65 or older. The average household size was 2.63 and the average family size was 3.12. The median agewas 34.5 years. 29.5% of residents were under the age of 18; 8% were between the ages of 18 and 24; 24.6% were from 25 to 44; 27.3% were from 45 to 64; and 10.7% were 65 or older. The gender makeup of the city was 55.2% male and 44.8% female.
At the 2000 census there were 262 people, 105 households, and 66 families living in the city. The population density was 106.8 people per square mile. There were 118 housing units at an average density of 48.1 per square mile. The racial makup of the city was 96.18% White, 3.82% from other races. Hispanic or Latino of any race were 4.20%. Of the 105 households 29.5% had children under the age of 18 living with them, 51.4% were married couples living together, 8.6% had a female householder with no husband present, and 37.1% were non-families. 27.6% of households were one person and 9.5% were one person aged 65 or older. The average household size was 2.50 and the average family size was 3.14. The age distribution was 27.9% under the age of 18, 7.6% from 18 to 24, 26.3% from 25 to 44, 20.6% from 45 to 64, and 17.6% 65 or older. The median age was 37 years. For every 100 females, there were 114.8 males. For every 100 females age 18 and over, there were 110.0 males. The median household income was $35,208 and the median family income was $38,958. Males had a median income of $26,538 versus $20,625 for females. The per capita income for the city was $14,056. About 13.4% of families and 18.4% of the population were below the poverty line, including 36.3% of those under the age of eighteen and none of those sixty five or over.
