| Official Name: | Decker, Indiana |
| Settlement Type: | Town |
| Mapsize: | 250x200px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Knox |
| Subdivision Type3: | Township |
| Subdivision Name3: | Johnson |
| Population As Of: | 2020 |
| Population Total: | 199 |
| Population Density Sq Mi: | 1099.45 |
| Population Density Km2: | 425.50 |
| Timezone: | EST |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Area Land Km2: | 0.47 |
| Area Water Km2: | 0.00 |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.47 |
| Area Total Sq Mi: | 0.18 |
| Area Land Sq Mi: | 0.18 |
| Area Water Sq Mi: | 0.00 |
| Elevation M: | 142 |
| Elevation Ft: | 466 |
| Coordinates: | 38.5183°N -87.5239°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 47524 |
| Area Code: | 812 |
| Blank Name: | FIPS code |
| Blank Info: | 18-17110[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0433402[3] |
| Unit Pref: | Imperial |
Decker is a town in Johnson Township, Knox County, Indiana, United States. The population was 249 at the 2010 census. It was founded in 1869 by Isaac Decker.[4] Decker is near the White River, and is well known for the watermelon and cantaloupe produced in the surrounding rural area.
Decker is located at 38.5183°N -87.5239°W (38.518391, -87.523814).[5]
According to the 2010 census, Decker has a total area of 0.18sqmi, all land.[6]
At the 2010 census,[7] there were 249 people, 92 households and 68 families living in the town. The population density was 1383.3/sqmi. There were 109 housing units at an average density of 605.6/sqmi. The racial make-up of the town was 97.6% White, 1.2% African American, 0.8% Asian and 0.4% from two or more races.
There were 92 households, of which 33.7% had children under the age of 18 living with them, 63.0% were married couples living together, 8.7% had a female householder with no husband present, 2.2% had a male householder with no wife present and 26.1% were non-families. 20.7% of all households were made up of individuals and 8.7% had someone living alone who was 65 years of age or older. The average household size was 2.71 and the average family size was 3.16.
The median age was 39.3 years. 24.9% of residents were under the age of 18, 8.7% were between the ages of 18 and 24, 22.8% were from 25 to 44, 30.4% were from 45 to 64 and 12.9% were 65 years of age or older. The sex make-up of the town was 52.2% male and 47.8% female.
At the 2000 census,[8] there were 283 people, 107 households and 80 families living in the town. The population density was 1081sp=usNaNsp=us. There were 120 housing units at an average density of 458.4sp=usNaNsp=us. The racial mak-eup of the town was 99.65% White and 0.35% from other races. Hispanic or Latino of any race were 0.35% of the population.
There were 107 households, of which 33.6% had children under the age of 18 living with them, 51.4% were married couples living together, 15.9% had a female householder with no husband present and 24.3% were non-families. 23.4% of all households were made up of individuals and 11.2% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.05.
28.6% of the population were under the age of 18, 10.2% from 18 to 24, 24.7% from 25 to 44, 21.6% from 45 to 64 and 14.8% were 65 years of age or older. The median age was 37 years. For every 100 females, there were 106.6 males. For every 100 females age 18 and over, there were 94.2 males.
The median household income was $24,821 and the median family income was $28,750. Males had a median income of $25,000 and females $15,714. The per capita income was $15,482. About 14.3% of families and 21.3% of the population were below the poverty line, including 26.7% of those under the age of eighteen and 20.6% of those 65 or over.
The school at Decker provided all grades until 1967, when the middle and high school grades were consolidated into South Knox High School. The school continued to provide grades K-5 until 1999, when those grades were also consolidated. The school mascot was the "Aces", which originally referred to wartime airplane pilots, and later to the aces in playing cards. The old high school building was struck by lightning, and subsequently destroyed by fire on July 9, 2024.