| Official Name: | Jay Township, Minnesota |
| Settlement Type: | Township |
| Pushpin Map: | Minnesota#USA |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location within the state of Minnesota |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Minnesota |
| Subdivision Type2: | County |
| Subdivision Name2: | Martin |
| Unit Pref: | Imperial |
| Area Total Km2: | 93.9 |
| Area Land Km2: | 93.9 |
| Area Water Km2: | 0.0 |
| Area Total Sq Mi: | 36.3 |
| Area Land Sq Mi: | 36.3 |
| Area Water Sq Mi: | 0.0 |
| Population As Of: | 2000 |
| Population Total: | 269 |
| Population Density Km2: | 2.9 |
| Population Density Sq Mi: | 7.4 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation M: | 403 |
| Elevation Ft: | 1322 |
| Coordinates: | 43.6375°N -94.8039°W |
| Blank Name: | FIPS code |
| Blank Info: | 27-31778[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0664576[2] |
Jay Township is a township in Martin County, Minnesota, United States. The population was 269 at the 2000 census.
Jay Township was organized in 1872, and named for John Jay (1745–1829), American politician and jurist.[3]
According to the United States Census Bureau, the township has a total area of 36.3sqmi, of which 36.3sqmi is land and 0.03% is water.
As of the census of 2000, there were 269 people, 97 households, and 80 families residing in the township. The population density was 7.4sp=usNaNsp=us. There were 105 housing units at an average density of 2.9sp=usNaNsp=us. The racial makeup of the township was 97.77% White, 0.37% Asian, 0.74% from other races, and 1.12% from two or more races. Hispanic or Latino of any race were 1.12% of the population.
There were 97 households, out of which 36.1% had children under the age of 18 living with them, 77.3% were married couples living together, 4.1% had a female householder with no husband present, and 16.5% were non-families. 14.4% of all households were made up of individuals, and 7.2% had someone living alone who was 65 years of age or older. The average household size was 2.77 and the average family size was 3.06.
In the township the population was spread out, with 30.5% under the age of 18, 6.7% from 18 to 24, 24.5% from 25 to 44, 22.3% from 45 to 64, and 16.0% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 97.8 males. For every 100 females age 18 and over, there were 114.9 males.
The median income for a household in the township was $37,500, and the median income for a family was $39,688. Males had a median income of $30,385 versus $21,667 for females. The per capita income for the township was $16,381. About 10.1% of families and 8.2% of the population were below the poverty line, including 1.3% of those under the age of eighteen and 17.4% of those 65 or over.