| Official Name: | Lake Marshall 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: | Lyon |
| Unit Pref: | Imperial |
| Area Total Km2: | 77.6 |
| Area Land Km2: | 76.6 |
| Area Water Km2: | 1.0 |
| Area Total Sq Mi: | 30.0 |
| Area Land Sq Mi: | 29.6 |
| Area Water Sq Mi: | 0.4 |
| Population As Of: | 2000 |
| Population Total: | 517 |
| Population Density Km2: | 6.7 |
| Population Density Sq Mi: | 17.5 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation M: | 351 |
| Elevation Ft: | 1152 |
| Coordinates: | 44.4208°N -95.8014°W |
| Blank Name: | FIPS code |
| Blank Info: | 27-34712[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0664689[2] |
Lake Marshall Township is a township in Lyon County, Minnesota, United States. The population was 517 at the 2000 census.
Lake Marshall Township was organized in 1872, and named for Lake Marshall.[3]
According to the United States Census Bureau, the township has a total area of 30sqmi, of which 29.6sqmi is land and 0.4sqmi (1.30%) is water.
As of the census of 2000, there were 517 people, 183 households, and 144 families residing in the township. The population density was 17.5sp=usNaNsp=us. There were 193 housing units at an average density of 6.5sp=usNaNsp=us. The racial makeup of the township was 98.45% White, 0.19% African American, 0.77% Asian, 0.58% from other races. Hispanic or Latino of any race were 0.58% of the population.
There were 183 households, out of which 40.4% had children under the age of 18 living with them, 71.0% were married couples living together, 2.7% had a female householder with no husband present, and 20.8% were non-families. 15.3% of all households were made up of individuals, and 6.0% had someone living alone who was 65 years of age or older. The average household size was 2.83 and the average family size was 3.17.
In the township the population was spread out, with 30.6% under the age of 18, 6.6% from 18 to 24, 28.4% from 25 to 44, 28.2% from 45 to 64, and 6.2% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 104.3 males. For every 100 females age 18 and over, there were 108.7 males.
The median income for a household in the township was $56,607, and the median income for a family was $62,344. Males had a median income of $38,333 versus $25,769 for females. The per capita income for the township was $21,461. About 1.4% of families and 4.1% of the population were below the poverty line, including 1.8% of those under age 18 and 12.1% of those age 65 or over.