| Official Name: | Lake Mary 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: | Douglas |
| Unit Pref: | Imperial |
| Area Total Km2: | 91.1 |
| Area Land Km2: | 74.4 |
| Area Water Km2: | 16.7 |
| Area Total Sq Mi: | 35.2 |
| Area Land Sq Mi: | 28.7 |
| Area Water Sq Mi: | 6.5 |
| Population As Of: | 2000 |
| Population Total: | 997 |
| Population Density Km2: | 13.4 |
| Population Density Sq Mi: | 34.7 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation M: | 418 |
| Elevation Ft: | 1371 |
| Coordinates: | 45.8081°N -95.4514°W |
| Blank Name: | FIPS code |
| Blank Info: | 27-34730[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0664690[2] |
Lake Mary Township is a township in Douglas County, Minnesota, United States. The population was 997 at the 2000 census.
Lake Mary Township was organized in 1867, and took its name from the Lake Mary within its borders.[3]
According to the United States Census Bureau, the township has a total area of 35.2sqmi, of which 28.7sqmi is land and 6.5sqmi (18.36%) is water.
As of the census of 2000, there were 997 people, 362 households, and 309 families residing in the township. The population density was 34.7sp=usNaNsp=us. There were 491 housing units at an average density of 17.1sp=usNaNsp=us. The racial makeup of the township was 99.80% White, 0.10% Native American and 0.10% Asian. Hispanic or Latino of any race were 0.20% of the population.
There were 362 households, out of which 36.7% had children under the age of 18 living with them, 79.6% were married couples living together, 3.0% had a female householder with no husband present, and 14.6% were non-families. 11.3% of all households were made up of individuals, and 6.1% had someone living alone who was 65 years of age or older. The average household size was 2.75 and the average family size was 2.98.
In the township the population was spread out, with 27.3% under the age of 18, 5.3% from 18 to 24, 26.0% from 25 to 44, 27.4% from 45 to 64, and 14.0% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 110.8 males. For every 100 females age 18 and over, there were 105.4 males.
The median income for a household in the township was $45,515, and the median income for a family was $47,500. Males had a median income of $34,044 versus $22,163 for females. The per capita income for the township was $19,621. About 3.5% of families and 3.4% of the population were below the poverty line, including 2.5% of those under age 18 and 9.0% of those age 65 or over.