| Official Name: | Cottrellville Township, Michigan |
| Settlement Type: | Civil township |
| Pushpin Map: | Michigan |
| Pushpin Label Position: | left |
| Pushpin Label: | Cottrellville Township |
| Pushpin Map Caption: | Location within the state of Michigan |
| Mapsize: | 250 |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Michigan |
| Subdivision Type2: | County |
| Subdivision Name2: | St. Clair |
| Leader Title: | Supervisor |
| Leader Name: | Mary Agnes Simons |
| Established Title: | Formed |
| Established Date: | 1822 |
| Unit Pref: | Imperial |
| Area Total Km2: | 58.0 |
| Area Land Km2: | 54.9 |
| Area Water Km2: | 3.1 |
| Area Total Sq Mi: | 22.4 |
| Area Land Sq Mi: | 21.2 |
| Area Water Sq Mi: | 1.2 |
| Population As Of: | 2020 |
| Population Total: | 3406 |
| Population Density Km2: | auto |
| Population Density Sq Mi: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation M: | 182 |
| Elevation Ft: | 597 |
| Coordinates: | 42.6925°N -82.5364°W |
| Postal Code Type: | ZIP code(s) |
| Postal Code: | 48039 |
| Area Code: | 810 |
| Blank Name: | FIPS code |
| Blank Info: | 26-18400[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1626136 |
Cottrellville Township is a civil township of St. Clair County in the U.S. state of Michigan. The population was 3,406 at the 2020 Census.[2]
There are five unincorporated communities in the Township:
Cottrellville was established in 1822. A reference to the Organic Chapter of the general history points out the organization of this town so early as 1822, with A. Hemminger as Supervisor. In the general history also appear the names of its pioneer settlers - the Cotterals (Cottrells), Wards, Browns, etc. The land rises gradually from the river; is fertile, and must be considered among the rich agricultural lands of the county, the marsh, running back from the river, being perhaps the only exception, and this is capable of cultivation. Marine City of Roberts' Landing are the only centers of population in the township. The population in 1845 was 727; in 1854, 1,442; in 1864, 1,930; in 1870, 2,371; and in 1880, 2,904. The equalized valuation is $600,000; number of acres, 13,011, and number of children of school age,
According to the United States Census Bureau, the township has a total area of 22.4sqmi, of which 21.2sqmi is land and 1.2sqmi (5.27%) is water.
As of the census of 2000, there were 3,814 people, 1,384 households, and 1,055 families residing in the township. The population density was 180sp=usNaNsp=us. There were 1,497 housing units at an average density of 70.6sp=usNaNsp=us. The racial makeup of the township was 98.69% White, 0.08% African American, 0.10% Native American, 0.16% Asian, 0.08% Pacific Islander, and 0.89% from two or more races. Hispanic or Latino of any race were 0.76% of the population.
There were 1,384 households, out of which 35.9% had children under the age of 18 living with them, 63.0% were married couples living together, 8.8% had a female householder with no husband present, and 23.7% were non-families. 19.4% of all households were made up of individuals, and 7.4% 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 3.16.
In the township the population was spread out, with 27.5% under the age of 18, 7.5% from 18 to 24, 30.6% from 25 to 44, 23.9% from 45 to 64, and 10.5% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 101.8 males. For every 100 females age 18 and over, there were 99.1 males.
The median income for a household in the township was $47,396, and the median income for a family was $53,750. Males had a median income of $42,418 versus $29,600 for females. The per capita income for the township was $24,510. About 2.5% of families and 2.6% of the population were below the poverty line, including 1.4% of those under age 18 and 6.6% of those age 65 or over.