|Amboy Township, Michigan|
|— Township —|
Amboy Township, Michigan
|- Total||30.6 sq mi (79.3 km2)|
|- Land||30.0 sq mi (77.6 km2)|
|- Water||0.7 sq mi (1.7 km2)|
|Elevation||948 ft (289 m)|
|- Density||40.8/sq mi (15.8/km2)|
|Time zone||Eastern (EST) (UTC-5)|
|- Summer (DST)||EDT (UTC-4)|
|GNIS feature ID||1625836|
Amboy Township was formed by an act of the Michigan Legislature on March 28, 1850, from Woodbridge Township and Ransom Township out of the partial survey townships 9 south ranges 2 and 3 west and the southern tier of sections from survey township 8 south ranges 2 and 3 west. Amboy thus consists of 12 sections or 12 miles (19 km) from east to west and averages approximately 2.5 miles (4.0 km) north to south. Ransom and Woodbridge were left with only 30 sections each instead of the usual 36 sections.
According to the United States Census Bureau, the township has a total area of 30.6 square miles (79.3 km²), of which, 30.0 square miles (77.6 km²) of it is land and 0.7 square miles (1.7 km²) of it (2.15%) is water.
As of the census of 2000, there were 1,224 people, 457 households, and 350 families residing in the township. The population density was 40.8 per square mile (15.8/km²). There were 631 housing units at an average density of 21.1/sq mi (8.1/km²). The racial makeup of the township was 99.59% White, 0.16% Native American, and 0.25% from two or more races. Hispanic or Latino of any race were 0.90% of the population.
There were 457 households out of which 29.5% had children under the age of 18 living with them, 70.5% were married couples living together, 3.3% had a female householder with no husband present, and 23.4% were non-families. 19.7% of all households were made up of individuals and 6.3% had someone living alone who was 65 years of age or older. The average household size was 2.65 and the average family size was 3.01.
In the township the population was spread out with 24.8% under the age of 18, 6.4% from 18 to 24, 25.9% from 25 to 44, 30.6% from 45 to 64, and 12.3% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 106.1 males. For every 100 females age 18 and over, there were 103.3 males.
The median income for a household in the township was $42,250, and the median income for a family was $45,250. Males had a median income of $36,118 versus $25,809 for females. The per capita income for the township was $20,578. About 6.5% of families and 10.7% of the population were below the poverty line, including 15.3% of those under age 18 and 5.1% of those age 65 or over.