According to the United States Census Bureau, the town has a total area of 4.2 square miles (10.8 km²), of which, 4.1 square miles (10.6 km²) of it is land and 0.1 square miles (0.2 km²) of it (1.92%) is water.
Located five miles outside the Great Lakes Basin, Lowell sought permission to pipe in lake water to replace city water drawn from its high fluoride deep wells. However, diversion of water out of the Great Lakes requires the approval of the Great Lakes Commission, which includes representatives of all the US states and Canadian provinces that border on the lakes. Lowell's request was turned down in 1991.
There were 2,697 households out of which 39.3% had children under the age of 18 living with them, 62.2% were married couples living together, 10.3% had a female householder with no husband present, and 24.7% were non-families. 20.4% of all households were made up of individuals and 7.6% had someone living alone who was 65 years of age or older. The average household size was 2.74 and the average family size was 3.19.
In the town the population was spread out with 28.6% under the age of 18, 8.3% from 18 to 24, 31.1% from 25 to 44, 21.1% from 45 to 64, and 10.8% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 96.5 males. For every 100 females age 18 and over, there were 91.3 males.
The median income for a household in the town was $49,173, and the median income for a family was $54,797. Males had a median income of $45,023 versus $23,378 for females. The per capita income for the town was $19,752. About 5.6% of families and 6.5% of the population were below the poverty line, including 7.8% of those under age 18 and 5.4% of those age 65 or over.
Lowell Public Library is currently not an official branch of the Lake County Public Library system. For several years, Lake County Libraries have attempted to consolidate Lowell Public Library, but Lowell has refused citing that its Shelby and Schneider branches would be lost.