Spring Arbor is an unincorporated community and census-designated place (CDP) within Spring Arbor Township, Jackson County, in the U.S. state of Michigan. The population of the CDP was 2,881 at the 2010 census, up from 2,188 at the 2000 census. There is a post office in Spring Arbor with ZIP code 49283 that serves an area larger than the CDP, but smaller than the township. Spring Arbor Township, which includes the community and surrounding area, had a population of 8,267 in 2010.
Spring Arbor is in western Jackson County, in the center of Spring Arbor Township. State highway M-60 passes through the center of town, leading northeast 9 miles (14 km) to Jackson, the county seat, and southwest 24 miles (39 km) to Tekonsha.
According to the United States Census Bureau, the Spring Arbor CDP has a total area of 2.8 square miles (7.3 km), of which 0.03 square miles (0.09 km), or 1.21%, are water. The community sits on the low height of land between the Kalamazoo River watershed to the west and the Grand River watershed to the east.
Spring Arbor is well known for its artesian water springs which form several small lakes, creeks and rivers. Lime Lake County Park is located on 2 acres (0.81 ha) in Spring Arbor including a boat launch, a swimming area, playground equipment, and the Falling Waters Trail. The lake was created by the quarrying of marl, a calcium carbonate or lime-rich mud used to make concrete. Divers frequent this lake to view bizarre underwater mountains, pillars, and spires left behind from concrete production.
As of the census of 2000, there were 2,188 people, 643 households, and 367 families residing in the CDP. The population density was 792.2 per square mile (306.1/km²). There were 682 housing units at an average density of 246.9 per square mile (95.4/km²). The racial makeup of the CDP was 95.34% White, 1.83% African American, 0.23% Native American, 1.19% Asian, 0.32% Pacific Islander, 0.27% from other races, and 0.82% from two or more races. 1.10% of the population were Hispanic or Latino of any race.
There were 643 households out of which 25.3% had children under the age of 18 living with them, 48.7% were married couples living together, 6.7% had a female householder with no husband present, and 42.9% were non-families. 38.9% of all households were made up of individuals and 23.8% had someone living alone who was 65 years of age or older. The average household size was 2.24 and the average family size was 3.04.
In the CDP, the population was spread out with 16.0% under the age of 18, 31.8% from 18 to 24, 16.9% from 25 to 44, 14.4% from 45 to 64, and 21.0% who were 65 years of age or older. The median age was 28 years. For every 100 females, there were 72.3 males. For every 100 females age 18 and over, there were 67.1 males.
The median income for a household in the CDP was $38,750, and the median income for a family was $67,647. Males had a median income of $42,500 versus $26,510 for females. The per capita income for the CDP was $14,490. 8.9% of the population and 6.7% of families were below the poverty line. Out of the total people living in poverty, 7.8% are under the age of 18 and 9.3% are 65 or older.