Haslett is an unincorporated community in Ingham County in the U.S. state of Michigan. It is a census-designated place (CDP) used for statistical purposes. The population was 19,220 at the 2010 census, up from 11,283 at the 2000 census, when the CDP had one-half the area that it did in 2010. Though it has its own school district and post office (ZIP code 48840), Haslett is administered by Meridian Charter Township as the local government unit. Downtown Haslett is located near the intersection of Haslett and Marsh roads.
Haslett is in northern Ingham County and is bordered by the city of East Lansing to the west and the unincorporated community of Okemos to the south. Haslett is bordered to the north by Clinton County and Shiawassee County. Business Loop I-69 (East Saginaw Street) runs through the northwest part of Haslett, leading northeast to Interstate 69 in Clinton County and west into Lansing.
According to the United States Census Bureau, the CDP has a total area of 16.3 square miles (42.1 km), of which 15.4 square miles (39.8 km) are land and 0.89 square miles (2.3 km), or 5.50%, are water.
The largest area lake, Lake Lansing, is located in Haslett and is 461 acres (1.87 km) in size. The lake has a popular beach which attracts local swimmers, sunbathers, boaters, and fishermen.
As of the census of 2000, there were 11,283 people, 5,132 households, and 2,884 families residing in the CDP. The population density was 1,354.8 per square mile (523.0/km²). There were 5,355 housing units at an average density of 643.0 per square mile (248.2/km²). The racial makeup of the CDP was 92.37% White, 2.39% Black or African American, 0.30% Native American, 2.71% Asian, 0.03% Pacific Islander, 0.73% from other races, and 1.47% from two or more races. Hispanic or Latino of any race were 2.48% of the population.
There were 5,132 households out of which 28.4% had children under the age of 18 living with them, 43.5% were married couples living together, 9.9% had a female householder with no husband present, and 43.8% were non-families. 35.7% of all households were made up of individuals and 11.4% had someone living alone who was 65 years of age or older. The average household size was 2.19 and the average family size was 2.90.
In the CDP, the population was spread out with 23.3% under the age of 18, 9.5% from 18 to 24, 30.4% from 25 to 44, 25.2% from 45 to 64, and 11.6% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 85.9 males. For every 100 females age 18 and over, there were 82.3 males.
The median income for a household in the CDP was $50,679, and the median income for a family was $69,806. Males had a median income of $51,637 versus $35,786 for females. The per capita income for the CDP was $28,686. About 4.8% of families and 7.1% of the population were below the poverty line, including 7.6% of those under age 18 and 7.8% of those age 65 or over.