Major highways

• I-94 forms the southernmost boundary of the city
• M-52 (Main Street) runs south–north through the center of the city.

Climate

This climatic region has large, varying seasonal temperature differences, with warm to hot (and often humid) summers and cold (sometimes severely cold) winters. According to the Köppen Climate Classification system, Chelsea has a humid continental climate, abbreviated "Dfb" on climate maps.^[8]

2010 census

As of the census^[10] of 2010, there were 4,944 people, 2,224 households, and 1,284 families living in the city. The population density was 1,362.0 inhabitants per square mile (525.9/km²). There were 2,436 housing units at an average density of 671.1 per square mile (259.1/km²). The racial makeup of the city was 96.1% White, 0.4% African American, 0.3% Native American, 1.1% Asian, 0.6% from other races, and 1.5% from two or more races. Hispanic or Latino of any race were 2.5% of the population.

There were 2,224 households, of which 28.1% had children under the age of 18 living with them, 46.2% were married couples living together, 8.8% had a female householder with no husband present, 2.8% had a male householder with no wife present, and 42.3% were non-families. 37.2% of all households were made up of individuals, and 21.9% had someone living alone who was 65 years of age or older. The average household size was 2.18 and the average family size was 2.91.

The median age in the city was 43.5 years. 22.7% of residents were under the age of 18; 4.7% were between the ages of 18 and 24; 24% were from 25 to 44; 25.9% were from 45 to 64; and 22.7% were 65 years of age or older. The gender makeup of the city was 45.5% male and 54.5% female.

2000 census

As of the census^[2] of 2000, there were 4,398 people, 1,840 households, and 1,133 families living in the village. The population density was 1,315.3 inhabitants per square mile (507.8/km²). There were 1,913 housing units at an average density of 572.1 per square mile (220.9/km²). The racial makeup of the village was 97.14% White, 0.70% African American, 0.27% Native American, 0.48% Asian, 0.07% Pacific Islander, 0.39% from other races, and 0.95% from two or more races. Hispanic or Latino of any race were 0.82% of the population.

There were 1,840 households, out of which 29.7% had children under the age of 18 living with them, 48.3% were married couples living together, 10.9% had a female householder with no husband present, and 38.4% were non-families. 35.4% of all households were made up of individuals, and 19.7% had someone living alone who was 65 years of age or older. The average household size was 2.27 and the average family size was 2.95.

In the village the population was spread out, with 23.6% under the age of 18, 5.2% from 18 to 24, 25.0% from 25 to 44, 22.2% from 45 to 64, and 24.0% who were 65 years of age or older. The median age was 43 years. For every 100 females, there were 82.9 males. For every 100 females age 18 and over, there were 75.0 males.

The median income for a household in the village was $51,132, and the median income for a family was $72,266. Males had a median income of $50,506 versus $35,579 for females. The per capita income for the village was $27,609. About 2.5% of families and 4.3% of the population were below the poverty line, including 2.9% of those under age 18 and 5.0% of those age 65 or over.