Allegan County, Michigan

Adjacent counties

By land

• Ottawa County – north
• Kent County – northeast
• Barry County – east
• Kalamazoo County – southeast
• Van Buren County – south

By water

• Lake County, Illinois – southwest
• Kenosha County, Wisconsin – west
• Racine County, Wisconsin – northwest

Major highways

• I-196
• BL I-196
• US 31
• 
  Bus. US 31
• US 131
• M-40
• M-89
• M-179
• M-222
• A-2
• A-37
• A-42
• A-45

2020 census

As of the 2020 census, the county had a population of 120,502. The median age was 40.3 years. 24.2% of residents were under the age of 18 and 17.3% of residents were 65 years of age or older. For every 100 females there were 100.8 males, and for every 100 females age 18 and over there were 99.8 males age 18 and over.^[13][14]

The racial makeup of the county was 87.6% White, 1.3% Black or African American, 0.7% American Indian and Alaska Native, 0.7% Asian, <0.1% Native Hawaiian and Pacific Islander, 3.4% from some other race, and 6.3% from two or more races. Hispanic or Latino residents of any race comprised 7.8% of the population.^[14]

32.4% of residents lived in urban areas, while 67.6% lived in rural areas.^[15]

There were 45,545 households in the county, of which 31.3% had children under the age of 18 living in them. Of all households, 56.9% were married-couple households, 16.2% were households with a male householder and no spouse or partner present, and 20.1% were households with a female householder and no spouse or partner present. About 23.0% of all households were made up of individuals and 10.1% had someone living alone who was 65 years of age or older.^[13]

There were 51,789 housing units, of which 12.1% were vacant. Among occupied housing units, 82.5% were owner-occupied and 17.5% were renter-occupied. The homeowner vacancy rate was 1.1% and the rental vacancy rate was 6.1%.^[13]

2010 census

As of the 2010 United States census, there were 111,408 people living in the county. 92.9% were White, 1.2% Black or African American, 0.6% Asian, 0.6% Native American, 2.8% of some other race and 1.9% of two or more races. 6.7% were Hispanic or Latino (of any race). 23.0% were of Dutch, 17.5% German, 8.3% English, 7.1% Irish and 7.1% American ancestry.^[16]

2000 census

As of the 2000 United States census,^[17] there were 105,665 people, 38,165 households, and 28,394 families living in the county. The population density was 128 inhabitants per square mile (49/km²). There were 43,292 housing units at an average density of 52 per square mile (20/km²). The racial makeup of the county was 93.47% White, 1.31% Black or African American, 0.55% Native American, 0.55% Asian, 0.03% Pacific Islander, 2.77% from other races, and 1.32% from two or more races. 5.72% of the population were Hispanic or Latino of any race. 25.6% were of Dutch, 17.8% German, 9.6% American, 8.4% English and 7.2% Irish ancestry, 93.6% spoke only English; 5.2% spoke Spanish at home.

There were 38,165 households, out of which 37.40% had children under the age of 18 living with them, 61.40% were married couples living together, 9.10% had a female householder with no husband present, and 25.60% were non-families. 20.70% of all households were made up of individuals, and 7.80% had someone living alone who was 65 years of age or older. The average household size was 2.72 and the average family size was 3.15.

The county population contained 28.90% under the age of 18, 8.00% from 18 to 24, 30.00% from 25 to 44, 22.00% from 45 to 64, and 11.10% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 99.60 males. For every 100 females age 18 and over, there were 97.60 males.

The median income for a household in the county was $45,813, and the median income for a family was $51,908. Males had a median income of $38,681 versus $26,887 for females. The per capita income for the county was $19,918. About 5.00% of families and 7.30% of the population were below the poverty line, including 7.50% of those under age 18 and 7.90% of those age 65 or over.

Religion

• The Reformed Church in America was the largest Protestant denomination with 4,500 members in 11 churches.
• The United Methodist Church was second, with 3,600 congregants in 20 churches.
• The Christian Reformed Church was third, with 10 churches and 2,600 members.
• The Catholic Church has 10,000 members as of 2010^[update].^[18]
• The Church of Jesus Christ of Latter-day Saints has one meetinghouse.^[19]

Elected officials

(Information as of January 2025)

Cities

Villages

• Hopkins
• Martin

Census-designated place

• Dorr

Unincorporated communities

Townships