2020 census As of the
2020 census, Lamar had a population of 4,266. The median age was 39.0 years. 24.9% of residents were under the age of 18 and 19.9% of residents were 65 years of age or older. For every 100 females there were 90.8 males, and for every 100 females age 18 and over there were 86.2 males age 18 and over. 0.0% of residents lived in urban areas, while 100.0% lived in rural areas. There were 1,819 households in Lamar, of which 27.4% had children under the age of 18 living in them. Of all households, 43.3% were married-couple households, 17.2% were households with a male householder and no spouse or partner present, and 32.6% were households with a female householder and no spouse or partner present. About 34.1% of all households were made up of individuals and 17.8% had someone living alone who was 65 years of age or older. Of the 1,866 households 32.5% had children under the age of 18 living with them, 45.9% were married couples living together, 13.9% had a female householder with no husband present, 4.7% had a male householder with no wife present, and 35.6% were non-families. 31.2% of households were one person and 17.7% were one person aged 65 or older. The average household size was 2.38 and the average family size was 2.96. The median age was 39.6 years. 25.8% of residents were under the age of 18; 8.2% were between the ages of 18 and 24; 22.3% were from 25 to 44; 24.2% were from 45 to 64; and 19.5% were 65 or older. The gender makeup of the city was 46.6% male and 53.4% female.
2000 census At the
2000 census there were 4,425 people, 1,835 households, and 1,154 families living in the city. The population density was . There were 1,995 housing units at an average density of . The
racial makeup of the city was 96.61% White, 0.18% African American, 0.61% Native American, 0.34% Asian, 0.14% Pacific Islander, 0.34% from other races, and 1.79% from two or more races. Hispanic or Latino of any race were 1.40%. Of the 1,835 households 32.0% had children under the age of 18 living with them, 48.2% were married couples living together, 11.4% had a female householder with no husband present, and 37.1% were non-families. 33.3% of households were one person and 18.1% were one person aged 65 or older. The average household size was 2.35 and the average family size was 2.98. The age distribution was 26.6% under the age of 18, 8.5% from 18 to 24, 24.9% from 25 to 44, 19.5% from 45 to 64, and 20.5% 65 or older. The median age was 37 years. For every 100 females, there were 87.2 males. For every 100 females age 18 and over, there were 80.8 males. The median household income was $29,296 and the median family income was $38,007. Males had a median income of $26,375 versus $20,688 for females. The per capita income for the city was $15,684. About 9.7% of families and 12.1% of the population were below the
poverty line, including 11.0% of those under age 18 and 17.2% of those age 65 or over. ==Geography==