2010 and 2020 census
As of the 2010 United States census, there were 1,350 people, 554 households, and 350 families residing in the city. [17]
As of the 2020 United States census, there were 1,446 people, 565 households, and 366 families residing in the city. [18]
According to the 2020 ACS, the median age in Keystone Heights was 34.3 years. 29.2% of residents were 0–19 years, 10.9% were 20–29, 17.2% were 30–39, 9.8% were 40–49, 12.2% were 50–59, and 20.8% were 60 years and over. [19]
In 2020, there were 565 households in the city, of which 36% had children under 18 living with them, 40.5% were married couples living together, and 40.9% were individual householders with no spouse or partner present. The average household size was 2.71 and the average family size was 3.13. [19]
In 2020, the median income for a household in the city was $61,250, and the median income for a family was $61,625. Males had a median income of $51,488 versus $49,063 for females. The per capita income was $30,116. About 15.7% of the population were below the poverty line including 28.5% of those under age 18 and 5.7% of those age 65 and over. [19]
In 2020, the ten largest ancestry groups in the city were German (14.4%), Irish (9.9%), English (7.2%), American (4.7%), Italian (4.6%), Polish (2.7%), Dutch (2.4%), Russian (1.5%), Welsh (1.4%), and European (1.3%). Other ancestral groups accounted for 15.8% of the population. [19] The majority of residents (96.4%) speak only English at home. Of those that speak a language other than English at home, the top languages were Vietnamese (1.7%), Spanish (1.1%), and French (0.3%).
In 2020, over half of residents (59.2%) were born in Florida. 37% of residents were born in another state, primarily other southern states. There is a small community of immigrants in Keystone Heights, accounting for 3.5% of the population. Over 92% of these immigrants are naturalized with the majority entering the United States prior to 2010. [19]
Top countries of origin for foreign-born population in Keystone Heights, FL 2020 [20] [21] | Foreign-born Population in Keystone Heights | Percentage of Keystone Heights Population | Foreign-born Population in Florida | Percentage of Florida Population |
|---|
| Philippines | 28 | 1.9% | 88,318 | 0.4% |
| Scotland | 11 | 0.7% | 6,305 | 0.03% |
| Honduras | 4 | 0.3% | 112,160 | 0.5% |
| Dominican Republic | 3 | 0.2% | 152,970 | 0.7% |
| England | 3 | 0.2% | 43,439 | 0.2% |
| Other Northern Europe | 3 | 0.2% | 2,715 | 0.01% |
2000 census
As of the census of 2000, there were 1,349 people, 515 households, and 374 families residing in the city. The population density was 296.9 people per square mile (114.6 people/km2). There were 562 housing units at an average density of 123.7 units per square mile (47.8 units/km2). The racial makeup of the city was 96.07% White, 0.44% African American, 0.52% Native American, 0.52% Asian, 0.30% Pacific Islander, 1.19% from other races, and 0.96% from two or more races. Hispanic or Latino of any race were 2.67% of the population.
In 2000, there were 515 households, out of which 36.5% had children under the age of 18 living with them, 56.7% were married couples living together, 12.6% had a female householder with no husband present, and 27.2% were non-families. 24.1% of all households were made up of individuals and 14.0% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 3.09.
In 2000, in the city, the population was spread out with 28.1% under the age of 18, 8.1% from 18 to 24, 25.0% from 25 to 44, 21.5% from 45 to 64, and 17.3% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 86.1 males. For every 100 females age 18 and over, there were 81.3 males.
In 2000, the median income for a household in the city was $39,519, and the median income for a family was $47,404. Males had a median income of $37,500 versus $24,886 for females. The per capita income for the city was $19,157. About 5.1% of families and 8.3% of the population were below the poverty line, including 10.5% of those under age 18 and 7.5% of those age 65 or over.
United States 
Florida 
