Lakeside is an unincorporated area and census-designated place in Clay County, Florida, United States. It is part of the greater Orange Park area and is included in the Jacksonville, Florida Metropolitan Statistical Area. The population was 31,275 at the 2020 census, up from 30,943 at the 2010 census.
Geography
Lakeside is located in northeastern Clay County. It is bordered on its northeastern edge by the Town of Orange Park. To the north is the Bellair-Meadowbrook Terrace CDP, and to the southeast, across Doctors Lake, an inlet of the St. Johns River, is Fleming Island. The community of Doctors Inlet is just to the south of Lakeside.
According to the United States Census Bureau, the CDP has a total area of , of which is land and , or 13.96%, is water.
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| align-fn = center
Racial and ethnic composition
{| class="wikitable"
|+Lakeside racial composition<br> (Hispanics excluded from racial categories)<br> (NH = Non-Hispanic)<br>
!Race
!Pop 2010
!Pop 2020
!% 2010
!% 2020
|-
|White (NH)
|23,476
|21,416
|75.87%
|68.48%
|-
|Black or African American (NH)
|2,962
|3,242
|9.57%
|10.37%
|-
|Native American or Alaska Native (NH)
|126
|93
|0.41%
|0.30%
|-
|Asian (NH)
|889
|945
|2.87%
|3.02%
|-
|Pacific Islander or Native Hawaiian (NH)
|34
|51
|0.11%
|0.16%
|-
|Some other race (NH)
|74
|165
|0.24%
|0.53%
|-
|Two or more races/Multiracial (NH)
|869
|1,739
|2.81%
|5.56%
|-
|Hispanic or Latino (any race)
|2,513
|3,624
|8.12%
|11.59%
|-
|Total
|30,943
|31,275
|
|}
2020 census
As of the 2020 census, Lakeside had a population of 31,275. The median age was 41.9 years. 21.4% of residents were under the age of 18 and 19.1% of residents were 65 years of age or older. For every 100 females there were 93.7 males, and for every 100 females age 18 and over there were 90.7 males age 18 and over.
There were 11,882 households in Lakeside, including 8,249 families. Of all households, 31.3% had children under the age of 18 living in them. 51.6% were married-couple households, 15.9% were households with a male householder and no spouse or partner present, and 25.8% were households with a female householder and no spouse or partner present. About 21.8% of all households were made up of individuals and 10.4% had someone living alone who was 65 years of age or older.
! Race !! Number !! Percent
|-
| White || 22,303 || 71.3%
|-
| Black or African American || 3,370 || 10.8%
|-
| American Indian and Alaska Native || 145 || 0.5%
|-
| Asian || 962 || 3.1%
|-
| Native Hawaiian and Other Pacific Islander || 54 || 0.2%
|-
| Some other race || 1,216 || 3.9%
|-
| Two or more races || 3,225 || 10.3%
|-
| Hispanic or Latino (of any race) || 3,624 || 11.6%
|}
2010 census
As of the 2010 United States census, there were 30,943 people, 11,758 households, and 9,163 families residing in the CDP.
2000 census
As of the census The college has a regular student base of 2,221 students but also hosts many dual enrollment students from Clay County high schools.