View source for Ballston Spa, New York

===2020 census===
As of the [[2020 United States census|2020 census]], Ballston Spa had a population of 5,111. The median age was 42.0 years. 19.2% of residents were under the age of 18 and 18.9% of residents were 65 years of age or older. For every 100 females there were 96.1 males, and for every 100 females age 18 and over there were 94.2 males age 18 and over.<ref name="Census2020DP">{{cite web|title=2020 Decennial Census Demographic Profile (DP1)|url=https://api.census.gov/data/2020/dec/dp?get=NAME,DP1_0021P,DP1_0024P,DP1_0025C,DP1_0049C,DP1_0045C,DP1_0069C,DP1_0073C,DP1_0125P,DP1_0126P,DP1_0129P,DP1_0133P,DP1_0137P,DP1_0138P,DP1_0139P,DP1_0141P,DP1_0142P,DP1_0143P,DP1_0145P,DP1_0146P,DP1_0147C,DP1_0148C,DP1_0149C,DP1_0156C,DP1_0157C,DP1_0158C,DP1_0159P,DP1_0160P&for=place%3A04253&in=state%3A36|website=United States Census Bureau|year=2021|access-date=April 30, 2026|df=mdy}}</ref><ref name="Census2020PL">{{cite web|title=2020 Decennial Census Redistricting Data (Public Law 94-171)|url=https://api.census.gov/data/2020/dec/pl?get=NAME,P1_001N,P1_003N,P1_004N,P1_005N,P1_006N,P1_007N,P1_008N,P1_009N,P2_001N,P2_002N,H1_001N,H1_002N&for=place%3A04253&in=state%3A36|website=United States Census Bureau|year=2021|access-date=April 30, 2026|df=mdy}}</ref>

100.0% of residents lived in urban areas, while 0.0% lived in rural areas.<ref name="Census2020DHC">{{cite web|title=2020 Decennial Census Demographic and Housing Characteristics (DHC)|url=https://api.census.gov/data/2020/dec/dhc?get=NAME,P2_002N,P2_003N&for=place%3A04253&in=state%3A36|website=United States Census Bureau|year=2023|access-date=April 30, 2026|df=mdy}}</ref>

There were 2,317 households in Ballston Spa, of which 25.0% had children under the age of 18 living in them. Of all households, 36.5% were married-couple households, 21.8% were households with a male householder and no spouse or partner present, and 31.5% were households with a female householder and no spouse or partner present. About 38.8% of all households were made up of individuals and 15.3% had someone living alone who was 65 years of age or older.<ref name="Census2020DP"/>

There were 2,480 housing units, of which 6.6% were vacant. The homeowner vacancy rate was 2.3% and the rental vacancy rate was 5.4%.<ref name="Census2020DP"/>

{| class="wikitable"
|+ Racial composition as of the 2020 census<ref name="Census2020PL"/>
! Race !!
|-
| [[White Americans|White]] || 94.0%
|-
| [[African Americans|Black or African American]] || 1.0%
|-
| [[Native Americans in the United States|American Indian and Alaska Native]] || 0.2%
|-
| [[Asian Americans|Asian]] || 1.0%
|-
| [[Native Hawaiians|Native Hawaiian]] and [[Pacific Islander|Other Pacific Islander]] || 0.1%
|-
| Some other race || 2.0%
|-
| [[Multiracial Americans|Two or more races]] || 0.7%
|-
| ''[[Hispanic and Latino Americans|Hispanic or Latino]] (of any race)'' || 5.6%
|}