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Keystone town, SD

ZIP 57751 — People & Community

Source: U.S. Census Bureau ACS 2019–2023 5-Year Estimates. Page data updated 2026-08-02.

Upper Middle ClassLow Snow Area

Demographics, education attainment, health access, and community lifestyle

Population & Demographics in 57751

57751 has a population of 996 with a median age of 52.2 yrs (53.4% male).

Race & Ethnicity
White
94.6%+54% vs US avg
x
Black
0.4%-97% vs US avg
x
Asian
0.8%-86% vs US avg
x
Hispanic
6.6%-65% vs US avg
x
Age Groups
0–17
21.4%-3% vs US avg
x
18–64
59.3%-4% vs US avg
x
65+
19.3%+18% vs US avg
x
Education
Less than HS
5.5%-51% vs US avg
x
High school
30.5%+16% vs US avg
x
Some college
20.1%-30% vs US avg
x
Bachelor's+
43.9%+30% vs US avg
x
Marital Status
Married
65.2%+36% vs US avg
x
Never married
21.6%-36% vs US avg
x
Divorced
12.3%+19% vs US avg
x
Widowed / Separated
0.9%
x
Diversity Index
10/100

Higher = more diverse (Simpson index from race/ethnicity)

Social & household profile

Poverty, nativity, veterans, disability, family structure, and births (ACS).

Poverty Rate
7.0%-40% vs US avg
x
Foreign Born
22.6%+63% vs US avg
x
Veterans
16.7%+179% vs US avg
x
Disability
5.3%-60% vs US avg
x
Single Parent
2.0%-75% vs US avg
x
Recent Births
11.3%+95% vs US avg
x
Top ancestry
GermanEnglishIrish

Health & Community Indicators in 57751

Poverty Rate
7.0%-40% vs US avg
x
Veterans
16.7%+179% vs US avg
x
Foreign Born
22.6%+63% vs US avg
x
Single Parent
2.0%-75% vs US avg
x
Disability
5.3%-60% vs US avg
x
Uninsured
12.3%+54% vs US avg
x
SNAP Benefits
6.8%-42% vs US avg
x
Private School
0.0%
x
Recent Births
11.3%+95% vs US avg
x
Smartphone Only
0.0%
x

People & Community key statistics

Population statistics
Population
Population996
Median age52.2
Poverty rate7.0%
Demographics statistics
Demographics
White94.6%
Hispanic6.6%
Black0.4%
Asian0.8%
Foreign-born22.6%