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CITY · 1990 CENSUS

Keystone

South Dakota · 219 residents · 3.00 sq mi
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The short version

With 219 people, Keystone is a city in South Dakota. Owners hold 82% of the housing stock. At a median age of 39.4, this is an older place than the country as a whole. Median home value sits at $32,900. The average commute runs 35 minutes. There are 92 fewer people here than in 2000.

At a glance
Lower income
below the US median
US median: $30,130
Older
median age 39.4
US median: 33.0
Average education
22% hold a bachelor's degree
US average: 20%
Stable housing
home values roughly flat, inflation adjusted
US median home: $93,722
Section 01

Population & growth

Total population
219
−30%vs 2000
vs 311 in 2000
1990 – 2025
Median age
39.4
−4%vs 2000
vs 41.1 in 2000
US average: 33.0
Land area
3.00 sq mi
Population, 1990 – 2024
19426934441949419902000201020202024Keystone
2024336
1990201020202024
Age distribution, 1990
Under 59.6%(21)
US avg: 7.3%
5 to 96.8%(15)
US avg: 7.3%
10 to 145.9%(13)
US avg: 6.9%
15 to 190.9%(2)
US avg: 7.1%
20 to 246.4%(14)
US avg: 7.5%
25 to 3415.5%(34)
US avg: 17.5%
35 to 4412.3%(27)
US avg: 15.1%
45 to 548.7%(19)
US avg: 10.2%
55 to 6416%(35)
US avg: 8.5%
65 to 7411.4%(25)
US avg: 7.3%
75 to 841.4%(3)
US avg: 4%
85 and over5%(11)
US avg: 1.2%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02

Income & economy

Median household income
$21,250
+6%inflation adjusted, since 2000
vs $26,406 in 2000
US average: $30,130
1990 – 2024
Per capita income
$9,394
−41%vs 2000
vs $15,828 in 2000
US average: $14,340
Poverty rate
19.4%
+2.5 ptsvs 2000
vs 16.9% in 2000
US average: 13.2%
Section 03

Housing

Median home value
$32,900
+14%inflation adjusted, since 2000
vs $38,100 in 2000
US average: $93,722
1990 – 2024
Median gross rent
$292
−22%inflation adjusted, since 2000
vs $492 in 2000
US average: $450
Owner-occupied
81.9%
+15.5 ptsvs 2000
vs 66.4% in 2000
18.1% rent
Section 04

Race & ethnicity

2000
White, non-Hispanic93.2%(290)
Black0%(0)
Hispanic / Latino3.5%(11)
Asian0%(0)
Other0%
1990
White, non-Hispanic100%(219)
Black0%(0)
Hispanic / Latino1.8%(4)
Asian0%(0)
Other0%(0)

No data for the years selected.

Section 04 · Origins

Detailed origins & ancestry

Detailed origin tables are available for 2024; showing 2024 data.

Hispanic origin
Mexican23.2%(78)
Spaniard0.6%(2)
Asian origin
Filipino0.6%(2)
Pacific Islander origin
Ancestry
German34.2%(115)
Irish13.4%(45)
English10.7%(36)
Swedish8.3%(28)
Norwegian7.4%(25)
Russian1.8%(6)
Italian1.2%(4)
Polish1.2%(4)
Dutch0.9%(3)
American0.6%(2)
Czech0.6%(2)
+ 4 more ancestry groups with data
Scottish0.6%(2)
Canadian0.3%(1)
Danish0.3%(1)
French0.3%(1)
Section 05

Education

Bachelor's degree or higher
22.1%
+7.6 ptsvs 2000
vs 14.5% in 2000
US average: 20.3%
High school or higher
82.5%
−0.7 ptsvs 2000
vs 83.2% in 2000
US average: 75.2%
Graduate degree
5.8%
+3.0 ptsvs 2000
vs 2.8% in 2000
US average: 7.1%
Section 06

Commute & transportation

Average commute
34.7 min
+119%vs 2000
vs 15.9 min in 2000
US average: 21.9
Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

Marital status (2024)
Men 15+
Never married22%(31)
Married55.3%(78)
Widowed2.1%(3)
Divorced20.6%(29)
Women 15+
Never married31%(35)
Married56.6%(64)
Widowed1.8%(2)
Divorced10.6%(12)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Section 09

Health coverage

Showing 2024 (the nearest year with coverage data).

Uninsured
29.2%
+3.6 ptssince 2013
from 25.6% in 2013
US average: 8.4%
Employer-based
35.4%
+3.1 ptssince 2020
from 32.3% in 2020
US average: 54.8%
Direct-purchase
9.8%
−8.5 ptssince 2020
from 18.3% in 2020
US average: 13.8%
Medicare
14.6%
+3.7 ptssince 2020
from 10.9% in 2020
US average: 18.4%
Medicaid
23.5%
−2.5 ptssince 2020
from 26.0% in 2020
US average: 20.9%
VA health care
3.6%
−0.1 ptssince 2020
from 3.7% in 2020
US average: 2.2%
Any private
44.6%
−6.1 ptssince 2020
from 50.7% in 2020
US average: 67.1%
Any public
35.4%
−2.8 ptssince 2020
from 38.2% in 2020
US average: 36.7%

Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.

Section 09 · Service history

Veterans

Veterans by period of service, 2024
Gulf War (2001 or later)0%(0)
US avg: 26.4%
Gulf War (1990s)4.2%(1)
US avg: 24.3%
Vietnam era62.5%(15)
US avg: 33.1%
Korean War8.3%(2)
US avg: 4.5%
World War II0%(0)
US avg: 1%

Share of the 24 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.

BAR + DOT: THIS PLACE · TICK: US AVERAGE
Drill deeper

Places similar to Keystone

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Head to head

Compare Keystone to nearby cities

KEYSTONE VS
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Income$70,870+234%
Home value$299,400+810%
Population80,589+29971%
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KEYSTONE VS
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Home value$302,100+818%
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KEYSTONE VS
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Frequently asked

How many people live in Keystone, South Dakota?

Keystone, South Dakota has about 219 residents according to the 1990 Census.

What is the median household income in Keystone, South Dakota?

The typical household in Keystone, South Dakota earns about $21,250 a year. Half of households make more than that, and half make less.

Is Keystone, South Dakota expensive?

In Keystone, South Dakota, the median home is worth about $32,900, and the typical rent is about $292 a month.

How educated are people in Keystone, South Dakota?

About 22.1% of adults age 25 and over in Keystone, South Dakota hold a bachelor's degree or higher.

What is the poverty rate in Keystone, South Dakota?

About 19.4% of people in Keystone, South Dakota live below the federal poverty line.

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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

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