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CITY · 2000 CENSUS

Keystone

South Dakota · 311 residents · 3.00 sq mi
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The short version

Keystone is a city of 311 people in South Dakota. At a median age of 41.1, this is an older place than the country as a whole. The population is up 42% since 1990. Median home value sits at $38,100. 14% of adults hold a bachelor's degree or higher. Households here earn about 25% less than in South Dakota as a whole.

At a glance
Lower income
below the US median
US median: $42,589
Older
median age 41.1
US median: 35.2
Less educated
14% hold a bachelor's degree
US average: 24%
More affordable
home values down 12%, inflation adjusted
US median home: $120,530
Section 01

Population & growth

Total population
311
+42%since 1990
from 219 in 1990
1990 – 2025
Median age
41.1
+4%since 1990
from 39.4 in 1990
US average: 35.2
Land area
3.00 sq mi
Population, 1990 – 2024
19426934441949419902000201020202024Keystone
2024336
1990201020202024
Age distribution, 2000
Under 56.4%(20)
US avg: 6.8%
5 to 94.8%(15)
US avg: 7.3%
10 to 146.1%(19)
US avg: 7.3%
15 to 194.8%(15)
US avg: 7.2%
20 to 244.5%(14)
US avg: 6.7%
25 to 3415.1%(47)
US avg: 14.2%
35 to 4415.8%(49)
US avg: 16%
45 to 5419.3%(60)
US avg: 13.4%
55 to 6411.6%(36)
US avg: 8.6%
65 to 747.4%(23)
US avg: 6.5%
75 to 843.2%(10)
US avg: 4.4%
85 and over1%(3)
US avg: 1.5%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02

Income & economy

Median household income
$26,406
−6%inflation adjusted, since 1990
from $21,250 in 1990
US average: $42,589
1990 – 2024
Per capita income
$15,828
+68%since 1990
from $9,394 in 1990
US average: $21,522
Poverty rate
16.9%
−2.5 ptssince 1990
from 19.4% in 1990
US average: 12.4%
Section 03

Housing

Median home value
$38,100
−12%inflation adjusted, since 1990
from $32,900 in 1990
US average: $120,530
1990 – 2024
Median gross rent
$492
+28%inflation adjusted, since 1990
from $292 in 1990
US average: $602
Owner-occupied
66.4%
−15.5 ptssince 1990
from 81.9% in 1990
33.6% rent
Section 04

Race & ethnicity

1990
White, non-Hispanic100%(219)
Black0%(0)
Hispanic / Latino1.8%(4)
Asian0%(0)
2000
White, non-Hispanic93.2%(290)
Black0%(0)
Hispanic / Latino3.5%(11)
Asian0%(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
14.5%
−7.6 ptssince 1990
from 22.1% in 1990
US average: 24.4%
High school or higher
83.2%
+0.7 ptssince 1990
from 82.5% in 1990
US average: 80.3%
Graduate degree
2.8%
−3.0 ptssince 1990
from 5.8% in 1990
US average: 8.8%
Section 06

Commute & transportation

Average commute
15.9 min
−54%since 1990
from 34.7 min in 1990
US average: 17.6
Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

Marital status
Men 15+
Never married25.7%(28)
Married48.6%(53)
Widowed4.6%(5)
Divorced21.1%(23)
Women 15+
Never married22.2%(30)
Married43%(58)
Widowed12.6%(17)
Divorced22.2%(30)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2000
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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Pop 249
Pitts
Pop 243
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Pop 290
Raiford
Pop 226
Places similar to Keystone
Head to head

Compare Keystone to nearby cities

KEYSTONE VS
Rapid City
Income$70,870+168%
Home value$299,400+686%
Population80,589+29971%
SEE FULL COMPARISON →
KEYSTONE VS
Box Elder
Income$73,008+176%
Home value$302,100+693%
Population13,936+5100%
SEE FULL COMPARISON →
KEYSTONE VS
Spearfish
Income$65,688+149%
Home value$346,200+809%
Population14,154+5181%
SEE FULL COMPARISON →
Frequently asked

How many people live in Keystone, South Dakota?

Keystone, South Dakota has about 311 residents according to the 2000 Census.

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

The typical household in Keystone, South Dakota earns about $26,406 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 $38,100, and the typical rent is about $492 a month.

How educated are people in Keystone, South Dakota?

About 14.5% 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 16.9% of people in Keystone, South Dakota live below the federal poverty line.

Has Keystone, South Dakota grown since 1990?

Yes, Keystone, South Dakota has grown since 1990. The population has added about 92 residents, a change of about 42 percent over that period.

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

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