Keystone, SD demographics:
population, income, and more

Total population
336
-16.8% year-over-year change
Median household income
$64,702/yr
4.1% year-over-year change
Housing units
232
13.7% year-over-year change

Keystone population

How many people live in Keystone

Keystone is home to 336 residents, according to the most recent Census data. Gender-wise, 56% of Keystone locals are male, and 44% are female.

Total population
336
-16.8% year-over-year change
Gender ratio
Male
56%
188
Female
44%
148
Value Percent YoY change
Male 188 56% -15.3%
Female 148 44% -18.7%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Keystone is 38, with the population distributed as follows: about 24.4% are children under 15, then 11.6% are in the 15 to 24 age group. Adults between 25 and 44 make up 25% of the population, while another 25.6% fall into the 45 to 64 bracket. Finally, around 13.4% are 65 or older.

Median age
38.1
Age breakdown
Under 15
24.4%
15 to 24
11.6%
25 to 44
25%
45 to 64
25.6%
Over 65
13.4%
Value Percent YoY change
Under 15 82 24.4% -21.1%
15 to 24 39 11.6% -4.9%
25 to 44 84 25% -26.3%
45 to 64 86 25.6% -8.5%
Over 65 45 13.4% -11.8%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Keystone, 89.9% of the population are US-born citizens, while 9.5% have gained naturalized citizenship. At the same time, 0.6% of residents are non-citizens. There’s also a share of 11.6% that includes residents with two or more races.

Citizenship
U.S.-born citizens
89.9%
Non-U.S.-born citizens
9.5%
Non-citizens
0.6%
Value Percent YoY change
U.S.-born citizens 302 89.9% -19.2%
Non-U.S.-born citizens 32 9.5% 6.7%
Non-citizens 2 0.6% N/A
Racial breakdown
White
84.5%
Black or African American
0%
American Indian and Alaska Native
0.3%
Asian
0.6%
Native Hawaiian and other Pacific Islander
0%
Two or more races
11.6%
Other
3%
Value Percent
White 284 84.5%
American Indian and Alaska Native 1 0.3%
Asian 2 0.6%
Two or more races 39 11.6%
Other 10 3%

Households in Keystone

A peek inside Keystone households

Keystone has 107 households, with an average of 3 members in each. Of these, 74.8% are families, while the remaining 25.2% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
107
-22.5% year-over-year change
Average people per household
3
Non-family households
27
Family households
80
Value Percent YoY change
Non-family households 27 25.2% -25.0%
Family households 80 74.8% -21.6%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Keystone

The housing landscape of Keystone

Keystone's housing consists of 232 units, with 53.9% being detached single-family homes ideal for those wanting space. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 37.1% of the housing landscape.

Housing units
232
13.7% year-over-year change
Housing types
Value Percent
1 unit, detached 125 53.9%
2 units 5 2.2%
3 or 4 units 9 3.9%
5 to 9 units 7 3%
Mobile home 86 37.1%
Homes built since 2020
2
% year-over-year change

The age of buildings in Keystone

In Keystone, the median construction year is 1977. Most development happened in the second half of the 20th century. Then, 9% of homes were added from 2000 to 2009, 7.3% between 2010 and 2019, and 0.9% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 24 10.3% -20.0%
Built between 1950 and 1959 14 6% -22.2%
Built between 1960 and 1969 5 2.2% -28.6%
Built between 1970 and 1979 99 42.7% 59.7%
Built between 1980 and 1989 34 14.7% -2.9%
Built between 1990 and 1999 16 6.9% -20.0%
Built between 2000 and 2009 21 9% 40.0%
Built between 2010 and 2019 17 7.3% 0.0%
Built in 2020 or later 2 0.9% N/A
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Keystone occupancy rates

Out of the 107 occupied housing units in Keystone, 70.1% are owner-occupied, while 29.9% are lived in by tenants. Meanwhile, 53.9% of all homes on the local market sit vacant.

Occupied housing units
107
-22.5% year-over-year change
Occupancy breakdown
Renter occupied
32
Owner occupied
75
Value Percent YoY
change
Renter occupied 32 29.9% -28.9%
Owner occupied 75 70.1% -19.4%
Unoccupied housing units
53.9%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Keystone housing costs

Housing costs in Keystone come to a median of $731 per month, while tenants specifically pay a median gross rent of $546.

Median housing costs per month
$731/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Keystone
$546/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Keystone

Keystone education at a glance

About 66% of the population in Keystone went to high school, while 10.5% pursued college studies. Another 9.7% earned an associate degree and 7.6% hold a bachelor’s. Meanwhile, 4.6% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 4 1.7% 0.0%
High school diploma 157 66% -11.3%
College diploma 25 10.5% -35.9%
Associate degree 23 9.7% 9.5%
Bachelor's degree 18 7.6% -45.5%
Graduate degree 11 4.6% -8.3%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Keystone

How much people earn in Keystone

The average annual household income in Keystone was $83,955 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a -3.9% change from the previous year. At the same time, the median income stood at $64,702, reflecting a +4.1% shift over the same period.

Average household income in Keystone
$83,955/year
-3.9% year-over-year change
Median household income in Keystone
$64,702/year
4.1% year-over-year change

Keystone income by age

In Keystone, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $64,667. Those with someone between 45 and 64 in charge, often well established professionally, earn $63,750 overall. Overall, 93.2% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
25 - 44 $64,667 5.0%
45 - 64 $63,750 2.3%
Over 65 $86,250 6.2%
Above poverty level
313
Below poverty level
23
Value Percent YoY
change
Above poverty level 313 93.2% -12.6%
Below poverty level 23 6.8% -47.7%

Average renter income in Keystone

To get a better sense of what renters earn on average in Keystone, their median household income was $31,250 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 21%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$31,250
Rent-to-income ratio
21%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in Keystone

Workforce and job types in Keystone

The job market in Keystone is powered by 178 working residents, spread across a range of industries and roles. 61.8% of the working population are employed in professional or administrative positions, while 38.2% are in hands-on or service-based jobs. Also, 15.7% run their own businesses, 74.2% are employed by private companies, and 9.6% work in the public sector.

Workforce demographics

Working population
178
-17.6% year-over-year change
White collar
110
Blue collar
68
Value Percent YoY change
White collar 110 61.8% -25.2%
Blue collar 68 38.2% -1.4%
Employer type
Self employees
15.7%
Private companies
74.2%
Governmental workers
9.6%
Not for profit companies
0.6%
Value Percent YoY change
Self employees 28 15.7% -36.4%
Private companies 132 74.2% -10.2%
Governmental workers 17 9.6% -26.1%
Not for profit companies 1 0.6% -50.0%
Unemployment rate
7.8%
-16.7% year-over-year change

Available workforce

The unemployment rate in Keystone stands at 7.8%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Keystone

How people get around in Keystone

Commuting methods vary: 72.5% of residents travel by personal vehicle and 19.7% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 129 72.5% -3.7%
Walk 35 19.7% -43.5%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Keystone by zipcode?

Zipcode Population Number of households Median income Average income
57751 893 327 $97,969 $108,642

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FAQs about Keystone demographics 

What is the total population of Keystone?

Keystone has a total population of 336 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -16.8% compared to a year ago.

What is the gender ratio in Keystone?

The gender ratio in Keystone is as follows:
  • 56% males (188 residents)
  • 44% females (148 residents)

What is the median age in Keystone?

The median age in Keystone is 38.1.

What is the age distribution of the population in Keystone?

The age distribution in Keystone is as follows:
  • Under 15: 24.4% (82 residents)
  • Ages 15-24: 11.6% (39 residents)
  • Ages 25-44: 25% (84 residents)
  • Ages 45-64: 25.6% (86 residents)
  • Over 65: 13.4% (45 residents)

What is the racial and ethnic makeup of Keystone?

The racial and ethnic makeup of Keystone is as follows:
  • White: 84.5% (284 residents)
  • Black or African American: 0% (0 residents)
  • American Indian and Alaska Native: 0.3% (1 residents)
  • Asian: 0.6% (2 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 11.6% (39 residents)
  • Other: 3% (10 residents)

What percentage of the population in Keystone are U.S.-born citizens?

U.S.-born citizens represent 89.9% of the population in Keystone.

How many housing units are there in Keystone?

There are 232 housing units in Keystone, reflecting a +13.7% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Keystone and what is the average household size?

Keystone has a total of 107 households, with an average of 3 people in each.

What is the median household income in Keystone?

Keystone has a median household income of $64,702, representing a +4.1% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Keystone?

The employment rate is 92.2% in Keystone, with a workforce of 178 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 61.8% (110 residents)
  • Blue-collar workers: 38.2% (68 residents)

Places of employment:
  • Self-employed: 15.7% (28 residents)
  • Private companies: 74.2% (132 residents)
  • Governmental workers: 9.6% (17 residents)
  • Not-for-profit companies: 0.6% (1 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025