Keystone ZIP Codes — Pennington County, SD

There is one unique ZIP code in Keystone, South Dakota and it is 57751. Area code: 605.

ZIP codes

44.22

sq mi land

0.01

sq mi water

605

area code

Keystone, SD ZIP code map

About Keystone, SD

Keystone, South Dakota, is a small town known for its rich history and stunning landscapes. Nestled in the Black Hills region, it offers a unique blend of natural beauty and cultural attractions. The town is a favorite destination for tourists exploring the surrounding national parks and attractions.

Location & geography

Keystone is located in Pennington County, just south of the much larger city of Rapid City, which is approximately 24 miles to the north. The town is situated amidst the rugged terrain of the Black Hills, featuring mountainous landscapes and picturesque views. Covering a total area of 44.22 square miles, Keystone has a minuscule water area of just 0.01 square miles.

Community & economy

The community of Keystone is known for its friendly atmosphere and vibrant local culture, with a population that enjoys the serenity of small-town living. Tourism plays a significant role in the local economy, with attractions like Mount Rushmore National Memorial drawing visitors year-round. Daily life in Keystone often revolves around outdoor activities, local shops, and annual events that celebrate the town's heritage.

Transportation

Transportation in Keystone is facilitated primarily by U.S. Route 16A, which connects the town to nearby attractions and larger cities. The nearest major airport is Rapid City Regional Airport, located about 30 miles to the north, providing both domestic and limited international flights. Public transit options are limited, making personal vehicles the most common means of getting around.

History

Keystone was founded in the late 1800s during the gold rush era, attracting miners and settlers to the region. The town's economy has historically been tied to mining and tourism, particularly with the establishment of Mount Rushmore, which significantly boosted the local industry. Notable events in Keystone's history include the dedication of the Mount Rushmore National Memorial in 1941, which solidified its place as a key tourist destination.

Did you know?

One surprising fact about Keystone is that it is home to the famous Mount Rushmore National Memorial, which depicts the faces of four U.S. presidents carved into granite. Additionally, Keystone hosts various annual festivals that celebrate local culture and promote tourism, including the Keystone Arts and Crafts Festival.

ZIP codes for Keystone, SD (1)

ZIP code	City	County	Map
57751	Keystone	Pennington	View map

Demographics & statistics

947

Population

55.5

Median age

$98,393

Median household income

$42,910

Per capita income

$357,100

Median home value

$561

Median monthly rent

84.1%

Home ownership

6.2%

Poverty rate

3.4%

Unemployment

415

Housing units

43.8%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	190	20.1%
18 and over	757	79.9%
65 and over	198	20.9%
Median age	55.5 years

Race & ethnicity

White 91.4%

Two or more races 3.9%

Hispanic or Latino 2.9%

Asian 0.8%

American Indian / Alaska Native 0.8%

Other race 0.2%

Group	Count	%
White	891	91.4%
Two or more races	38	3.9%
Hispanic or Latino	28	2.9%
Asian	8	0.8%
American Indian / Alaska Native	8	0.8%
Other race	2	0.2%

Household income

$10k–$15k 2.5%

$15k–$25k 5.8%

$25k–$35k 5.8%

$35k–$50k 10.9%

$50k–$75k 14.5%

$75k–$100k 11.7%

$100k–$150k 32.6%

$150k–$200k 11.4%

$200k+ 4.7%

Range	% of households
$10k–$15k	2.5%
$15k–$25k	5.8%
$25k–$35k	5.8%
$35k–$50k	10.9%
$50k–$75k	14.5%
$75k–$100k	11.7%
$100k–$150k	32.6%
$150k–$200k	11.4%
$200k+	4.7%
Median income	$98,393

Housing

Home values

Under $50k 12.3%

$50k–$100k 3.3%

$100k–$150k 0.7%

$150k–$200k 6.6%

$200k–$300k 20.5%

$300k–$500k 18.2%

$500k–$1M 34.8%

$1M+ 3.6%

Housing overview

Metric	Value
Median home value	$357,100
Median rent / month	$561
Owner occupied	84.1%
Renter occupied	15.9%
Vacant	23.9%
Single-family detached	62.9%
Large apartment buildings	0.0%
Mobile homes	19.5%
Median rooms	4.4
Avg household size (owned)	2.64

Year built

Era	%
2020 or later	0.0%
2010–2019	4.9%
2000–2009	29.4%
1990–1999	16.1%
1980–1989	13.6%
1970–1979	13.8%
1960–1969	3.8%
1950–1959	7.6%
1940–1949	0.0%
1939 or earlier	10.8%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	11.9%
2 bedrooms	31.4%
3 bedrooms	41.5%
4 bedrooms	13.1%
5+ bedrooms	2.1%

Vehicles per household

Vehicles	% of households
No vehicle	1.7%
1 vehicle	4.7%
2 vehicles	28.7%
3 or more	64.9%

Heating fuel

Fuel type	%
Utility gas	7.0%
Electricity	32.6%
Propane / LP gas	36.5%
Fuel oil	0.3%
Wood	23.1%

Households & families

Household type	Count	%
Married-couple family	270	75.2%
Cohabiting couple	25	7.0%
Male householder, no spouse	33	9.2%
Female householder, no spouse	31	8.6%
Households with children under 18	140	39.0%
Households with seniors (65+)	120	33.4%
Average household size	2.59

Marital status

Status	Male	Female
Never married	13.3%	26.4%
Married	72.3%	61.9%
Separated	0.0%	0.0%
Widowed	0.0%	1.2%
Divorced	14.3%	10.6%

Education

Less than 9th grade 1.4%

Some HS, no diploma 5.3%

HS graduate 29.2%

Some college, no degree 10.6%

Associate's degree 9.7%

Bachelor's degree 18.5%

Graduate / professional 25.3%

Metric	%
HS diploma or higher	93.3%
Bachelor's or higher	43.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	7	4.0%
Kindergarten	10	5.6%
Elementary school	66	37.3%
High school	74	41.8%
College / grad school	20	11.3%

Employment

Industry of employment

Education & healthcare 27.3%

Retail trade 20.9%

Arts, food & hospitality 15.5%

Construction 10.3%

Transportation & utilities 7.5%

Public administration 6.5%

Professional & management 4.5%

Agriculture & mining 4.3%

Other services 1.7%

Finance & real estate 0.9%

Manufacturing 0.2%

Wholesale trade 0.2%

Information 0.2%

Occupation

Category	%
Management, business & arts	33.6%
Service	21.9%
Sales & office	20.6%
Natural resources & construction	16.3%
Production & transportation	7.7%

Employment type

Type	%
Private sector	68.4%
Government	25.0%
Self-employed	5.8%
Unpaid family workers	0.7%

Commute

Method	%
Drive alone	69.8%
Carpool	9.2%
Public transit	0.0%
Walk	13.0%
Other means	4.0%
Avg commute (minutes)	30.8

Poverty

All people 6.2%

Under 18 years 4.9%

18 and over 6.5%

Married-couple families 1.9%

Female-led households 16.0%

Income support

Source	% of households
Social Security	38.4%
Retirement income	28.7%
Supplemental Security	1.1%
Cash public assistance	0.3%
Food stamps / SNAP	7.0%

Health indicators

Condition	%
High blood pressure	33.5%
High cholesterol	36.7%
Heart disease	6.9%
Stroke	2.8%
Asthma	8.4%
Arthritis	26.6%
Kidney disease	2.8%
Pulmonary disease	5.4%
Cancer	8.1%

Behavior / access	%
Binge drinking	17.3%
No physical activity	18.5%
Less than 7 hrs sleep	25.4%
Fair or poor health	9.7%
Poor mental health	9.1%
Poor physical health	8.0%
No health insurance	8.8%
Visited doctor (checkup)	77.3%
Visited dentist	72.4%
Cholesterol screening	92.8%
Teeth loss	9.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	136	18.0%

Disability	%
Any disability	7.5%
Under 18	0.0%
18–64 years	3.0%
65 and over	27.3%

Health insurance coverage

Type	%
Private insurance	67.3%
Public insurance	30.4%
Uninsured under 19	4.7%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	907	95.8%
Spanish	44	4.9%
Other Indo-European	37	4.1%
Asian & Pacific Islander	7	0.8%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	898	94.8%
Born in same state	890	94.0%
Born in different state	389	41.1%
Foreign born	8	0.8%
Naturalized citizen	49	5.2%
Not a US citizen	32	65.3%

Ancestry

Ancestry	Count	%
French	174	18.4%
Polish	102	10.8%
Italian	93	9.8%

Ancestry	Count	%
Arab	22	2.3%
Dutch	5	0.5%
Irish	4	0.4%

Technology access

Metric	% of households
Computer access	37.9%
Internet access	97.5%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What ZIP codes does Keystone, SD have?

Keystone, SD has one ZIP code: 57751. Each ZIP code serves a distinct delivery area within the city and surrounding region.