PlainZIP

Keystone, SD · standard

ZIP Code 57751

Pennington County, South Dakota - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

844
5/sq mi
$97,969
Median income
$473,500
Median home value
43.0%
Bachelor's or higher

The verdict

Keystone pairs an upper-quartile household income with upper-quartile home values, in a rural, homeowner-dominated area.

Top 20%
household income, US ZIPs
Top 15%
home value, US ZIPs
5
people per sq mi
86%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 57751 against every reporting US ZIP.

ZIP code 57751 is a sparsely populated ZIP (a standard USPS delivery area) in Keystone, Pennington County, South Dakota, home to just 844 residents across 175.8 square miles, a density of 5 people per square mile, in the Denver time zone.

ZIP 57751 lands in the middle-income range, with a median household income of $97,969 (28% above the South Dakota average), while per-capita income is $43,414. Poverty here runs at 4.6%, with unemployment measured at 2.9%. On housing, the median home value is $473,500 (147% above the state average) with median rent at $600 per month, and 85.6% of occupied units are owner-occupied.

A solid share of residents have a four-year degree: 43.0% of adults hold a bachelor's degree or higher, the median age is 54.2, and the average commute is -. Compare these figures to the South Dakota and national benchmarks above rather than reading 57751's numbers in isolation.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 57751

Top 5 sectors by establishment count in Keystone, SD

Which industries have the most business establishments in ZIP 57751.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 57751, Keystone, SD · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

844

Population

175.8

Area (sq mi)

5

People / sq mi

Denver

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 57751?

54.2

Median Age

53.8%

Male

46.2%

Female

6.0%

Foreign-Born

White 92.5%
African American 0.1%
Asian 1.6%
American Indian or Alaska Native 0.1%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 4.6%
Hispanic or Latino 9.0%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$97,969

Median Household Income

+28% vs state

$43,414

Per Capita Income

4.6%

Poverty Rate

2.9%

Unemployment Rate

How ZIP 57751 ranks nationally

Keystone, SD household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$97,969 Top 20% higher than 80% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). This entry sits in this band. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 75.3%
Bachelor's Degree or Higher 43.0%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

477

Total Housing Units

327

Occupied Units

150

Vacant Units

2.67

Avg Household Size

Occupancy Type

Owner 85.6%
Renter 14.4%

$473,500

Median Home Value

+147% vs state

$600

Median Rent

1991

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 72 business establishments in ZIP 57751, employing approximately 304 people with a combined annual payroll of $18,744,000.

72

Businesses

304

Employees

$18.7M

Annual Payroll

5

Industry Sectors

Industry Establishments % of Total
Accommodation and food services 31 43.1%
Retail trade 16 22.2%
Arts, entertainment, and recreation 8 11.1%
Transportation and warehousing 4 5.6%
Health care and social assistance 4 5.6%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

More ZIP Codes in Pennington County

57701 standard
Rapid City, SD
Pop: 43,462
57702 standard
Rapid City, SD
Pop: 32,980
57703 standard
Rapid City, SD
Pop: 14,205
57719 standard
Box Elder, SD
Pop: 6,217
57745 standard
Hill City, SD
Pop: 2,109
57761 standard
New Underwood, SD
Pop: 1,210

Related Areas

Pennington County Keystone, SD South Dakota

Frequently Asked Questions

What county is ZIP code 57751 in? ▼
ZIP code 57751 (Keystone) is located in Pennington County, South Dakota. Pennington County contains multiple ZIP codes, see the full list at /counties/pennington-sd.
What is the population of ZIP code 57751? ▼
ZIP code 57751 in Keystone, SD has a population of 844 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 57751? ▼
The median household income in ZIP 57751 is $97,969, which is 28% above the national average of $76,288.
What is the average home value in ZIP 57751? ▼
The median home value in ZIP 57751 is $473,500, which is 70% above the national average of $278,155.
What is the demographic makeup of ZIP 57751? ▼
The largest racial group in ZIP 57751 is White at 92.5%. Hispanic or Latino residents make up 9.0% of the population.
How many businesses are in ZIP code 57751? ▼
ZIP code 57751 has 72 business establishments employing approximately 304 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 57751? ▼
The top industries by establishment count in ZIP 57751 are: Accommodation and food services (31), Retail trade (16), Arts, entertainment, and recreation (8). There are 5 industry sectors represented in total.
What is the education level in ZIP code 57751? ▼
In ZIP code 57751, 75.3% of residents aged 25+ have a high school diploma or higher, and 43.0% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 57751? ▼
In ZIP code 57751, approximately 85.6% of occupied housing units are owner-occupied and 14.4% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 57751? ▼
The poverty rate in ZIP code 57751 is 4.6% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.