PlainZIP

Frankfort, SD · standard

ZIP Code 57440

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

612
2/sq mi
$54,625
Median income
$132,800
Median home value
26.5%
Bachelor's or higher

The verdict

Frankfort pairs one of the lowest household incomes in the country with among the most affordable home values nationally, in a rural, homeowner-dominated area.

21th pct
household income, US ZIPs
21th pct
home value, US ZIPs
2
people per sq mi
98%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 57440 against every reporting US ZIP.

ZIP code 57440 is a sparsely populated ZIP (a standard USPS delivery area) in Frankfort, Spink County, South Dakota, home to just 612 residents across 360.0 square miles, a density of 2 people per square mile, in the Chicago time zone.

ZIP 57440 reports a modest median household income of $54,625 (29% below the South Dakota average), while per-capita income is $36,929. Local economic indicators show a 18.5% poverty rate alongside 7.9% unemployment. The typical home here is valued at $132,800 (31% below the state average); renters pay a median of - monthly, and 97.5% of units are owner-occupied.

Educational attainment sits below the national norm: 26.5% of adults hold a bachelor's degree or higher, the median age is 54.5, and the average commute is -. Compare these figures to the South Dakota and national benchmarks above rather than reading 57440'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 →

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 57440, Frankfort, 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

612

Population

360.0

Area (sq mi)

2

People / sq mi

Chicago

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 57440?

54.5

Median Age

53.2%

Male

46.8%

Female

0.6%

Foreign-Born

White 99.8%
African American 0.0%
Asian 0.0%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 0.0%
Hispanic or Latino 0.4%

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?

$54,625

Median Household Income

-29% vs state

$36,929

Per Capita Income

18.5%

Poverty Rate

7.9%

Unemployment Rate

How ZIP 57440 ranks nationally

Frankfort, SD household income vs. every US ZIP code

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

$54,625 21st percentile higher than 21% 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%). This entry sits in this band. $60,000–$80,000: 9,980 US ZIPs (33%). Above this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Above this entry. $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 49.5%
Bachelor's Degree or Higher 26.5%

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

What does housing look like?

165

Total Housing Units

122

Occupied Units

43

Vacant Units

3.10

Avg Household Size

Occupancy Type

Owner 97.5%
Renter 2.5%

$132,800

Median Home Value

-31% vs state

1946

Median Year Built

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

What businesses operate in this ZIP?

Census Bureau data shows 4 business establishments in ZIP 57440, employing approximately 9 people with a combined annual payroll of $429,000.

4

Businesses

9

Employees

$429K

Annual Payroll

0

Industry Sectors

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

More ZIP Codes in Spink County

57469 standard
Redfield, SD
Pop: 3,305
57476 standard
Tulare, SD
Pop: 463
57461 standard
Mellette, SD
Pop: 392
57436 standard
Doland, SD
Pop: 384
57465 standard
Northville, SD
Pop: 371
57424 standard
Ashton, SD
Pop: 291

Related Areas

Spink County Frankfort, SD South Dakota

Frequently Asked Questions

What county is ZIP code 57440 in? ▼
ZIP code 57440 (Frankfort) is located in Spink County, South Dakota. Spink County contains multiple ZIP codes, see the full list at /counties/spink-sd.
What is the population of ZIP code 57440? ▼
ZIP code 57440 in Frankfort, SD has a population of 612 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 57440? ▼
The median household income in ZIP 57440 is $54,625, which is 28% below the national average of $76,288.
What is the average home value in ZIP 57440? ▼
The median home value in ZIP 57440 is $132,800, which is 52% below the national average of $278,155.
What is the demographic makeup of ZIP 57440? ▼
The largest racial group in ZIP 57440 is White at 99.8%. Hispanic or Latino residents make up 0.4% of the population.
How many businesses are in ZIP code 57440? ▼
ZIP code 57440 has 4 business establishments employing approximately 9 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What is the education level in ZIP code 57440? ▼
In ZIP code 57440, 49.5% of residents aged 25+ have a high school diploma or higher, and 26.5% 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 57440? ▼
In ZIP code 57440, approximately 97.5% of occupied housing units are owner-occupied and 2.5% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 57440? ▼
The poverty rate in ZIP code 57440 is 18.5% 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.