Mound City, SD · standard
ZIP Code 57646
Campbell County, South Dakota - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 199
- 1/sq mi
- $101,406
- Median income
- $113,300
- Median home value
- 47.0%
- Bachelor's or higher
National ZIP placement
Mound City pairs an upper-quartile household income with among the most affordable home values nationally, in a rural, homeowner-dominated area.
- Top 18%
- household income, US ZIPs
- 14th pct
- home value, US ZIPs
- 1
- people per sq mi
- 88%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 57646 against every reporting US ZIP.
ZIP code 57646 is a sparsely populated ZIP (a standard USPS delivery area) in Mound City, Campbell County, South Dakota, home to just 199 residents across 331.7 square miles, a density of 1 people per square mile, in the Chicago time zone.
ZIP 57646 lands in the middle-income range, with a median household income of $101,406 (32% above the average South Dakota ZIP), while per-capita income is $38,411. The poverty rate is 12.9%, with unemployment at 0.0%; those measures add context to the income figure. Home values sit below the statewide ZIP benchmark: the median is $113,300 (41% below the average South Dakota ZIP); owner occupancy is 88.1%.
A solid share of residents have a four-year degree: 47.0% of adults hold a bachelor's degree or higher, the median age is 37.5, and the average commute is -. The page also surfaces 1 ZIP codes within roughly 10 miles and 2 more in Campbell County, so 57646 can be compared with both its immediate and county-level context.
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 57646, Mound City, 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
199
Population
331.7
Area (sq mi)
1
People / sq mi
Chicago
Time Zone
standard
ZIP Type
Who lives in ZIP 57646?
37.5
Median Age
53.3%
Male
46.7%
Female
13.2%
Foreign-Born
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?
$101,406
Median Household Income
+32% vs state ZIP avg
$38,411
Per Capita Income
12.9%
Poverty Rate
0.0%
Unemployment Rate
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What is the education profile here?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
143housing units
143
Total Housing Units
109
Occupied Units
34
Vacant Units
2.50
Avg Household Size
Occupancy Type
$113,300
Median Home Value
-41% vs state ZIP avg
1969
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 57646, employing approximately 34 people with a combined annual payroll of $262,000.
4
Businesses
34
Employees
$262K
Annual Payroll
0
Industry Sectors
Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.
Nearby ZIP Codes
Want a side-by-side? Compare 57646 vs 57632 →
| ZIP Code | City | Population | Distance |
|---|---|---|---|
| 57632 | Herreid, SD | 634 | 10.3 mi |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 57646, both outside SD so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.