South Dakota
Sully County
1,481 residents11 permits TTM$70,250 median HHI2 ZIP codesUpdated April 16, 2026
Investor first look
Median home value
$198,700
ACS 5-Year
Cap rate proxy
5.5%
FMR × 0.65 ÷ Home Value
Rent-to-income
15.6%
HUD FMR ÷ ACS HHI
Net migration
—
IRS SOI
Permits (TTM)
11
Census BPS
Climate risk
6.3
FEMA NRI (0–100)
ZIP code breakdown2 ZIP codes
Numbers repeat across ZIPs in this county
ZIP-level home-value data isn't published for rural areas. Federal sources (Census ACS, HUD non-metro FMR) are available at the county level only, so home-value, cap-rate, and rent-gap numbers use the county estimate for every ZIP in the county.
| ZIP | Median home value | Rent (FMR 2BR) | Gross yield | Cap rate ↓ | Rent gap |
|---|---|---|---|---|---|
| 57520 | $198,700county est. | $948 | 5.7% | 5.5% | 3.7% |
| 57564 | $198,700county est. | $948 | 5.7% | 5.5% | 3.7% |
Sort by any column. Click a ZIP for detail. Rent gap: green = HUD FMR above market rent.
Demographics
Owner-occupied
76.1%
Census ACS
Vacancy rate
31.3%
Census ACS
Bachelor's degree +
20.9%
Census ACS
Rent burdened
12.8%
Census ACS (>30% income)
Median age
51.4
Census ACS
U.S. Census Bureau — American Community Survey 5-Year Estimates
U.S. Census Bureau — Building Permits Survey
U.S. Department of Housing and Urban Development — Fair Market Rents / Small Area Fair Market Rents (SAFMR)
Internal Revenue Service — Statistics of Income Migration Data
FEMA — National Risk Index
Last updated: April 16, 2026