Residential delivery area · South Dakota
ZIP Code 57730: Custer, SD
ZIP code 57730 uses the postal name Custer, South Dakota and lies mostly in Custer County (92% of its land) with the rest in Pennington County (Census 2020 ZIP-county file). About 5,600 people live there (Census Bureau, ACS 2020-2024). Median household income is $83,469 (Census Bureau, ACS 2020-2024). By Census place, under 1% of its land lies in Custer; more than 99% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Custer · its only residential ZIP
- County
- Custer County (92%); Pennington County (8%)
- Census places
- Custer
- Metro area
- Rapid City, SD
- House district
- SD at large 119th Congress
- State
- South Dakota
- Time zone
- Mountain
- Land area
- 516.2 sq mi · 11 people per sq mi
Where is ZIP code 57730?
57730 centers on 43.727°, -103.649° and covers 516.2 square miles of land plus 0.6 of water. It borders 9 ZIP codes: 57773, 57751, 57745, 57738, 57747, 57744, 57735, 57722, 82701.
The map draws ZIP code areas only. For the streets inside 57730, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 57730 compare with the rest of Custer County?
| Measure | 57730 | In Custer County | In SD |
|---|---|---|---|
| People (ACS 2020-2024) | 5,596 | 2nd of 9 | 30th of 375 |
| Median household income | $84k | 2nd of 4 | 38th of 107 |
| Median home value | $379k | 2nd of 5 | 8th of 109 |
Its median household income is higher than in 66% of U.S. residential ZIP codes, and it is denser than 18% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 57730?
The 2020 Census counted 5,219 people in 57730; the ACS, which samples households over 2020-2024, estimates 5,596. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 5,596
- 2020 Census count
- 5,219
- Households
- 2,733
- Median age
- 57.9
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 57730?
Of the 5,596 people the ACS estimates in 57730, 13.6% are under 18 and 36.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (86.8%), then Other or two or more (10.0%).
- Under 1813.6%
- 18 to 6450.0%
- 65 and older36.4%
- White, not Hispanic86.8%
- Other or two or more10.0%
- Hispanic or Latino2.3%
- Asian, not Hispanic0.6%
- Black, not Hispanic0.3%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 57730 earn?
Median household income is $83,469 (ACS 2020-2024), the 2nd highest of the 4 ranked ZIP codes in Custer County.
- Median household income
- $83,469
- Income per person
- $50,472
- Below the poverty line
- 10.0%
- Unemployed (of the labor force)
- 1.8%
- Adults 25+ with a bachelor's degree
- 34.0%
- Adjusted gross income per tax return, 2022
- $92,3462,880 returns; wages 43% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 57730?
FHFA's house price index for 57730, built from repeat sales and appraisals of the same homes, rose 144% from 2015 to 2025 and rose 96% from 2020 to 2025, and moved +9.7% in 2025.
- Median home value (owners' estimate)
- $378,800
- Median gross rent
- $1,087
- Homes owned by their occupants
- 80.4%
- Housing units
- 3,346
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 57730?
242 business establishments had a location in this ZIP code in 2023, 5 more than in 2018; the most are in accommodation and food services (ZIP Code Business Patterns).
- Accommodation and food services55
- Construction33
- Retail trade28
- Other services (except public administration)19
- Health care and social assistance18
- Professional, scientific, and technical services17
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 57730?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 57773 | Pringle | 206 | – | 9.6 mi |
| 57751 | Keystone | 893 | $98k | 14.8 mi |
| 57745 | Hill City | 1,894 | $88k | 21.0 mi |
| 57738 | Fairburn | 356 | $52k | 24.6 mi |
| 57747 | Hot Springs | 5,839 | $68k | 25.2 mi |
| 57744 | Hermosa | 2,421 | $106k | 31.0 mi |
| 57735 | Edgemont | 1,727 | $72k | 32.0 mi |
| 57722 | Buffalo Gap | 177 | $59k | 38.5 mi |
| 82701 | Newcastle, WY | 5,459 | $91k | 40.5 mi |
| 57702 | Rapid City | 35,595 | $92k | 24.1 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.