ZIP code 57421
Where is ZIP code 57421?
Amherst, South Dakota
Marshall County · Standard ZIP code
ZIP code 57421 belongs to Amherst, South Dakota in Marshall County. 57421 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Central Time zone and uses area code 605. About 75 people live in the 57421 area. The closest ZIP codes are 57432 (Claremont, 8.4 mi southwest), 57449 (Houghton, 8.5 mi west) and 57430 (Britton, 9.4 mi east).
| ZIP code | 57421 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Amherst |
| State | South Dakota (SD) |
| County | Marshall County |
| Time zone | Central Time · now |
| Area code | 605 |
| Coordinates | 45.7585, -97.9274 map |
| 3-digit prefix | 574 |
Population and income in 57421
| Population | 75 · lower than 96% of South Dakota ZIP codes |
|---|---|
| People per square mile | 2 · lower than 76% of South Dakota ZIP codes |
| Median age | 16.6 years · lower than 99% of South Dakota ZIP codes |
| Men / women | 40% / 60% |
| Income per person | $33,005 |
| Below the poverty line | 0.0% |
| Bachelor’s degree or higher | 91% of adults 25+ |
| Housing units | 26 |
| Households | 18 (4.17 people on average) |
| Owners / renters | 100% / 0.0% |
| Land area | 33.34 sq mi (plus 0.09 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 57421. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 57421
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 57432 | Claremont, SD | 8.4 mi SW | Standard |
| 57449 | Houghton, SD | 8.5 mi W | Standard |
| 57430 | Britton, SD | 9.4 mi E | Standard |
| 57454 | Langford, SD | 11.7 mi SE | Standard |
| 57446 | Hecla, SD | 15 mi NW | Standard |
| 57468 | Pierpont, SD | 19 mi S | Standard |
| 57433 | Columbia, SD | 20.2 mi W | Standard |
| 58043 | Havana, ND | 20.9 mi NE | Standard |
| 58017 | Cogswell, ND | 21.9 mi N | Standard |
| 57445 | Groton, SD | 23 mi S | Standard |
| 57422 | Andover, SD | 23.2 mi S | Standard |
| 57402 | Aberdeen, SD | 23.6 mi SW | PO Box only |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 57421 or measure the distance to another ZIP code.
How to address mail to 57421
123 MAIN ST
AMHERST SD 57421
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (57421-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 57421?
- 57421 is a Amherst, South Dakota ZIP code.
- What county is 57421 in?
- ZIP code 57421 is in Marshall County, South Dakota.
- What time zone is ZIP code 57421 in?
- 57421 is in the Central Time zone (America/Chicago).
- What area code is 57421?
- Phone numbers in ZIP code 57421 use area code 605.
- What is the population of ZIP code 57421?
- About 75 people live in ZIP code 57421, according to the Census Bureau’s American Community Survey (2020–2024).
- What ZIP codes are near 57421?
- The nearest ZIP codes to 57421 are 57432 (Claremont, 8.4 miles), 57449 (Houghton, 8.5 miles), 57430 (Britton, 9.4 miles) and 57454 (Langford, 11.7 miles).