County ZIP codes · South Dakota · FIPS 46013
Brown County, SD ZIP Codes
Brown County, South Dakota has 21 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 20 residential and 1 for PO boxes or a single organization. 14 of the residential ones lie mainly in Brown County and 6 mainly in a neighboring county; 10 cross the county line. Median household income ranges from $68,835 in 57401 (Aberdeen) to $86,000 in 57451 (Ipswich) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Brown County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
They carry 20 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 20 residential ZIP codes in Brown County
14 ZIP codes lie mainly in Brown County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 57401 | Aberdeen | 31,939 | 115 | $69k | $226k | 100% |
| 57445 | Groton | 2,072 | 8 | $85k | $194k | 100% |
| 57441 | Frederick | 670 | 3 | $108k | $152k | 100% |
| 57479 | Warner | 625 | 13 | $102k | $256k | 100% |
| 57432 | Claremont | 507 | 5 | $113k | $78k | 76% |
| 57427 | Bath | 384 | 6 | $84k | $364k | 100% |
| 57449 | Houghton | 357 | 4 | $150k | – | 100% |
| 57433 | Columbia | 318 | 3 | $50k | – | 100% |
| 57481 | Westport | 271 | 1 | $68k | $216k | 56% |
| 57460 | Mansfield | 257 | 2 | $140k | $234k | 59% |
| 57474 | Stratford | 237 | 3 | $101k | $205k | 82% |
| 57446 | Hecla | 223 | 1 | $44k | $50k | 100% |
| 57426 | Barnard | 42 | 7 | $79k | – | 100% |
| 57439 | Ferney | no residents | 0 | – | – | 100% |
Partly in Brown County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 57434 | Conde | 506 | 2 | $73k | – | 17% |
| 57451 | Ipswich | 2,485 | 6 | $86k | $196k | 8% |
| 58436 | Ellendale | 1,697 | 5 | $69k | $164k | 5% |
| 57422 | Andover | 174 | 2 | $88k | – | 4% |
| 58439 | Forbes | 385 | 2 | $74k | – | 2% |
| 57461 | Mellette | 299 | 3 | $106k | $201k | 2% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
10 ZIP codes of Brown County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Brown | Elsewhere |
|---|---|---|
| 57451 | 8% | Edmunds County 92% |
| 58436 | 5% | Dickey County 95% |
| 57432 | 76% | Marshall County 24% |
| 57434 | 17% | Spink County 56%; Clark County 18%; Day County 9% |
| 58439 | 2% | Dickey County 63%; McPherson County 35% |
| 57461 | 2% | Spink County 98% |
| 57481 | 56% | McPherson County 31%; Edmunds County 12% |
| 57460 | 59% | Edmunds County 20%; Spink County 11%; Faulk County 10% |
| 57474 | 82% | Spink County 18% |
| 57422 | 4% | Day County 96% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 57402 | Aberdeen |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Brown County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Brown County's ZIP codes use 2 prefixes: 574 and 584.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.