ZIP codes in Mellette County
7 ZIPs touch Mellette County, South Dakota. The blue dashed line is the county border; orange ZIPs reach into it.
7
ZIP codes
5
cross the county line
8,401
people in these ZIPs
66
counties in SD
Most people
Mellette County ZIP list
More counties in South Dakota
- Lincoln County12
- Lyman County9
- Marshall County8
- McCook County12
- McPherson County6
- Meade County19
- Miner County9
- Minnehaha County29
- Moody County11
- Oglala Lakota County10
- Pennington County20
- Perkins County8
Questions people actually ask
How many ZIP codes are in Mellette County, South Dakota?
7 ZIP codes reach into Mellette County. 5 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Mellette County has the most people?
57580 (Winner) has about 4,386 residents, the most of any ZIP touching Mellette County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Mellette County and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Mellette County. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
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Updated 2026-11-10 · Where the data comes from