58643 ZIP Code: Marmarth, North Dakota
ZIP code 58643 covers Marmarth, North Dakota. It sits in Slope County. A ZIP code is a US Postal Service mail route, not a boundary on a map, so it describes where post is delivered rather than an administrative area.
| ZIP code | 58643 |
|---|---|
| Place | Marmarth |
| State | North Dakota (ND) |
| County or equivalent | Slope County |
| Phone area codes in North Dakota | 1 |
| Country | United States |
Phone area codes in North Dakota
ZIP codes and area codes are separate systems drawn for different purposes, so no ZIP code maps to exactly one area code. These are every geographic code used across North Dakota.
ZIP codes near 58643
- 58651 Rhameabout 14 miles
- 59313 Baker, MTabout 19 miles
- 59354 Willard, MTabout 25 miles
- 58623 Bowmanabout 25 miles
- 58632 Golvaabout 27 miles
- 58620 Amidonabout 31 miles
- 59344 Plevna, MTabout 33 miles
- 58654 Sentinel Butteabout 35 miles
Distances are straight-line, between the approximate centres of each delivery area.
Got a call from a North Dakota number?
Enter the full 10-digit number to see who it is listed to, where it is registered, and whether it is a mobile, landline or VoIP line.
Frequently asked questions
Where is ZIP code 58643?
ZIP code 58643 is in Marmarth, North Dakota, in Slope County. ZIP codes are mail delivery routes rather than mapped regions, so the code identifies a set of addresses the Postal Service serves together, not a district with fixed borders.
What county is 58643 in?
58643 is in Slope County, North Dakota. A single ZIP code can straddle a county line, because mail routes were drawn for delivery efficiency and take no notice of county boundaries, so the county shown is the one the code is primarily associated with.
What area code goes with ZIP code 58643?
ZIP codes and telephone area codes are separate systems with different boundaries, so no ZIP code maps to exactly one area code. North Dakota uses 1 geographic area code: 701.
Is 58643 a real ZIP code?
Yes. 58643 appears in the GeoNames postal-code dataset as an active US code assigned to Marmarth, North Dakota. Codes that have been retired or never issued do not appear, which is why entering one on this site returns a not-found page rather than a blank record.
Why do ZIP code boundaries look odd on maps?
Because they are not boundaries. A ZIP code is a collection of mail routes, and a route is a line a carrier walks or drives, not an area. Any ZIP code map you have seen is somebody's approximation drawn around the addresses in a code, which is also why two ZIP code maps rarely agree with each other.
Can two addresses in the same ZIP code be in different cities?
Yes, routinely. The Postal Service assigns a preferred city name to each code for addressing purposes, and that name often covers several neighbouring towns, unincorporated areas or a whole postal district. The place shown here is the one the source names for the code, not a claim that every address in it is inside that town's limits.
ZIP code, place, county and location data from GeoNames, used under CC BY 4.0, extracted 2026-08-22. ZIP codes are Postal Service delivery routes, not administrative areas, so a code can cross city and county lines and the place name shown is the one the source records for the code. Coordinates are an approximate centre of the delivery area, not a precise location. Population and time zone are not shown because the source does not publish them.