First three digits · North Dakota
ZIP Codes Starting with
17 ZIP codes start with 588, sorted at the Bismarck, ND (SCF 585) sectional center (USPS labeling list L005, effective October 1, 2026) in North Dakota: 15 residential ZIP codes across 3 counties and 2 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 588 mean?
The first digit, 5, is one of ten national areas (Iowa, Minnesota, Montana, North Dakota, South Dakota and Wisconsin). The first three, 588, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 588 to the Bismarck, ND (SCF 585) facility. The last two digits pick the delivery area. By residents, the largest town names among the 588 ZIP codes are Williston, Watford City, Tioga, Ray, Alexander and Arnegard.
The same facility sorts 5 prefixes, 193 ZIP codes in all: 576, 585, 586, 587, 588.
Where are the 588 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 588
| County | ||||||
|---|---|---|---|---|---|---|
| 58801 | Williston | Williams County | 34,277 | 48 | $85k | $298k |
| 58802 | Williston | Williams County | PO Box or unique | – | – | – |
| 58803 | Williston | Williams County | PO Box or unique | – | – | – |
| 58830 | Alamo | Williams County | 66 | 0 | $54k | $163k |
| 58831 | Alexander | McKenzie County | 1,089 | 3 | $98k | $342k |
| 58833 | Ambrose | Divide County | 67 | 1 | $117k | – |
| 58835 | Arnegard | McKenzie County | 839 | 3 | $138k | $375k |
| 58838 | Cartwright | McKenzie County | 252 | 1 | $59k | $173k |
| 58843 | Epping | Williams County | 676 | 3 | $119k | $363k |
| 58844 | Fortuna | Divide County | 81 | 0 | $41k | – |
| 58845 | Grenora | Williams County | 584 | 2 | $92k | – |
| 58847 | Keene | McKenzie County | 209 | 1 | $85k | $103k |
| 58849 | Ray | Williams County | 1,101 | 4 | $82k | $270k |
| 58852 | Tioga | Williams County | 2,087 | 7 | $81k | $209k |
| 58853 | Trenton | Williams County | 354 | 24 | $108k | $311k |
| 58854 | Watford City | McKenzie County | 9,368 | 14 | $99k | $389k |
| 58856 | Zahl | Williams County | 211 | 1 | $105k | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.