First three digits · Montana
ZIP Codes Starting with
24 ZIP codes start with 596, sorted at the Great Falls, MT (SCF 594) sectional center (USPS labeling list L005, effective October 1, 2026) in Montana: 19 residential ZIP codes across 4 counties and 5 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 596 mean?
The first digit, 5, is one of ten national areas (Iowa, Minnesota, Montana, North Dakota, South Dakota and Wisconsin). The first three, 596, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 596 to the Great Falls, MT (SCF 594) facility. The last two digits pick the delivery area. By residents, the largest town names among the 596 ZIP codes are Helena, East Helena, Clancy, Townsend, Boulder and White Sulphur Springs.
The same facility sorts 3 prefixes, 111 ZIP codes in all: 594, 595, 596.
Where are the 596 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 596
| County | ||||||
|---|---|---|---|---|---|---|
| 59601 | Helena | Lewis and Clark County | 31,728 | 244 | $72k | $387k |
| 59602 | Helena | Lewis and Clark County | 30,754 | 59 | $93k | $409k |
| 59604 | Helena | Lewis and Clark County | PO Box or unique | – | – | – |
| 59620 | Helena | Lewis and Clark County | PO Box or unique | – | – | – |
| 59623 | Helena | Lewis and Clark County | no residents | 0 | – | – |
| 59624 | Helena | Lewis and Clark County | PO Box or unique | – | – | – |
| 59625 | Helena | Lewis and Clark County | 663 | 7,286 | – | – |
| 59626 | Helena | Lewis and Clark County | PO Box or unique | – | – | – |
| 59631 | Basin | Jefferson County | 375 | 2 | – | $236k |
| 59632 | Boulder | Jefferson County | 2,557 | 6 | $69k | $279k |
| 59633 | Canyon Creek | Lewis and Clark County | 272 | 1 | – | $414k |
| 59634 | Clancy | Jefferson County | 5,521 | 22 | $130k | $554k |
| 59635 | East Helena | Lewis and Clark County | 8,292 | 104 | $84k | $396k |
| 59636 | Fort Harrison | Lewis and Clark County | 32 | 10 | – | – |
| 59638 | Jefferson City | Jefferson County | 769 | 13 | $127k | – |
| 59639 | Lincoln | Lewis and Clark County | 1,021 | 2 | $58k | $372k |
| 59640 | Marysville | Lewis and Clark County | 160 | 8 | $99k | $288k |
| 59641 | Radersburg | Broadwater County | PO Box or unique | – | – | – |
| 59642 | Ringling | Meagher County | 35 | 0 | $46k | – |
| 59643 | Toston | Broadwater County | 867 | 3 | $50k | $355k |
| 59644 | Townsend | Broadwater County | 4,187 | 6 | $69k | $362k |
| 59645 | White Sulphur Springs | Meagher County | 1,611 | 1 | $77k | $288k |
| 59647 | Winston | Broadwater County | 358 | 4 | – | $337k |
| 59648 | Wolf Creek | Lewis and Clark County | 486 | 1 | $66k | $264k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.