First three digits · Missouri
ZIP Codes Starting with
37 ZIP codes start with 636, sorted at the St Louis, MO (SCF 630) sectional center (USPS labeling list L005, effective October 1, 2026) in Missouri: 34 residential ZIP codes across 9 counties and 3 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 636 mean?
The first digit, 6, is one of ten national areas (Illinois, Kansas, Missouri and Nebraska). The first three, 636, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 636 to the St Louis, MO (SCF 630) facility. The last two digits pick the delivery area. By residents, the largest town names among the 636 ZIP codes are Farmington, Bonne Terre, Park Hills, Sainte Genevieve, Fredericktown and Potosi.
The same facility sorts 12 prefixes, 714 ZIP codes in all: 620, 622, 628, 629, 630, 631, 633, 634, 636, 637, 638, 639.
Where are the 636 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 636
| County | ||||||
|---|---|---|---|---|---|---|
| 63601 | Park Hills | St. Francois County | 16,389 | 275 | $55k | $126k |
| 63620 | Annapolis | Iron County | 1,036 | 5 | $42k | $203k |
| 63621 | Arcadia | Iron County | 1,632 | 21 | $88k | $175k |
| 63622 | Belgrade | Washington County | 764 | 17 | $32k | – |
| 63623 | Belleview | Iron County | 895 | 8 | $45k | $141k |
| 63624 | Bismarck | St. Francois County | 3,447 | 57 | $42k | $90k |
| 63625 | Black | Reynolds County | 382 | 5 | – | $211k |
| 63626 | Blackwell | Washington County | 588 | 28 | $83k | $182k |
| 63627 | Bloomsdale | Ste. Genevieve County | 2,787 | 38 | $88k | $267k |
| 63628 | Bonne Terre | St. Francois County | 16,416 | 137 | $64k | $189k |
| 63629 | Bunker | Shannon County | 947 | 3 | $47k | $104k |
| 63630 | Cadet | Washington County | 4,006 | 59 | $53k | $150k |
| 63631 | Caledonia | Washington County | 544 | 13 | $74k | $128k |
| 63632 | Cascade | Wayne County | PO Box or unique | – | – | – |
| 63633 | Centerville | Reynolds County | 775 | 8 | $53k | $158k |
| 63636 | Des Arc | Iron County | 446 | 10 | $65k | $65k |
| 63637 | Doe Run | St. Francois County | 759 | 38 | $55k | $153k |
| 63638 | Ellington | Reynolds County | 2,489 | 8 | $55k | $138k |
| 63640 | Farmington | St. Francois County | 29,263 | 140 | $62k | $217k |
| 63645 | Fredericktown | Madison County | 11,554 | 32 | $55k | $158k |
| 63648 | Irondale | Washington County | 1,858 | 59 | $52k | $100k |
| 63650 | Ironton | Iron County | 3,600 | 32 | $50k | $123k |
| 63651 | Knob Lick | St. Francois County | PO Box or unique | – | – | – |
| 63653 | Leadwood | St. Francois County | 1,186 | 1,090 | $38k | $54k |
| 63654 | Lesterville | Reynolds County | 752 | 11 | $37k | $188k |
| 63655 | Marquand | Madison County | 1,639 | 11 | $62k | $176k |
| 63656 | Middle Brook | Iron County | 576 | 8 | $47k | $102k |
| 63660 | Mineral Point | Washington County | 2,784 | 79 | $51k | $120k |
| 63662 | Patton | Bollinger County | 536 | 9 | $55k | – |
| 63663 | Pilot Knob | Iron County | 649 | 827 | $45k | $109k |
| 63664 | Potosi | Washington County | 9,693 | 34 | $61k | $125k |
| 63665 | Redford | Reynolds County | 313 | 4 | $28k | $126k |
| 63666 | Reynolds | Reynolds County | PO Box or unique | – | – | – |
| 63670 | Sainte Genevieve | Ste. Genevieve County | 12,293 | 49 | $63k | $213k |
| 63673 | Saint Mary | Ste. Genevieve County | 2,340 | 20 | $78k | $236k |
| 63674 | Tiff | Washington County | 48 | 17 | – | – |
| 63675 | Vulcan | Iron County | 24 | 2 | $16k | $563k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.