County ZIP codes · Missouri · FIPS 29187
St. Francois County, MO ZIP Codes
St. Francois County, Missouri has 14 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 13 residential and 1 for PO boxes or a single organization. 8 of the residential ones lie mainly in St. Francois County and 5 mainly in a neighboring county; 10 cross the county line. Median household income ranges from $41,984 in 63624 (Bismarck) to $63,602 in 63628 (Bonne Terre) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of St. Francois County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $50,183 and $54,753.
They carry 13 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 13 residential ZIP codes in St. Francois County
8 ZIP codes lie mainly in St. Francois County; 5 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 63640 | Farmington | 29,263 | 140 | $62k | $217k | 66% |
| 63628 | Bonne Terre | 16,416 | 137 | $64k | $189k | 84% |
| 63601 | Park Hills | 16,389 | 275 | $55k | $126k | 100% |
| 63624 | Bismarck | 3,447 | 57 | $42k | $90k | 55% |
| 63653 | Leadwood | 1,186 | 1,090 | $38k | $54k | 100% |
| 63087 | Valles Mines | 1,066 | 65 | $60k | $217k | 91% |
| 63036 | French Village | 1,001 | 41 | $58k | $200k | 75% |
| 63637 | Doe Run | 759 | 38 | $55k | $153k | 100% |
Partly in St. Francois County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 63650 | Ironton | 3,600 | 32 | $50k | $123k | 22% |
| 63626 | Blackwell | 588 | 28 | $83k | $182k | 19% |
| 63645 | Fredericktown | 11,554 | 32 | $55k | $158k | 8% |
| 63648 | Irondale | 1,858 | 59 | $52k | $100k | 7% |
| 63630 | Cadet | 4,006 | 59 | $53k | $150k | 7% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
10 ZIP codes of St. Francois County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In St. Francois | Elsewhere |
|---|---|---|
| 63640 | 66% | Ste. Genevieve County 34% |
| 63628 | 84% | Ste. Genevieve County 8%; Washington County 6%; Jefferson County 2% |
| 63645 | 8% | Madison County 87%; Ste. Genevieve County 4% |
| 63630 | 7% | Washington County 93% |
| 63650 | 22% | Iron County 75%; Madison County 3% |
| 63624 | 55% | Washington County 29%; Iron County 16% |
| 63648 | 7% | Washington County 93% |
| 63087 | 91% | Jefferson County 9% |
| 63036 | 75% | Ste. Genevieve County 25% |
| 63626 | 19% | Washington County 81% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 63651 | Knob Lick |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do St. Francois County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. St. Francois County's ZIP codes use 2 prefixes: 630 and 636.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 630 | St Louis, MO (SCF 630) | 2 | 65 |
| 636 | St Louis, MO (SCF 630) | 12 | 37 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.