County ZIP codes · Missouri · FIPS 29099
Jefferson County, MO ZIP Codes
Jefferson County, Missouri has 28 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 25 residential and 3 for PO boxes or a single organization. 16 of the residential ones lie mainly in Jefferson County and 9 mainly in a neighboring county; 13 cross the county line. Median household income ranges from $63,602 in 63628 (Bonne Terre) to $125,676 in 63025 (Eureka) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Jefferson 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 $78,185 and $92,333.
They carry 25 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 25 residential ZIP codes in Jefferson County
16 ZIP codes lie mainly in Jefferson County; 9 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 63026 | Fenton | 45,354 | 1,792 | $98k | $294k | 50% |
| 63010 | Arnold | 34,478 | 1,604 | $80k | $224k | 100% |
| 63052 | Imperial | 28,712 | 868 | $93k | $285k | 100% |
| 63028 | Festus | 28,457 | 226 | $80k | $240k | 83% |
| 63020 | De Soto | 20,166 | 135 | $71k | $186k | 94% |
| 63050 | Hillsboro | 18,744 | 204 | $87k | $288k | 100% |
| 63049 | High Ridge | 16,592 | 666 | $92k | $225k | 80% |
| 63051 | House Springs | 13,436 | 312 | $80k | $202k | 100% |
| 63012 | Barnhart | 10,314 | 410 | $96k | $251k | 100% |
| 63070 | Pevely | 8,428 | 560 | $65k | $211k | 100% |
| 63016 | Cedar Hill | 6,459 | 232 | $86k | $230k | 100% |
| 63023 | Dittmer | 5,002 | 78 | $80k | $213k | 100% |
| 63019 | Crystal City | 4,489 | 1,334 | $73k | $186k | 100% |
| 63048 | Herculaneum | 4,228 | 1,168 | $92k | $232k | 100% |
| 63053 | Kimmswick | 56 | 1,931 | $61k | $221k | 100% |
| 63047 | Hematite | no residents | 0 | – | – | 100% |
Partly in Jefferson County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 63025 | Eureka | 19,508 | 467 | $126k | $392k | 43% |
| 63015 | Catawissa | 1,939 | 120 | $89k | $237k | 35% |
| 63069 | Pacific | 15,697 | 229 | $78k | $292k | 24% |
| 63087 | Valles Mines | 1,066 | 65 | $60k | $217k | 9% |
| 63030 | Fletcher | 557 | 70 | $91k | $183k | 6% |
| 63627 | Bloomsdale | 2,787 | 38 | $88k | $267k | 6% |
| 63072 | Robertsville | 3,469 | 84 | $80k | $241k | 3% |
| 63041 | Grubville | 309 | 24 | $69k | $397k | 2% |
| 63628 | Bonne Terre | 16,416 | 137 | $64k | $189k | 2% |
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?
13 ZIP codes of Jefferson County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Jefferson | Elsewhere |
|---|---|---|
| 63026 | 50% | St. Louis County50% |
| 63028 | 83% | Ste. Genevieve County16% |
| 63020 | 94% | Washington County6% |
| 63025 | 43% | St. Louis County57% |
| 63049 | 80% | St. Louis County20% |
| 63628 | 2% | St. Francois County84%; Ste. Genevieve County8%; Washington County6% |
| 63069 | 24% | Franklin County43%; St. Louis County33% |
| 63072 | 3% | Franklin County97% |
| 63627 | 6% | Ste. Genevieve County94% |
| 63015 | 35% | Franklin County65% |
| 63087 | 9% | St. Francois County91% |
| 63030 | 6% | Washington County94% |
| 63041 | 2% | Franklin County98% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 63057 | Liguori |
| 63065 | Mapaville |
| 63066 | Morse Mill |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Jefferson County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Jefferson County's ZIP codes use 2 prefixes: 630 and 636.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.