County ZIP codes · Louisiana · FIPS 22103
St. Tammany Parish, LA ZIP Codes
St. Tammany Parish, Louisiana has 22 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 18 residential and 4 for PO boxes or a single organization. 16 of the residential ones lie mainly in St. Tammany Parish and 2 mainly in a neighboring county; 6 cross the county line. Median household income ranges from $38,074 in 70427 (Bogalusa) to $122,574 in 70447 (Madisonville) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of St. Tammany Parish?
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 $62,917 and $89,003.
They carry 14 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 18 residential ZIP codes in St. Tammany Parish
16 ZIP codes lie mainly in St. Tammany Parish; 2 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 70433 | Covington | 41,876 | 861 | $81k | $325k | 93% |
| 70458 | Slidell | 39,034 | 1,869 | $73k | $238k | 100% |
| 70461 | Slidell | 34,808 | 650 | $89k | $274k | 100% |
| 70448 | Mandeville | 26,338 | 1,200 | $96k | $340k | 100% |
| 70471 | Mandeville | 24,199 | 837 | $97k | $394k | 100% |
| 70435 | Covington | 22,475 | 216 | $81k | $282k | 96% |
| 70460 | Slidell | 21,669 | 564 | $63k | $193k | 100% |
| 70447 | Madisonville | 17,897 | 578 | $123k | $393k | 100% |
| 70452 | Pearl River | 12,650 | 128 | $63k | $233k | 100% |
| 70445 | Lacombe | 9,288 | 86 | $78k | $208k | 100% |
| 70437 | Folsom | 8,030 | 93 | $61k | $299k | 76% |
| 70420 | Abita Springs | 7,950 | 125 | $78k | $291k | 100% |
| 70431 | Bush | 5,769 | 83 | $70k | $246k | 94% |
| 70457 | Saint Benedict | 143 | 3,043 | – | – | 100% |
| 70464 | Talisheek | 109 | 32 | – | – | 100% |
| 70463 | Sun | 99 | 114 | $26k | $134k | 100% |
Partly in St. Tammany Parish
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?
6 ZIP codes of St. Tammany Parish extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In St. Tammany | Elsewhere |
|---|---|---|
| 70433 | 93% | Tangipahoa Parish 7% |
| 70435 | 96% | Tangipahoa Parish 4% |
| 70438 | 3% | Washington Parish 96% |
| 70427 | 10% | Washington Parish 90% |
| 70437 | 76% | Tangipahoa Parish 24% |
| 70431 | 94% | Washington Parish 6% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do St. Tammany Parish's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of St. Tammany Parish starts with 704.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 704 | New Orleans, LA (SCF 700) | 22 | 47 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.