County ZIP codes · Louisiana · FIPS 22099
St. Martin Parish, LA ZIP Codes
St. Martin Parish, Louisiana has 9 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 8 residential and 1 for PO boxes or a single organization. 3 of the residential ones lie mainly in St. Martin Parish and 5 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $45,509 in 70560 (New Iberia) to $106,710 in 70518 (Broussard) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of St. Martin 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 $47,313 and $54,595.
They carry 8 postal town names: New Iberia, Breaux Bridge, Morgan City, Saint Martinville, Broussard, Arnaudville, Pierre Part, Cade.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 8 residential ZIP codes in St. Martin Parish
3 ZIP codes lie mainly in St. Martin Parish; 5 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 70517 | Breaux Bridge | 26,024 | 154 | $61k | $162k | 99% |
| 70582 | Saint Martinville | 19,209 | 130 | $50k | $163k | 94% |
| 70519 | Cade | 71 | 108 | – | – | 100% |
Partly in St. Martin Parish
| In this county | ||||||
|---|---|---|---|---|---|---|
| 70518 | Broussard | 17,263 | 414 | $107k | $298k | 45% |
| 70512 | Arnaudville | 10,740 | 110 | $47k | $167k | 39% |
| 70380 | Morgan City | 20,529 | 264 | $55k | $142k | 29% |
| 70339 | Pierre Part | 4,848 | 88 | $52k | $171k | 13% |
| 70560 | New Iberia | 36,996 | 210 | $46k | $134k | 1% |
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?
7 ZIP codes of St. Martin Parish extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In St. Martin | Elsewhere |
|---|---|---|
| 70560 | 1% | Iberia Parish 98%; Vermilion Parish 1% |
| 70517 | 99% | Lafayette Parish 1% |
| 70380 | 29% | Assumption Parish 39%; St. Mary Parish 32% |
| 70582 | 94% | Iberia Parish 6% |
| 70518 | 45% | Lafayette Parish 51%; Iberia Parish 3% |
| 70512 | 39% | St. Landry Parish 61% |
| 70339 | 13% | Assumption Parish 87% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 70521 | Cecilia |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do St. Martin Parish's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. St. Martin Parish's ZIP codes use 2 prefixes: 703 and 705.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 703 | New Orleans, LA (SCF 700) | 2 | 38 |
| 705 | Lafayette, LA (SCF 705) | 7 | 75 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.