| ZIP Codes: | 6 ZIP Codes (5 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 225 / 985 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:23 PM |
| Population: | 17,783 [See All] |
| FIPS: | 22007 |
| CBSA: | Baton Rouge, LA |
| Land Area: | 437 sq mi |
| Water Area: | 26 sq mi |
| Coordinates: | 29.9290, -91.0585 |
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17,783 residents live across 6 ZIPs covering 437 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 21,038 to 17,783 from 2014 to 2024 — a -15.5% change. 0 ZIPs gained residents, 6 lost.
The parish's wealthiest ZIP 70390 (Napoleonville, $58,667 median) and poorest ZIP 70393 (Plattenville, $19,256) are 8.0 miles apart — a 3.0× income gap across local geography.
Median home values vary 2.4× across this parish — from $88,500 in 70341 (Belle Rose) to $214,900 in 70393 (Plattenville).
Density varies 4× across the parish — from 27 people/sq mi in 70339 (Pierre Part) to 106 in 70393 (Plattenville).
Educational attainment ranges from 6.1% bachelor's+ in 70372 (Labadieville) to 18.8% in 70341 (Belle Rose) — the breadth of educational profiles across the area.
Within Louisiana, this is the #48 most populous of 64 parishes and ranks #62 for median household income .
Weighted by population, the typical household earns about $49,665 across the parish — reflecting what a typical resident sees, not a simple ZIP average.
13.5% of adults age 25+ hold a bachelor's degree or higher (1,717 of 12,714 reporting).
5 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this parish.
Median household income spans 3.0× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
Assumption Parish lost 15.5% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 70390 | Napoleonville | Standard | 7,160 | $58,667 | 171.1 | -2.1% |
| 70339 | Pierre Part | Standard | 4,848 | $51,659 | 181.3 | -20.1% |
| 70341 | Belle Rose | Standard | 3,690 | $35,346 | 48.0 | -14.8% |
| 70372 | Labadieville | Standard | 1,968 | $40,659 | 35.2 | -18.7% |
| 70393 | Plattenville | Standard | 117 | $19,256 | 1.1 | -83.3% |
| 70391 | Paincourtville | PO Box | 0 | — | 0.0 | -100.0% |