Assumption

Source:

Louisiana

Assumption is a county in Louisiana with 7 ZIP codes and a total population of 43,873. All data is sourced from the U.S. Census Bureau American Community Survey (ACS) 2023 5-Year Estimates.

Assumption is a county inside Louisiana (FIPS code 22007) that contains 7 USPS ZIP codes covering a combined population of 43,873 according to Census ACS 5-Year Estimates. Counties are the natural bridge between state-level summaries and ZIP-level detail, crime statistics, HUD Fair Market Rents, and childcare pricing are all published at the county level, while household income and housing values are published at the ZIP level. This page reconciles the two views so you can see which ZIPs drive the county totals.

The 7 ZIPs listed below are ordered by population and each links to the full ZIP detail page with Census demographics, housing, income, home-price history, and cross-agency inputs. The most populated ZIP in Assumption is 70380 covering Morgan City with 22,928 residents at 137 people per square mile. Population density across ZIPs in this county varies, use the density column to spot urban cores versus rural delivery areas. A single county can contain both a dense downtown ZIP and a large rural ZIP covering several hundred square miles.

Because Assumption uses FIPS code 22007, it joins cleanly to county-level federal datasets: HUD Fair Market Rent tables, FBI Uniform Crime Report data, and the Department of Labor National Database of Childcare Prices all key off the same code. That is how neighborhood scorecards combine ZIP-level Census demographics with county-level safety and affordability metrics. All data on this page comes from U.S. Census Bureau ACS 2023 5-Year Estimates and USPS ZIP Code Tabulation Area files, no estimates, no proprietary sources, no editorial scoring.

7

Total ZIPs

43,873

Total Population

ZIP Codes in Assumption

Side-by-side: Compare 70380 vs 70390 →

ZIP Code City Population Density
70380 Morgan City 22,928 137
70390 Napoleonville 6,969 17
70339 Pierre Part 6,033 41
70341 Belle Rose 4,449 30
70372 Labadieville 2,518 33
70393 Plattenville 774 41
70391 Paincourtville 202 101

What are common questions about ZIP codes in this county?

What is the population of Assumption?
Assumption has a total population of 43,873 across 7 ZIP codes, based on U.S. Census Bureau ACS 2023 data.
What ZIP codes are in Assumption?
Assumption includes 7 ZIP codes: 70380, 70390, 70339, 70341, 70372, 70393, 70391.
Data sources

Source: U.S. Census Bureau, American Community Survey (ACS) 5-Year Estimates (2023). Verify with Census Bureau →

Source: HUD USPS Crosswalk (ZIP-to-county mapping). Verify with HUD →

PlainZIP is not affiliated with the U.S. Census Bureau or any government agency.