Iberville Parish area

Population and density of Iberville Parish

The Census Bureau estimates that 29,579 people lived in Iberville Parish on July 1, 2025. That ranks #1,498 of 3,222 county equivalents nationally and #34 of 64 in Louisiana. Since the April 1, 2020 estimates base of 30,246, the population has declined by 667 (−2.2%), compared with −0.9% for Louisiana as a whole.

With 617.3 square miles of land, that is 48 people per square mile (19 per km²), placing Iberville Parish #1,595 nationally for density and #33 in Louisiana. The median county equivalent has 47 people per square mile; the Louisiana median is 48. Put another way, there are about 13 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Iberville Parish

6 incorporated places lie at least partly in Iberville Parish. Together they are home to 16,435 people (55.6%); the other 13,144 (44.4%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is St. Gabriel city, with 6,987 residents in the county. The county seat, Plaquemine city, has 5,891 residents. Among places with at least 1,000 residents in 2020, St. Gabriel city grew fastest since then (+8.6%).

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Iberville Parish. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.

Metropolitan area

Iberville Parish is a central county of the Baton Rouge, LA Metropolitan Statistical Area. Its 10 county equivalents have 888,699 residents on 4,367.8 square miles of land; Iberville Parish accounts for 14.1% of the land and 3.3% of the residents. By combined land it ranks #61 of 393 metropolitan areas, and #68 by population. It belongs to the Baton Rouge-Hammond, LA Combined Statistical Area.

ZIP codes

8 ZIP Code Tabulation Areas have land in Iberville Parish, and each lies mostly inside the county.

7072170740707577076470772707767078070788

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Iberville Parish

Iberville Parish shares a land border with 7 county equivalents. It has more land than 6 of them. The largest neighbor is St. Martin Parish (737.5 mi²) and the smallest is West Baton Rouge Parish (192.3 mi²). Together with its neighbors, Iberville Parish forms a block of 3,766.9 mi² of land, of which it holds 16.4%.

How big is Iberville Parish compared with U.S. states?

Iberville Parish has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.7 times as much. Louisiana’s county land could hold about 70 areas the size of Iberville Parish.

Another way to picture it: the same land area would fill a square about 24.8 miles (40 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Iberville Parish?

Iberville Parish has more land than 1,657 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Iberville Parish at #1,566 nationally by total area, 1 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.

Its water share is 5.5%, compared with a national county-equivalent median of 1.2% — 4.3 percentage points higher. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Iberville Parish in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.