Union Parish area

Population and density of Union Parish

The Census Bureau estimates that 20,561 people lived in Union Parish on July 1, 2025. That ranks #1,857 of 3,222 county equivalents nationally and #42 of 64 in Louisiana. Since the April 1, 2020 estimates base of 21,110, the population has declined by 549 (−2.6%), compared with −0.9% for Louisiana as a whole.

With 876.9 square miles of land, that is 23 people per square mile (9.1 per km²), placing Union Parish #2,187 nationally for density and #54 in Louisiana. The median county equivalent has 47 people per square mile; the Louisiana median is 48. Put another way, there are about 27 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 Union Parish

7 incorporated places lie at least partly in Union Parish. Together they are home to 5,970 people (29%); the other 14,591 (71%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Farmerville town, with 3,432 residents in the county.

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

Metropolitan area

Union Parish is an outlying county of the Monroe, LA Metropolitan Statistical Area. Its 4 county equivalents have 222,390 residents on 2,837.6 square miles of land; Union Parish accounts for 30.9% of the land and 9.2% of the residents. By combined land it ranks #103 of 393 metropolitan areas, and #220 by population. It belongs to the Monroe-Ruston, LA Combined Statistical Area.

ZIP codes

10 ZIP Code Tabulation Areas have land in Union Parish; 7 of them have most of their land inside the county, and the others mainly cover neighboring areas.

71222712277123471235712417125671260712777128071749

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Union Parish

Union Parish shares a land border with 5 county equivalents, including 1 in Arkansas. It has more land than 4 of them. The largest neighbor is Union County (1,039.1 mi²) and the smallest is Lincoln Parish (471.6 mi²). Together with its neighbors, Union Parish forms a block of 4,547.5 mi² of land, of which it holds 19.3%.

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

Union Parish has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.2 times as much. Louisiana’s county land could hold about 49 areas the size of Union Parish.

Another way to picture it: the same land area would fill a square about 29.6 miles (47.7 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 Union Parish?

Union Parish has more land than 2,303 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 Union Parish at #949 nationally by total area, 30 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 3.1%, compared with a national county-equivalent median of 1.2% — 2 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 Union 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.