Collier County area

Population and density of Collier County

The Census Bureau estimates that 417,131 people lived in Collier County on July 1, 2025. That ranks #186 of 3,222 county equivalents nationally and #19 of 67 in Florida. Since the April 1, 2020 estimates base of 375,763, the population has grown by 41,368 (+11%), compared with +8.9% for Florida as a whole.

With 1,997 square miles of land, that is 209 people per square mile (81 per km²), placing Collier County #622 nationally for density and #34 in Florida. The median county equivalent has 47 people per square mile; the Florida median is 209. Put another way, there are about 3.1 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 Collier County

3 incorporated places lie at least partly in Collier County. Together they are home to 36,934 people (8.9%); the other 380,197 (91.1%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Naples city, with 20,114 residents in the county. Among places with at least 1,000 residents in 2020, Naples city grew fastest since then (+5.2%).

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

Metropolitan area

Collier County is a central county of the Naples-Marco Island, FL Metropolitan Statistical Area. Collier County is the area’s only county equivalent, so the metro area has the same 1,997 square miles of land. By combined land it ranks #158 of 393 metropolitan areas, and #136 by population. It belongs to the Cape Coral-Fort Myers-Naples, FL Combined Statistical Area.

ZIP codes

24 ZIP Code Tabulation Areas have land in Collier County; 22 of them have most of their land inside the county, and the others mainly cover neighboring areas.

341013410234103341043410534108341093411034112341133411434116341173411934120341343413534137341383413934140341413414234145

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 Collier County

Collier County shares a land border with 5 county equivalents. It has more land than every one of them. The largest neighbor is Miami-Dade County (1,900 mi²) and the smallest is Lee County (781.2 mi²). Together with its neighbors, Collier County forms a block of 8,020.2 mi² of land, of which it holds 24.9%.

How big is Collier County compared with U.S. states?

Collier County has more land than 2 of the 50 states. It is about 1 times the land area of Delaware (1,948.6 mi²), while Connecticut, the next larger state, has 2.4 times as much land (4,842.5 mi²). Florida’s county land could hold about 27 areas the size of Collier County.

Another way to picture it: the same land area would fill a square about 44.7 miles (71.9 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 Collier County?

Collier County has more land than 2,934 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 Collier County at #221 nationally by total area, 67 places closer to the top than its land rank. The water assigned to this geography moves it ahead of some county equivalents with more land.

Its water share is 23.3%, compared with a national county-equivalent median of 1.2% — 22.2 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 Collier County 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.