Polk County area

Population and density of Polk County

The Census Bureau estimates that 874,790 people lived in Polk County on July 1, 2025. That ranks #73 of 3,222 county equivalents nationally and #9 of 67 in Florida. Since the April 1, 2020 estimates base of 725,042, the population has grown by 149,748 (+20.7%), compared with +8.9% for Florida as a whole.

With 1,798.8 square miles of land, that is 486 people per square mile (188 per km²), placing Polk County #344 nationally for density and #18 in Florida. The median county equivalent has 47 people per square mile; the Florida median is 209. Put another way, there are about 1.3 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 Polk County

17 incorporated places lie at least partly in Polk County. Together they are home to 358,635 people (41%); the other 516,155 (59%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Lakeland city, with 125,520 residents in the county. The county seat, Bartow city, has 23,617 residents. Among places with at least 1,000 residents in 2020, Eagle Lake city grew fastest since then (+112.7%).

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

Metropolitan area

Polk County is a central county of the Lakeland-Winter Haven, FL Metropolitan Statistical Area. Polk County is the area’s only county equivalent, so the metro area has the same 1,798.8 square miles of land. By combined land it ranks #175 of 393 metropolitan areas, and #74 by population. It belongs to the Orlando-Lakeland-Deltona, FL Combined Statistical Area.

ZIP codes

45 ZIP Code Tabulation Areas have land in Polk County; 40 of them have most of their land inside the county, and the others mainly cover neighboring areas.

335473380133803338053380933810338113381233813338153382333825338273383033834338353383733838338393384033841338433384433847338493385033851338533385433855338563385833859338603386733868338773388033881338843389633897338983471434759

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 Polk County

Polk County shares a land border with 7 county equivalents. It has more land than every one of them. The largest neighbor is Osceola County (1,327.3 mi²) and the smallest is Sumter County (557.1 mi²). Together with its neighbors, Polk County forms a block of 8,061.4 mi² of land, of which it holds 22.3%.

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

Polk County has more land than 1 of the 50 states. It is about 1.7 times the land area of Rhode Island (1,033.9 mi²), while Delaware, the next larger state, has 1.1 times as much land (1,948.6 mi²). Florida’s county land could hold about 30 areas the size of Polk County.

Another way to picture it: the same land area would fill a square about 42.4 miles (68.3 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 Polk County?

Polk County has more land than 2,894 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 Polk County at #317 nationally by total area, 11 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 10.5%, compared with a national county-equivalent median of 1.2% — 9.4 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 Polk 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.