County outline
Where Indiana County is located
Area breakdown
Land accounts for 99.2% of Indiana County’s measured area and water for 0.8%. Its combined area converts to 2,161 square kilometers or approximately 534,001 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 827.394 | 2,142.941 | 529,532.2 |
| Water | 6.983 | 18.086 | 4,469.1 |
| Total | 834.377 | 2,161.027 | 534,001.3 |
How Indiana County compares
By original Census land area, Indiana County ranks #20 of 67 in Pennsylvania and #1020 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 1.266 times the Pennsylvania county-equivalent median of 653.3 square miles. It accounts for 1.8% of the combined county land area in the state.
See the complete Pennsylvania ranking · What counts as a county equivalent?
Population and density of Indiana County
The Census Bureau estimates that 82,878 people lived in Indiana County on July 1, 2025. That ranks #717 of 3,222 county equivalents nationally and #34 of 67 in Pennsylvania. Since the April 1, 2020 estimates base of 83,236, the population has declined by 358 (−0.4%), compared with +0.4% for Pennsylvania as a whole.
With 827.4 square miles of land, that is 100 people per square mile (39 per km²), placing Indiana County #998 nationally for density and #40 in Pennsylvania. The median county equivalent has 47 people per square mile; the Pennsylvania median is 137. Put another way, there are about 6.4 acres of land per resident.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 83,158 | 83,115 | 82,893 | 83,045 | 83,257 | 82,878 |
| Change | — | −43 | −222 | +152 | +212 | −379 |
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 Indiana County
Indiana County is divided into 38 municipalities and townships. In Pennsylvania, county subdivisions are local governments, and together they cover all of the county’s land and residents; a few are unorganized areas without their own government.
The most populous is White township, with 14,933 residents (18% of the county). The largest by land is Green township, at 52.5 mi², or 6.3% of the county’s land. The county seat, Indiana borough, has 14,697 residents. Among those with at least 1,000 residents in 2020, Indiana borough grew fastest since then (+4.7%).
| County subdivision | Population 2025 | Since 2020 | Land mi² | Share of county land |
|---|---|---|---|---|
| White township | 14,933 | −2.7% | 42.4 | 5.1% |
| Indiana boroughCounty seat | 14,697 | +4.7% | 1.759 | 0.2% |
| Center township | 4,330 | −1.3% | 40.2 | 4.9% |
| Burrell township | 3,434 | −1.5% | 23.8 | 2.9% |
| Green township | 3,388 | −0.8% | 52.5 | 6.3% |
| Blairsville borough | 3,176 | −1.4% | 1.414 | 0.2% |
| Armstrong township | 2,747 | −0.5% | 37.6 | 4.5% |
| Rayne township | 2,738 | −1.6% | 47.1 | 5.7% |
| Cherryhill township | 2,421 | −1% | 48.6 | 5.9% |
| West Wheatfield township | 2,115 | −1.2% | 31.6 | 3.8% |
| East Wheatfield township | 2,113 | −1.3% | 27.2 | 3.3% |
| Conemaugh township | 2,043 | −0.9% | 33.7 | 4.1% |
| Pine township | 1,837 | −1% | 31 | 3.7% |
| South Mahoning township | 1,798 | −1.2% | 28.6 | 3.5% |
| Homer City borough | 1,708 | −1.3% | 0.552 | 0.1% |
Show the other 23 subdivisions
| Name | Population 2025 | Since 2020 | Land mi² |
|---|---|---|---|
| Brush Valley township | 1,672 | −0.2% | 41.3 |
| Young township | 1,670 | −1.1% | 34.8 |
| Washington township | 1,634 | −1% | 38.1 |
| Montgomery township | 1,410 | −0.8% | 28.7 |
| Canoe township | 1,407 | −1.3% | 27 |
| North Mahoning township | 1,319 | −1.1% | 28.2 |
| West Mahoning township | 1,309 | −1.1% | 28.9 |
| Clymer borough | 1,304 | −1.2% | 0.569 |
| Buffington township | 1,218 | −0.7% | 30.6 |
| Black Lick township | 1,105 | −1.3% | 27.7 |
| East Mahoning township | 954 | −0.9% | 31.3 |
| Banks township | 893 | −0.9% | 31.7 |
| Saltsburg borough | 761 | −1.4% | 0.207 |
| Grant township | 630 | −1.1% | 26.9 |
| Ernest borough | 410 | −1.7% | 0.23 |
| Marion Center borough | 404 | −1% | 0.743 |
| Creekside borough | 280 | −1.4% | 0.221 |
| Cherry Tree borough | 271 | −1.1% | 0.502 |
| Glen Campbell borough | 250 | −1.6% | 0.931 |
| Plumville borough | 247 | −1.6% | 0.496 |
| Armagh borough | 99 | −2% | 0.057 |
| Shelocta borough | 99 | −2% | 0.104 |
| Smicksburg borough | 54 | −1.8% | 0.146 |
Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Indiana County. Land: 2026 Census Gazetteer. How communities are listed.
Metropolitan area
Indiana County is a central county of the Indiana, PA Micropolitan Statistical Area. Indiana County is the area’s only county equivalent, so the micro area has the same 827.4 square miles of land. By combined land it ranks #251 of 542 micropolitan areas, and #65 by population. It belongs to the Pittsburgh-Weirton-Steubenville, PA-OH-WV Combined Statistical Area.
ZIP codes
53 ZIP Code Tabulation Areas have land in Indiana County; 46 of them have most of their land inside the county, and the others mainly cover neighboring areas.
1561815681157011570515710157121571315714157161571715720157231572415725157271572815729157311573215734157391574115742157451574615747157481575015752157541575615757157591576115763157651576715771157721577415777157831592015929159441594915954159571596116211162221624616256
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 Indiana County
Indiana County shares a land border with 5 county equivalents. It has more land than 3 of them. The largest neighbor is Clearfield County (1,144.9 mi²) and the smallest is Jefferson County (652.5 mi²). Together with its neighbors, Indiana County forms a block of 4,993.8 mi² of land, of which it holds 16.6%.
| Bordering county equivalent | Land mi² | Size vs. Indiana | Compare |
|---|---|---|---|
| Clearfield County | 1,144.9 | 1.4× larger | Compare |
| Westmoreland County | 1,027.7 | 1.2× larger | Compare |
| Cambria County | 688 | 1.2× smaller | Compare |
| Armstrong County | 653.3 | 1.3× smaller | Compare |
| Jefferson County | 652.5 | 1.3× smaller | Compare |
How big is Indiana County compared with U.S. states?
Indiana County 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. Pennsylvania’s county land could hold about 54 areas the size of Indiana County.
Another way to picture it: the same land area would fill a square about 28.8 miles (46.3 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 Indiana County?
Indiana County has more land than 2,202 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 Indiana County at #1,111 nationally by total area, 91 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 0.8%, compared with a national county-equivalent median of 1.2% — 0.3 percentage points lower. 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 Indiana County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #1019 | Clatsop County, Oregon | 828.2 | Compare |
| #1020 | Indiana County, Pennsylvania | 827.4 | This county |
| #1021 | Burke County, Georgia | 827 | Compare |
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.
Representative coordinates
The Census internal point is 40.651432, -79.087545. It represents a location inside the geography; it is not necessarily the centroid or the address of a courthouse.
Source and precision
U.S. Census Bureau, 2026 Gazetteer Files, Counties. Original ALAND: 2,142,939,354 m²; AWATER: 18,085,569 m². Rankings use ALAND; exact ties use ascending GEOID. Tables preserve Census-published square miles to three decimals, with conversions based on those values.
Common questions
How big is Indiana County?
Indiana County, Pennsylvania has 827.4 square miles (2,142.9 km²) of land and 6.983 square miles of water, for a total area of 834.4 square miles. It ranks #1020 of 3,222 U.S. county equivalents by land area.
Is Indiana County the largest county in Pennsylvania?
No. Indiana County ranks #20 of 67 in Pennsylvania by land area. The largest is Lycoming County, with 1,228.9 square miles of land.
What counties border Indiana County?
Indiana County shares a land border with Armstrong County, Westmoreland County, Cambria County, Jefferson County, and Clearfield County.
What is the population of Indiana County?
The Census Bureau estimates Indiana County had 82,878 residents on July 1, 2025, ranking #717 of 3,222 county equivalents. That is 100 people per square mile of land.
What is the county seat of Indiana County?
The county seat of Indiana County is Indiana.
What cities and towns are in Indiana County?
Indiana County has 38 county subdivisions (cities, towns and townships). The most populous five are White township, Indiana borough, Center township, Burrell township, and Green township.
Is Indiana County part of a metropolitan area?
Yes. It is a central county of the Indiana, PA Micropolitan Statistical Area.
How many ZIP codes are in Indiana County?
53 ZIP Code Tabulation Areas have land in Indiana County, and 46 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.
How does Indiana County compare with U.S. states?
It has less land than every state. Rhode Island, the smallest, has 1.2 times as much land.
How many acres of land are in Indiana County?
The land measurement converts to approximately 529,532 acres. Including water, total area is approximately 534,001 acres. One square mile equals 640 acres.
Why might another source show a different area?
Check whether it reports land or total area, its Census vintage, and its rounding. Our guide explains how to reconcile county area figures.
Can this establish a property boundary?
No. Statistical measurements and generalized maps do not establish property lines. Consult the relevant local surveying or land-records authority.