County Maps US

Porter County, Indiana

A county in Indiana, ranked 10 of 92 by population.

CountyFIPS 18127

Within Indiana
Porter County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Valparaiso, the county seat, located via the 2025 Census Gazetteer.

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Population
176,049
+2,730 (+1.6%) since 2020
Land area
418.1
square miles. A further 19.9% of the total area is water
Population density
421
people per square mile, computed rather than published
County seat
Valparaiso
Seat of county government.
Established
1835
190 years ago
Largest city
Portage city
Population 38,634.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Porter County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Porter County, Indiana from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 406 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Porter County ranks

Position among the 92 counties of Indiana, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IndianaNationally
Population176,04910th of 92398th of 3,144
Land area418.1 sq mi29th of 922,423rd of 3,144
Population density421 per sq mi11th of 92332nd of 3,144
Median household income$87,9727th of 92350th of 3,143

Full data for Porter County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population176,049Vintage 2025 Population Estimates
Population in 2020173,319Vintage 2025 Population Estimates
2020 estimates base?173,222Vintage 2025 Population Estimates
Land area418.1 sq mi2025 Gazetteer Files
Water area103.7 sq mi2025 Gazetteer Files
Total area521.8 sq mi2025 Gazetteer Files
Population density?421 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$87,972American Community Survey 2020-2024 5-Year Estimates
Median home value$281,500American Community Survey 2020-2024 5-Year Estimates
Median age40.8American Community Survey 2020-2024 5-Year Estimates
Households68,639American Community Survey 2020-2024 5-Year Estimates
Housing units72,662American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-196
1,562 births, 1,758 deaths
Net migration
+818
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Porter County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
LaPorte CountyIndiana36 mi111,294
Lake CountyIndiana36 mi504,612
Jasper CountyIndiana18 mi33,894
Berrien CountyMichigan14 mi152,444
Cook CountyIllinois0.7 mi5,194,625
Starke CountyIndianaa single point23,425

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 92 counties of Indiana

Open the interactive Indiana county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.