Porter County is a county in the U.S. state of Indiana. As of 2020, the population was 173,215, making it the 10th most populous county in Indiana. The county seat is Valparaiso. The county is part of Northwest Indiana, as well as the Chicago metropolitan area. Porter County is the site of much of the Indiana Dunes, an area of ecological significance. The Hour Glass Museum in Ogden Dunes documents the region's ecological significance.

Region: Northwest Indiana
Metro area: Chicago Metropolitan
Established: 1837
Named for: David Porter
County seat: Valparaiso
Largest city: Portage (population and area)
Type: County
Area rank: 29th largest county in Indiana
Population (2020): 173,215
Estimate (2025): 176,049
Rank: 9th largest county in Indiana, 374th largest county in U.S.
Metro: 9,522,434
Region: 819,537
Time zone: Central (UTC−6)
Summer (DST): Central (UTC−5)
ZIP Codes: 46301-02, 46304, 46307-08, 46341-42, 46347, 46360, 46368, 46383-85, 46391, 46393
Area code: 219
Congressional district: 1st
Indiana Senate districts: 4th, 5th and 6th
Indiana House of Representatives districts: 3rd, 4th, 10th, 19th and 20th
FIPS code: 18-127
GNIS feature ID: 0450382
Interstates: -
U.S. Routes: -
State Routes: -
Airport: Porter County Regional
Waterways: East Arm Little Calumet River, Kankakee River, Lake Michigan, Little Calumet River, Port of Indiana-Burns Harbor, Salt Creek
South Shore Line stations: Beverly Shores – Dune Park Portage/Ogden Dunes
Public transit: V-Line
Website: www.portercountyin.gov
Official Website: http://www.porterco.org
Wikidata description: county in Indiana, United States
Wikidata id: Q506752
Wikidata label: Porter County
Wikidata aliases: Array
Source
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