ZIP code · Petroleum · Indiana · United States

ZIP code 46778 — Petroleum

ZIP code 46778 serves Petroleum, Indiana.

Postal code
46778
Single source Value from one source, not cross-checked.
City
Petroleum
County
Wells FIPS 18179
State
Indiana
Country
United States
Coordinates
40.6114, -85.1526 — precision precise (locality)
View on OpenStreetMap
Population
83 (ZCTA, ACS 5-year)
Population density
32 / sq mi
Land area
2.6 sq mi (6.7 km²) (ZCTA, ACS 5-year)
Per-capita income
$27,331
Median age
53.2
Households
46
Housing units
46
Median home value
$74,600
Congressional district
IN-3 (119th Congress)
USDA hardiness zone
6a (-10 to -5 °F)
Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
Time zone
America/Indiana/Indianapolis (UTC−5 / UTC−4 DST)
Area code
260
Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.

Climate — monthly normals

Warmest month Jul (avg high 84°F), coldest Jan (avg low 18°F).

JanFebMarAprMayJunJulAugSepOctNovDec
Avg high °F333647617281848276645038
Avg low °F182028395161646254433324
Precip in2.92.43.04.04.64.64.63.93.23.03.12.7

NOAA 1991–2020 climate normals from the nearest station: BERNE WWTP (12.3 mi) · NOAA NCEI

About this page

US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.

GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page