ZIP code · Red Oak · Iowa · United States

ZIP code 51566 — Red Oak

ZIP code 51566 serves Red Oak, Iowa.

Postal code
51566
Single source Value from one source, not cross-checked.
City
Red Oak
County
Montgomery FIPS 19137
State
Iowa
Country
United States
Coordinates
41.0079, -95.2269 — precision precise (locality)
View on OpenStreetMap
Population
7,004 (ZCTA, ACS 5-year)
Population density
40 / sq mi
Land area
176.4 sq mi (456.9 km²) (ZCTA, ACS 5-year)
Median household income
$58,264
Per-capita income
$37,864
Median age
42.6
Households
3,159
Housing units
3,435
Median home value
$116,200
Median gross rent
$783 / month
Congressional districts
IA-3 (also IA-4) (119th Congress)
USDA hardiness zone
5b (-15 to -10 °F)
Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
Time zone
America/Chicago (UTC−6 / UTC−5 DST)
Area code
712
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 86°F), coldest Jan (avg low 13°F).

JanFebMarAprMayJunJulAugSepOctNovDec
Avg high °F333851637383868578665037
Avg low °F131628385161666353412818
Precip in0.91.12.03.86.05.44.03.93.63.31.91.4

NOAA 1991–2020 climate normals from the nearest station: RED OAK (0.8 mi) · NOAA NCEI

Places in ZIP 51566

Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology

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