Red Oak, IA ZIP codes

Red Oak, Iowa has 2 ZIP codes, including 1 PO Box ZIP. They are in Montgomery County.

Population in these ZIPs: 7,010
Avg. median income: $56,600population-weighted
Typical home value: $135,000population-weighted

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Red Oak, IA ZIP codes list

Red Oak, IA ZIP codes
ZIP code	County	Population	Median income	Typical home value
51566	Montgomery County	7,010	$56,637	$135,000
51591 PO Box	Montgomery County	—	—	—

Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology

Cities near Red Oak

Stanton 6 mi
Elliott 9 mi
Emerson 10 mi
Villisca 12 mi
Essex 13 mi
Grant 14 mi
Henderson 14 mi
Griswold 14 mi
Imogene 15 mi
Hastings 16 mi
Nodaway 17 mi
Macedonia 18 mi

Frequently asked questions

What is the ZIP code for Red Oak, IA?

Red Oak, IA has 2 ZIP codes: 51566 and 51591.

What county is Red Oak, Iowa in?

Red Oak ZIP codes are in Montgomery County.

Which Red Oak ZIP codes are PO Boxes?

51591 is a PO Box or single-organization ZIP code; it has no residential delivery area.