Cairo, OH ZIP Code

ZIP code, county, time zone and coordinates of Cairo, Ohio

The ZIP code of Cairo, OH is 45820. It is in Allen County.

Mailing address format for Cairo

John Smith
123 Main St
CAIRO OH 45820
USA

USPS prefers capital letters without punctuation. Check the exact ZIP+4 for a street address on the USPS website.

ZIP code	Population	Area
45820	—	0.3 sq mi	Main

ZIP Code Tabulation Areas (ZCTA), U.S. Census Bureau. A ZCTA can cover parts of more than one town.

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What is the ZIP code for Cairo, OH?

The main ZIP code for Cairo, OH is 45820.

How many ZIP codes does Cairo have?

Cairo has 1 ZIP code.

What county is Cairo, OH in?

Cairo is in Allen County, Ohio.

What time zone is Cairo in?

Cairo is in the America/New York time zone (EST, UTC-05:00 right now).

What are the coordinates of Cairo?

Latitude 40.83075, longitude -84.08449.

Last updated: November 14, 2026