Ithaca, OH ZIP Code

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

The ZIP code of Ithaca, OH is 45304. It is in Darke County.

Mailing address format for Ithaca

John Smith
123 Main St
ITHACA OH 45304
USA

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

ZIP code	Population	Area
45304	—	85.2 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 Ithaca, OH?

The main ZIP code for Ithaca, OH is 45304.

How many ZIP codes does Ithaca have?

Ithaca has 1 ZIP code.

What county is Ithaca, OH in?

Ithaca is in Darke County, Ohio.

What time zone is Ithaca in?

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

What are the coordinates of Ithaca?

Latitude 39.93767, longitude -84.55321.

Last updated: November 14, 2026