Cairo Ohio ZIP Codes

Cairo holds a single ZIP code.

Every ZIP code in Cairo

The complete list of Cairo, Ohio ZIP codes with the county each falls in.
ZIP code	County
45820	Allen County

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Cairo codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Cairo. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

How these codes cluster

Every Cairo ZIP code begins 458. Those first three digits identify the sectional center facility that processes mail for this part of Ohio. Statewide that range covers 85 ZIP codes, so Cairo accounts for 1% of it.

Every Ohio ZIP prefix and the region it covers →

Area codes covering Cairo

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Cairo occupies.

Cairo Ohio area codes in full →

Where Cairo's ZIP codes sit

Each point is one Cairo ZIP code, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Cities near Cairo

The closest places to Cairo with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Beaverdam Ohio ZIP codes	5.8 mi	1 ZIP code
Columbus Grove Ohio ZIP codes	6.3 mi	1 ZIP code
Lima Ohio ZIP codes	6.4 mi	6 ZIP codes
Pandora Ohio ZIP codes	10 mi	1 ZIP code
Bluffton Ohio ZIP codes	11 mi	1 ZIP code
Harrod Ohio ZIP codes	12 mi	1 ZIP code
Kalida Ohio ZIP codes	12 mi	1 ZIP code
Fort Jennings Ohio ZIP codes	12 mi	1 ZIP code

Straight-line distance between place reference points, not driving distance.