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Callao Missouri ZIP Codes

Callao holds a single ZIP code.

Every ZIP code in Callao

The complete list of Callao, Missouri ZIP codes with the county each falls in.
ZIP codeCounty
63534Macon 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Callao codes above are listed without a column we would have to invent.

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

How these codes cluster

Every Callao ZIP code begins 635. Those first three digits identify the sectional center facility that processes mail for this part of Missouri. Statewide that range covers 33 ZIP codes, so Callao accounts for 3% of it.

Every Missouri ZIP prefix and the region it covers →

Area codes covering Callao

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

Callao Missouri area codes in full →

Where Callao's ZIP codes sit

Each point is one Callao ZIP code, plotted from its record coordinates.
  • Reference points and footprint
  • Not an official NANPA boundary
  • Not a USPS delivery area

Cities near Callao

The closest places to Callao with their own ZIP code list, nearest first.
CityDistanceZIP codes
Bevier Missouri ZIP codes3.2 mi1 ZIP code
New Cambria Missouri ZIP codes6.9 mi1 ZIP code
Macon Missouri ZIP codes8.2 mi1 ZIP code
Ethel Missouri ZIP codes11 mi1 ZIP code
Atlanta Missouri ZIP codes12 mi1 ZIP code
Elmer Missouri ZIP codes14 mi1 ZIP code
Bucklin Missouri ZIP codes14 mi1 ZIP code
Jacksonville Missouri ZIP codes15 mi1 ZIP code

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