Old Monroe Missouri ZIP Codes

Old Monroe holds a single ZIP code.

Every ZIP code in Old Monroe

The complete list of Old Monroe, Missouri ZIP codes with the county each falls in.
ZIP code	County
63369	Lincoln 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Old Monroe codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Old Monroe. 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 Old Monroe ZIP code begins 633. Those first three digits identify the sectional center facility that processes mail for this part of Missouri. Statewide that range covers 51 ZIP codes, so Old Monroe accounts for 2% of it.

Every Missouri ZIP prefix and the region it covers →

Area codes covering Old Monroe

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 Old Monroe occupies.

636 Area code 636

Old Monroe Missouri area codes in full →

Where Old Monroe's ZIP codes sit

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

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

Cities near Old Monroe

The closest places to Old Monroe with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Winfield Missouri ZIP codes	4.0 mi	1 ZIP code
Foley Missouri ZIP codes	7.7 mi	1 ZIP code
Moscow Mills Missouri ZIP codes	9.5 mi	1 ZIP code
O Fallon Missouri ZIP codes	10 mi	2 ZIP codes
Wentzville Missouri ZIP codes	10 mi	1 ZIP code
Troy Missouri ZIP codes	12 mi	1 ZIP code
Cottleville Missouri ZIP codes	14 mi	1 ZIP code
Foristell Missouri ZIP codes	14 mi	1 ZIP code

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.