Olmsted County ZIP Codes

Olmsted County is a county of Minnesota.

ZIP codes: 11
Cities & towns: 6
Area codes: 2
Land area: 654 sq mi

Every ZIP code in Olmsted County

559xx

The complete list of Olmsted County, MN ZIP codes with the city each one delivers to.
ZIP code	City
55901	Rochester
55902	Rochester
55903	Rochester
55904	Rochester
55905	Rochester
55906	Rochester
55920	Byron
55929	Dover
55934	Eyota
55960	Oronoco
55976	Stewartville

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Olmsted County codes above are listed without a column we would have to invent.

Cities and towns in Olmsted County

Area codes covering Olmsted County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

Where Olmsted County's ZIP codes sit

Each point is the reference point of one Olmsted County ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

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

Scope every ZIP code recorded in Olmsted County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.