ZIP codes

ZIP codes in Olmsted County, Minnesota

Olmsted County has 20 ZIP codes. 9 lie entirely inside it and 11 are shared with neighboring counties, so part of their land and their people are elsewhere. About 167,261 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 20; 1 more just touches the border (under 1% of their land)
Entirely inside: 9; 99% or more of their land
Shared with other counties: 11; Most with Dodge County (4)
Most populated ZIP: 55901; 58,495 people · Rochester
Least populated ZIP: 55929; 1,383 people · Dover; 2 more with nobody living there
Largest ZIP by land: 55976; 91 sq mi · Stewartville

Map of the ZIP codes in Olmsted County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Olmsted County

20 ZIP codes in Olmsted County, MN, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
55901	Rochester	58,495	100%	58,495
55902	Rochester	26,464	100%	26,464
55903	Rochester	0	100%	0
55904	Rochester	29,639	100%	29,639
55905	Rochester	0	100%	0
55906	Rochester	20,437	92%	≈ 20,308
55920	Byron	9,271	100%	9,271
55923	Chatfield	4,375	46%	≈ 1,919
55929	Dover	1,383	100%	1,383
55932	Elgin	1,999	52%	≈ 1,389
55934	Eyota	3,466	100%	3,466
55940	Hayfield	2,791	8.6%	≈ 233
55944	Kasson	8,161	6.3%	≈ 92
55955	Mantorville	2,605	3.1%	≈ 112
55956	Mazeppa	2,199	2.3%	≈ 79
55960	Oronoco	3,375	99.9%	≈ 3,375
55963	Pine Island	5,244	34%	≈ 1,843
55964	Plainview	4,400	11%	≈ 228
55972	St. Charles	5,434	26%	≈ 820
55976	Stewartville	8,509	83%	≈ 8,113

They also touch the county with under 1% of their land, so they aren’t counted: 55991.

ZIP codes shared with other counties

These 11 ZIP codes have part of their land in another county. The first figure is the share of their land in Olmsted County; then, where the rest lies.

55906 (Rochester): 92% here; 8.0% in Wabasha County.
55923 (Chatfield): 46% here; 50% in Fillmore County and 3.3% in Winona County.
55932 (Elgin): 52% here; 48% in Wabasha County.
55940 (Hayfield): 8.6% here; 90% in Dodge County and 1.3% in Mower County.
55944 (Kasson): 6.3% here; 94% in Dodge County.
55955 (Mantorville): 3.1% here; 97% in Dodge County.
55956 (Mazeppa): 2.3% here; 71% in Wabasha County and 26% in Goodhue County.
55963 (Pine Island): 34% here; 46% in Goodhue County and 20% in Dodge County.
55964 (Plainview): 11% here; 79% in Wabasha County and 10% in Winona County.
55972 (St. Charles): 26% here; 74% in Winona County.
55976 (Stewartville): 83% here; 15% in Fillmore County and 1.5% in Mower County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Rochester (6), Byron (1), Chatfield (1), Dover (1), Elgin (1), and Eyota (1); 15 places in all.

All 20 start with the same three digits, 559: the prefix of the USPS sorting center that handles them.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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