| ZIP Codes: | 11 ZIP Codes (9 Standard, 1 PO Box, 1 Unique) [See All] |
| Area Codes: | 507 / 924 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:38 PM |
| Population: | 161,039 [See All] |
| FIPS: | 27109 |
| CBSA: | Rochester, MN |
| Land Area: | 518 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 44.0184, -92.4426 |
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161,039 residents live across 11 ZIPs covering 518 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 143,015 to 161,039 from 2014 to 2024 — a +12.6% change. 9 ZIPs gained residents, 0 lost (and 1 held flat).
The county's wealthiest ZIP 55920 (Byron, $131,336 median) and poorest ZIP 55904 (Rochester, $77,016) are 11.9 miles apart — a 1.7× income gap across local geography.
Median home values vary 1.9× across this county — from $253,600 in 55904 (Rochester) to $481,200 in 55960 (Oronoco).
Density varies 53× across the county — from 33 people/sq mi in 55929 (Dover) to 1,742 in 55901 (Rochester).
Educational attainment ranges from 31.3% bachelor's+ in 55929 (Dover) to 65.5% in 55902 (Rochester) — the breadth of educational profiles across the area.
Within Minnesota, this is the #7 most populous of 93 counties and ranks #7 for median household income with the #6 fastest decade growth .
Hosts 1 single-entity Unique ZIP: 55905Mayo Clinic .
Weighted by population, the typical household earns about $98,004 across the county — reflecting what a typical resident sees, not a simple ZIP average.
49.7% of adults age 25+ hold a bachelor's degree or higher (54,322 of 109,352 reporting). The most-educated ZIPs cluster around Rochester.
9 Standard delivery, 1 PO Box only, 1 single-entity Unique ZIPs serve this county.
1 ZIP in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 55901 | Rochester | Standard | 58,495 | $94,607 | 33.6 | 9.9% |
| 55904 | Rochester | Standard | 29,639 | $77,016 | 62.0 | 12.9% |
| 55902 | Rochester | Standard | 26,464 | $120,611 | 42.2 | 16.1% |
| 55906 | Rochester | Standard | 20,437 | $93,685 | 61.3 | 11.4% |
| 55920 | Byron | Standard | 9,271 | $131,336 | 67.5 | 29.0% |
| 55976 | Stewartville | Standard | 8,509 | $87,330 | 89.2 | 11.9% |
| 55934 | Eyota | Standard | 3,466 | $84,952 | 82.6 | 3.2% |
| 55960 | Oronoco | Standard | 3,375 | $130,227 | 37.4 | 11.9% |
| 55929 | Dover | Standard | 1,383 | $118,977 | 42.2 | 13.8% |
| 55905 | Rochester | Unique | 0 | — | 0.0 | — |
| 55903 | Rochester | PO Box | 0 | — | 0.0 | — |