Humboldt County ZIP Codes
Iowa, United States · 11 codes
Humboldt County in Iowa has 11 ZIP codes, from 50519 to 50591, serving 11 places.
ZIP codes in Humboldt
Frequently asked questions
What is the ZIP code of Humboldt?
Humboldt has 11 ZIP codes, from 50519 to 50591. The table lists the places each one serves.
How many places are listed in Humboldt County?
11 places.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.