Humboldt County Jail Inmate Mail

Last updated by Elizabeth Boyle

Search for an Inmate or Active Arrest Warrant in Humboldt County

Send an Inmate Mail in the Humboldt County Jail

A paper letter is the way to reach someone held at the Humboldt County Jail, which is in the sheriff's building on Sumner Avenue in the town of Humboldt. The county offers no electronic messaging, so everything goes through the post office to this one jail address.

Letters and legal mail:
Humboldt County Jail
430 Sumner Ave.
Humboldt, IA 50548

  • The inmate's name: Write their full legal name, not a nickname, above the address.
  • Your name and address: Put your own return address on every envelope so the jail knows who sent it.
  • Check first: Look the person up on the inmate search before you mail anything, since people can be released or moved.

Type of Mail Allowed for Humboldt County Jail

Humboldt County publishes no mail rules, so check with 515-332-2471 before enclosing anything besides a letter.

Humboldt County Mail Questions

Should I send letters to the Dakota City courthouse?

Will the Humboldt County Jail deliver family photos to him?

Should I send letters to the Dakota City courthouse?

No, to the Sumner Avenue jail in Humboldt.

Will the Humboldt County Jail deliver family photos to him?

Ask 515-332-2471 first.

Emailing an Inmate in the Humboldt County Jail

Humboldt County shows no electronic messaging on its site; write a letter.

Search for an Inmate or Active Arrest Warrant in Humboldt County

Human-verified information Manually curated

Every detail on this page is checked by hand, not scraped. This unofficial directory helps friends and family of incarcerated individuals find critical information — inmate lists, locations, bail resources, visitation hours, rules, and text, phone, email, and mail services — for jails, detention centers, and prisons across the United States.