How to Look Up an LLC in South Dakota (2026)

Published by Jon Morgan | Co-Founder & Chief Editor

Last updated: August 22, 2026

FACT CHECKED by Jon Tobin, Business Attorney

Methodology
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The fastest way to look up an LLC in South Dakota is the Secretary of State's Business Information Search. It's an online database that covers each entity registered with the state, active or dissolved. Search by business name, by the state's own ID number or by registered agent.

Business owners use it to check whether a name is already taken before filing. A buyer or lender comparing companies can pull the same record to confirm one is still active and in good standing.

This guide covers every official way to search, plus a trademark check and what a "Delinquent" search result means for the business.

Quick Summary

How to Search for an LLC in South Dakota

The Business Information Search is the state's main tool for finding an LLC, no matter its current status. Use it to confirm a competitor or vendor is on file too.

Here's how to run a search:

1. Open the Business Information Search tool.
2. Type the name into the Search Name field, picking Starts With or Contains, or search by Business ID instead.
3. Check the Active Entities Only box to see only companies in good standing.
4. Click Search, then open a result to see its formation date, registered agent and current status.

Two more official tools help when this one comes up empty. One checks name availability, and the other looks up a registered agent.

1. Check If a Name Is Available Before You File

Run a proposed name through the Business Name Availability Search instead of the general tool above. It only returns an exact match. That makes it good for one job: telling you whether your exact proposed name is already taken.

South Dakota law requires an LLC's name to look different from every other name already on file. That rule covers any name already registered or reserved with the state [1]. A clear result is a good sign. The state still reviews the name again at filing, so a clean search is not a final guarantee.

Reserve the Name

You might be planning to start an LLC in South Dakota but not be ready to file yet. Reserve the name first. That holds it for 120 days. File an Application for Reservation of Name and pay a $25 fee [2].

2. Search by Registered Agent or Contact the Office

The Search by Registered Agent tool works differently. It looks up businesses by their agent's name or agent number instead of the company name. That's useful when you know who represents a business but not what it's called.

If neither online tool turns up an answer, call the Business Services line directly at (605) 773-4845. You can also email corpinfo@state.sd.us with your question.

None of these unofficial channels replace South Dakota's own entity search tools above. See our guide to looking up an LLC in any state for the same process elsewhere. A quick look at LinkedIn or a local chamber of commerce site can still add useful context.

How to Check if a Business Name Is Trademarked in South Dakota

A clean result on the entity search doesn't mean the name is free to use everywhere. South Dakota recognizes both state and federal trademarks.

1. Search the Federal Database

Open the USPTO's Trademark Search tool, which covers marks registered nationwide. Enter the name or phrase you're considering. Treat any close match in a related industry as a warning sign.

2. Search South Dakota's State Trademark Registry

A mark can be registered at the state level. It never has to show up in the USPTO's own database. Use the Trademark Search on the Secretary of State's website. Search by name or by trademark ID, then check the Active Trademarks Only box to skip expired registrations.

A state trademark protects the name only inside South Dakota. A federal mark protects it nationwide, which matters more if the business plans to operate outside the state.

Reasons to Perform a Search

Running a business search isn't just a formality. It answers real questions before you sign a contract or file paperwork.

Here are the main reasons people use it:

1. Checking whether a name is already in use before you file.
2. Confirming a company is actually registered in South Dakota instead of just claiming to be.
3. Reviewing a potential partner before you sign anything.
4. Finding out whether an LLC is active or dissolved.
5. Reviewing an LLC's current filing details before doing business with it.

Annual Reports and Certificates of Good Standing in South Dakota

A result showing "Delinquent" usually means the LLC missed its Annual Report, required every year. The Business Information Search itself shows when the next one is due, and filing costs $55 online or $70 by paper.

An LLC that stays delinquent long enough gets dissolved by the state. Getting it back active means filing a reinstatement, on top of the missed reports themselves. Our guide to how to dissolve an LLC in South Dakota covers what that status means.

A missed deadline can happen to anyone running a busy company. Comparing South Dakota registered agent services can help keep the next one on track.

For a brand new LLC, our review of South Dakota LLC filing services can help. It covers who can handle the paperwork once your name search comes back clear. A lender asking for proof an LLC is active usually wants a Certificate of Good Standing. That costs $20 online or $35 by paper.

FAQs

References:

1. https://law.justia.com/codes/south-dakota/title-47/chapter-34a/section-47-34a-105/
2. https://law.justia.com/codes/south-dakota/title-47/chapter-34a/section-47-34a-106/