We will be CLOSED Monday, May 29, 2023.

Any transactions after closing Friday, May 26, 2023 will post to your account on Tuesday, May 30, 2023 due to the observance of MEMORIAL DAY.  

*This affects all wires & ACH transactions.

May 23rd – May 25th our Johnston Drive-up will be temporarily closed for construction.

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What’s going on in banking?

  • Our President Austin Jones discusses his take on the current state of the banking industry.







Do we have your current phone number?

Make sure to update your contact info with us. We are updating our online banking security to ensure your information remains protected. Learn more about Secure Now by clicking below.


External transfers now available in online & mobile banking

  • Log in to your online banking to get started today!

Business banking made easier with our mobile app!

  •  Check Balances
  •  Review Transactions
  •  Make Transfers
  •  Send Payments
  •  Deposit Checks
  •  Fraud Protection


The credit card from the bank you know best.

  • Personal Service with Worldwide reach
  • Better reward points
  • Competitive Rates with Hometown Service
  • More Security

Take control of your debit card with GSB card control

  • Quickly detect unauthorized activity on your debit card
  • Turn your debit card off and on
  • See your account balance
  • Find nearby ATMs
  • Submit travel notices

Grinnell State Bank Locations

814 4th Ave
Grinnell, IA 50112
(641) 236-3174

5601 Merle Hay Rd
Johnston, IA 50131
(515) 278-6300

1101 Court Ave
Marengo, IA 52301
(319) 642-5511 | Bank
(319) 642-5514 | Insurance

205 E Broadway St
Polk City, IA 50226
(515) 984-6211


Convenient Online & Mobile Banking

Check out all of our options that make banking fit into your life.


Get Started! Open your accounts in just 15 minutes.

Not sure what you need? Check out Simply Banking and open your accounts online or in person at any of our four locations.

Simply Switch

The best accounts bundled to make your banking experience simple.

Combine the smarter way to save with the convenience of the no minimum average balance checking with our  Simply Savings and Simply Checking accounts.


Grow Your Savings

With Simply Savings, simply deposit your money and save higher than the FDIC national average savings rate on up to $25,000. Enjoy high-yield savings without the term limits.

No Minimum Average Balance

With Simply Checking, dipping below your average account balance doesn’t result in enormous fees. With monthly service fees as low as $0.50 per month, you can enjoy your money your way.

Upgrade To Save On Fees

With Preferred Checking, you can wave (waive) monthly service fees goodbye by maintaining the Average Available (collected) Balance! Learn more about how to enjoy your money and make your accounts work for you with preferred checking*Inactivity fees may still apply.

Simply Smarter Business

Simply Savings for business…don’t take it “personal”!

A savvy, high-yield business savings account that offers your business the ability to start earning a higher interest rate, higher than the FDIC national average savings rate, on your excess funds with an interest rate tiered based on your account balance. Learn more about our high yield business savings account.


Here to be your partner on your financial journey.

Whether you’re looking to invest, needing advice about how to save, or wanting a comprehensive look at your finances, we have the services & products backed by a team of advisors with over 78 years of combined experience, we will work with you to meet your financial goals.

  • 24/7 Access to the Investment Platform
  • Knowledgeable advisors, each with many years of experience
  • A Financial Planning Tool you can use anywhere
  • Performance Reviews at Request

Give us a call at 641.260.2GWM or click below to learn more.

Investment products are not FDIC insured, are not bank guaranteed, and may lose value.


Real Humans Answer Your Calls

Imagine big bank products and services without those irritating automated phone prompts. Grinnell State Bank is proud to offer customer service with the small-town touch. Talk to you soon!


Bringing the Bank to you

We want to make banking easy for you with 24/7 access to your accounts and convenient access to services. Have 24/7 access to all of the following without having to step foot in the bank:

For a printable version of Reg E:

 You are accessing a printable version of our Electronic Funds Transfer.

For a printable version of our Online Terms and Conditions:


You are accessing a printable version of Grinnell State Bank’s Online Banking Terms and Conditions. There are hyperlinks appearing within the document to access additional bank policy information referenced by the link. The links are for reference only, please contact the bank directly to request a copy of the referenced information.