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.


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

Branch 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


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.