We will be CLOSED Friday, July 4, 2025 in observance of Independence Day.

Any transactions after closing Thursday, July 3, 2025 will post to your account on Monday, July 7, 2025.

*This affects all wires & ACH transactions.

Our Marengo Branch will close at 4pm on Thursday, July 3rd for the Marengo 3rd of July Parade.

IMPORTANT MESSAGE TO COMBAT SCAMS: Grinnell State Bank will never contact you and request your One-Time-Passcode for your online/mobile banking. If someone is claiming to be Grinnell State Bank and has requested this information, please hang up or ignore the text and call your local branch.

Instagram
Telebanking (800) 411-9331
Online Login Portal
Open Account Now

Rates

Online Login Portal
Open Account Now

Grinnell State Bank Branch Locations & Hours

LOCATED DOWNTOWN IN THE HEART OF THE GRINNELL COMMUNITY

Grinnell Branch

ADDRESS

814 4th Avenue
PO Box 744
Grinnell, IA 50112

HOURS

Monday – Thursday 8:30am – 4:30pm
Friday 8:30am – 5:00pm
Saturday Closed*

DRIVE-UP HOURS

Monday – Friday 8:00am – 5:00pm
Saturday Closed*

DRIVE-UP ATM

24 Hour ATM located in the alley.

HOLIDAY HOURS

PHONE

Grinnell (641) 236-3174
Toll Free (800) 236-3187
Fax (641) 236-4329
Lost/Stolen Debit Cards (800) 383-8000

Grinnell Wealth Management (641) 260-2GWM (2496)

*Customer Service Support is available by phone on Saturday mornings from 9:00am – 12:00pm via the Toll Free Number.

Contact Us
Review Us On Google
LOCATED IN THE DOWNTOWN SQUARE OF MARENGO

Marengo Branch

ADDRESS

1101 Court Avenue
PO Box 168
Marengo, IA 52301

HOURS

Monday – Thursday 8:30am – 4:00pm
Friday 8:30am – 5:00pm
Saturday Closed*

DRIVE-UP HOURS

Monday – Friday 8:00am – 5:00pm
Saturday Closed*

INDOOR ATM

24 Hour ATM located in the bank entryway.

HOLIDAY HOURS

PHONE

Marengo (319) 642-5511
Fax (319) 642-1111
Toll Free (800) 236-3187
Insurance (319) 642-5514
Lost/Stolen Debit Cards (800) 383-8000

*Customer Service Support is available by phone on Saturday mornings from 9:00am – 12:00pm via the Toll Free Number.

Contact Us
Review Us On Google
LOCATED NORTH OF INTERSTATE 80 ON MERLE HAY ROAD

Johnston Branch

ADDRESS

5601 Merle Hay Road
PO Box 200
Johnston, IA 50131

HOURS

Monday – Friday 9:00am – 4:30pm
Saturday Closed*

DRIVE-UP HOURS

Monday – Friday 8:30am – 5:00pm
Saturday Closed*

DRIVE-UP ATM

24 Hour ATM located in the drive-up.

HOLIDAY HOURS

PHONE

Johnston (515) 278-6300
Toll Free (800) 236-3187
Fax (515) 278-6370
Lost/Stolen Debit Cards (800) 383-8000

*Customer Service Support is available by phone on Saturday mornings from 9:00am – 12:00pm via the Toll Free Number.

Contact Us
Review Us On Google
LOCATED IN THE HEART OF POLK CITY

Polk City Branch

ADDRESS

205 Broadway Street
PO Box 79
Polk City, IA 50226

HOURS

Monday – Friday 9:00am – 4:30pm
Saturday Closed*

DRIVE-UP HOURS

Monday – Friday 8:30am – 5:00pm
Saturday Closed*

DRIVE-UP ATM

24 Hour ATM located at the drive-up entrance.

HOLIDAY HOURS

PHONE

Polk City (515) 984-6211
Toll Free (800) 236-3187
Fax (515) 984-6986
Lost/Stolen Debit Cards (800) 383-8000

*Customer Service Support is available by phone on Saturday mornings from 9:00am – 12:00pm via the Toll Free Number.

Contact Us
Review Us On Google

2025 Holiday Schedule

Martin Luther King Jr Day

Monday | January 20, 2025

CLOSED

Any transactions after closing Friday, January 17 will post
to your account on Tuesday, January 21.

Presidents Day

Monday | February 17, 2025

CLOSED 

Any transactions after closing Friday, February 14 will post
to your account on Tuesday, February 18.

Memorial Day

Monday | May 26, 2025

CLOSED

Any transactions after closing Friday, May 23 will post
to your account on Tuesday, May 27.

Juneteenth

Thursday | June 19, 2025

Open Normal Hours | Non-Processing

Any transactions after closing Wednesday, June 18 will post
to your account on Friday, June 20.

Independence Day

Friday | July 4, 2025

CLOSED 

Any transactions after closing Thursday, July 3 will post
to your account on Monday, July 7.

Labor Day

Monday | September 1, 2025

CLOSED

Any transactions after closing Friday, August 29 will post
to your account on Tuesday, September 2.

Columbus Day

Monday | October 13, 2025

CLOSED

Any transactions after closing Friday, October 10 will post
to your account on Tuesday, October 14.

Veterans Day

Tuesday | November 11, 2025

CLOSED

Any transactions after closing Monday, November 10 will post
to your account on Wednesday, November 12.

Thanksgiving

Thursday | November 27, 2025

CLOSED

Any transactions after closing Wednesday, November 26 will

post to your account on Friday, November 28.

Black Friday

Friday | November 28, 2025

Open until 12PM

Any transactions after closing Friday, November 28 will post
to your account on Monday, December 1.

Christmas Eve

Wednesday | December 24, 2025

Open until 12PM

Any transactions after closing Wednesday, December 24 will post
to your account on Friday, December 26.

Christmas Day

Thursday | December 25, 2025

CLOSED

Any transactions after closing Wednesday, December 24 will post
to your account on Friday, December 26.

New Years Eve

Wednesday | December 31, 2025

Lobby open until 12PM | Drive-Up open until 3PM

Any transactions after closing Wednesday, December 31 will post
to your account on Friday, January 2.

New Years Day

Thursday | January 1, 2026

CLOSED

Any transactions after closing Wednesday, December 31 will post
to your account on Friday, January 2, 2026.

Our Locations

Instagram

24/7 Telebanking

Balances, Transfers, and Account Information

800-411-9331

PIN #: Unique number set at account opening.

Routing Number

073901725

DOWNLOAD OUR APP
download app from appstore
Grinnell State Bank
©2025- Grinnell State Bank

Privacy Policy | Online Terms and Conditions | Website Design by Running Robots

Live Chat

You are now leaving Grinnell State Bank

Grinnell State Bank provides links to web sites of other organizations in order to provide visitors with certain information. A link does not constitute an endorsement of content, viewpoint, policies, products or services of that web site. Once you link to another web site not maintained by Grinnell State Bank, you are subject to the terms and conditions of that web site, including but not limited to its privacy policy.

You will be redirected to append link
Click the link above to continue or CANCEL
BENEFITS OF YOUR ACCOUNT

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:

Your Current Accounts

Mobile App with Mobile Deposit, Bill Pay, Internal Account Transfers & more

Fee-Free Shazam Privileged Status ATMs

Telebanking

For a printable version of Reg E:

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

Okay, Proceed to View or Print

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.

Okay, Proceed to Print