What are the opening hours?

Tuesday 1pm - 4pm Wednesday 1pm - 4pm Thursday 1pm - 4pm Friday 1pm - 4pm Saturday 1pm - 4pm

Hieronymus Mueller Museum

Name: Hieronymus Mueller Museum
Address: 420 W Eldorado Street, Decatur, IL, 62522, US
Telephone: (217) 423-6161
Price range: $

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Hieronymus Mueller Museum

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Contact information, map and directions, contact form, opening hours, services, ratings, photos, videos and announcements from Hieronymus Mueller Museum, History Museum, 420 W Eldorado Street, Decatur, IL.

10/15/2026

In just a few minutes, Mueller Water Products and Hieronymus Mueller Museum are LIVE with the Byers & Co radio show from 6-9am! Tune in at WSOY 1340AM/103.3 FM or streaming at NowDecatur's website!

10/14/2026

Hey, Early Birds!

Tomorrow, we are LIVE with the Byers & Co radio show from 6-9am! Tune in at WSOY 1340AM/103.3 FM or streaming at https://nowdecatur.com/player/?playerID=2324.

(Photo of a perfectly healthy, but possibly grumpy, bird taken by Hieronymus Mueller Museum volunteer at Rock Springs Nature Center.)

10/13/2026

Byers & Co from WSOY/NowDecatur.com will be broadcasting their Thursday radio show from the Hieronymus Mueller Museum!

Tune in Thursday, October 15th from 6-9am to hear segments from Mueller Water Products and Hieronymus Mueller Museum.

Thanks to The Staley Museum for including us in their broadcast with Byers & Co this morning!

10/03/2026

Fall Free Admission Day is coming up on Saturday, October 10th! Join us from 1-4pm for free admission and take part in an exhibit scavenger hunt!

Find the secret item on display and win a Mueller Museum enamel pin! Staff will reveal the secret item as you check into the museum. Available while supplies last.

09/22/2026

Our fall newsletter is here! Our feature article this issue is "Remembering Bill Mueller" written by Bill's daughter, Nancy Mueller. Bill was the grandson of Adolph Mueller, and brother of museum founder Jane Mueller. He passed April 1, 2026 at 93 years old.

You can subscribe to this quarterly newsletter by messaging us your mailing address: your choice of postal or email. We have a few copies of this fall issue left at the museum, so we can still drop one in the mail to you.

09/12/2026

As summer is coming to a close, we're thinking about the old Mueller Employee Picnics that happened during this time of year!

Hieronymus Mueller began the annual Mueller picnic in 1899 to support his Mutual Benefits Association. The MBA was essentially an early insurance program to support sick or injured employees. Later, Mr. Mueller's sons expanded the program as the Employee Aid Society. Employees often received free tickets to the picnic, and the Decatur area was allowed to buy tickets. The event was a massive crowd-pleaser! It was common for 5,000 people to attend each year, with profits from the tickets and food sales funding the MBA and Employee Aid Society.

These photos come from the 1941 Mueller Picnic!

08/29/2026

These images come from Dorothea Toole Babb's scrapbook of Core Room Girls during Okaw trips from 1938-1940. Dorothea worked in Mueller's core room from 1935-1950, and her pictures show a great deal of fun and companionship during these special retreats.

Adolph Mueller purchased the Okaw Cabin in 1921, and he immediately made it available for employees to reserve for their personal use. Often, department groups, like the Core Room Girls here, would spend weekends at the cabin together. The exact modern-day location of the Okaw Cabin is a little hazy, but we currently understand it to be just outside of the Vandalia, Illinois region.

08/08/2026

We are very excited to announce a new donation of items from the South Foundry that are being processed and added to our collection. These are just a few of the gifted items. Do you recognize anything?

Thank you to Mueller Water Products for another wonderful donation!

08/04/2026

Thank you for stopping by and the video, Decatur Area Convention and Visitors Bureau!

Hieronymus Mueller Museum is open Tuesday through Saturday from 1-4pm, except major holidays. Admission is $3/adult and $1/child.
The museum is located near downtown Decatur, at 420 W. Eldorado Street, in Decatur, IL. To get to the museum from downtown Decatur, go north on Route 51 and turn left onto Eldorado Street/U.S. 36. The museum will be on your right. Plenty of free parking is available.

07/22/2026

A picture is worth a thousand words, but sometimes there is more to the story!

This image is of the "new" machine shop built at Mueller in 1915. Before the machinery was moved in, all employees celebrated the project completion on New Year's Eve with a reception and dance. Employees set up the equipment and had it running ten days later!

Address

420 W Eldorado Street
Decatur, IL
62522

Opening Hours

Tuesday	1pm - 4pm
Wednesday	1pm - 4pm
Thursday	1pm - 4pm
Friday	1pm - 4pm
Saturday	1pm - 4pm

Telephone

(217) 423-6161

Website

http://www.muellermuseum.org/

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