Hieronymus Mueller Museum

Hieronymus Mueller Museum 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.

These images come from Dorothea Toole Babb's scrapbook of Core Room Girls during Okaw trips from 1938-1940. Dorothea wor...
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.

We are very excited to announce a new donation of items from the South Foundry that are being processed and added to our...
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.

A picture is worth a thousand words, but sometimes there is more to the story!This image is of the "new" machine shop bu...
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!

Happy Birthday, Hieronymus Mueller! To celebrate, we will have free admission to the museum today (Thursday, July 16th)!...
07/16/2026

Happy Birthday, Hieronymus Mueller! To celebrate, we will have free admission to the museum today (Thursday, July 16th)!

In 1832, Mr. Mueller was born in Wertheim, located in modern-day southwestern Germany, and he left behind a legacy that lives on through his descendants and the company he founded. Read more about Mr. Mueller here: https://www.muellermuseum.org/mueller-bio/

Hieronymus Mueller Museum will be closed on Saturday, July 4th, in honor of Independence Day. The following Saturday, on...
07/01/2026

Hieronymus Mueller Museum will be closed on Saturday, July 4th, in honor of Independence Day. The following Saturday, on July 11th, we will host our Second Saturday Public Guided Tour.

Have a safe and happy Fourth of July, and we hope to see you soon!

06/18/2026

Hieronymus Mueller Museum is closed today and tomorrow for staff meetings and Juneteenth. We will reopen on Saturday, June 20th.

When we write descriptions for historical images, sometimes we are lucky and the names and event are written on the back...
06/06/2026

When we write descriptions for historical images, sometimes we are lucky and the names and event are written on the back. Often, they are blank, and we have to search for the information. This can look like a matching game, comparing photos with images used for articles in the Mueller Record.

Recently, we tried to identify a photo and, much to our amusement, we discovered a niche genre of photo found in the Mueller Record: "three men look at fire hydrants." (We had to limit ourselves to just 10 examples.)

The photo was eventually found with the identifying information in the Mueller Record. If this kind of matching game sounds fun to you, message us about volunteer opportunities!

We had a great time at this year's Annual Mueller Retiree and Volunteer Luncheon! Thank you to Mueller Water Products fo...
05/29/2026

We had a great time at this year's Annual Mueller Retiree and Volunteer Luncheon! Thank you to Mueller Water Products for co-sponsoring the event along with the Hieronymus Mueller Family Foundation!

Presentations were given by Riley Kerestes, Mueller Water Products Decatur Plant Manager, and Katherine, Museum Director. MWP held a raffle for prizes, as well.

If you are a Mueller Co. retiree and did not receive a paper invitation to the luncheon, contact the museum to join the mailing list at [email protected].

05/28/2026

Hieronymus Mueller Museum is closed today, Thursday, May 28th to host the Annual Retiree and Volunteer Luncheon. Normal hours resume 1-4pm on Friday.

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

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