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Visit your local Post Office™ at 401 William St to find everything you need to send mail and ship packages. Explore our other products and services like money orders, Post Office™ boxes, passports, gift cards, and more
Went on Saturday 10 min before closing and the doors were locked . Only one customer in line. This is reliably the most surly PO employee Ever seen countered. I should have gone to Oak Park.
EE
Eugene
Dec 17, 2025
5.0
I recently experienced an issue with some of my mail and contacted my local Post Office. Since then, I’ve been contacted by multiple team members who have been incredibly helpful and genuinely committed to finding a solution. Everyone I spoke with was friendly, professional, and extremely supportive. This level of service has always been my experience when visiting this Post Office. It’s truly nice to know there is such a dedicated and caring group of people working there.
KV
K Vidavitchy
May 7, 2021
1.0
This location perpetually closes for lunch from 1-2:15PM. Their online hours never reflect this.
CA
Cheryl Anderson
Apr 7, 2018
5.0
I Love the Great Service, and Respect. I don’t understand why staff had to remove their pictures of pets from their station. Supervisor is not in touch with customers, very regiment!😟
Frequently Asked Questions About United States Postal Service
Can I get a passport application at this Post Office?
Yes, Thousands of Post Offices™ accept first-time passport applications for the U.S. Department of State. Most of those locations can also take your passport photo. Please complete and print your passport application form before you apply.
Is an appointment needed for passport services?
Most Post Offices that offer passport services have set hours, and you'll need to schedule an appointment using our online scheduler. We also offer limited Passport walk-in hours at select locations.
Does this location take the photo needed for passports?
For first-time passport and photo services, please make an appointment using our online scheduler.
What is the cost to take a passport photo?
The current fee for a passport photo at USPS is $15.
When does this location do walk-in passports?
We offer limited Passport walk-in hours at select locations.
Can I get a PO Box online?
Yes, you can search for available PO Boxes and reserve one online at https://www.usps.com/manage/po-boxes.htm. The process is quick and secure, and you'll receive instructions for completing your setup in person.
How much is a small PO Box?
PO Box prices vary by location. You can check exact pricing for your area by visiting https://www.usps.com/manage/po-boxes.htm and entering your ZIP Code.
Can you get to the PO Boxes in the lobby after hours?
Most USPS locations offer 24/7 access to PO Boxes in the lobby. Access hours may vary by location, so check with your local Post Office for specific lobby hours.
How can I get a PO Box?
You can apply for a PO Box online or in person at your local Post Office. Just bring two valid forms of ID and your completed application if applying in person. To start online, visit https://www.usps.com/manage/po-boxes.htm.
What time can I check my PO Box weekly and on weekends?
You can check your PO Box during lobby hours, which often include extended hours or 24/7 access. Weekend access may vary. Check with your local Post Office for exact times.
What services can I find at the United States Postal Service located at 401 William St, River Forest?
You can send mail and packages, purchase money orders, rent Post Office™ boxes, apply for passports, buy gift cards, and access other postal services.
Can I apply for a first-time U.S. passport at this Post Office location?
Yes, this Post Office accepts first-time passport applications for the U.S. Department of State and can also take your passport photo by appointment.
Do I need an appointment to use passport services here?
Most passport services require scheduling an appointment using the online scheduler, although limited walk-in hours may be offered at select locations.
How much does it cost to have a passport photo taken at this location?
The fee for a passport photo is currently $15.
Can I rent a PO Box at this Post Office, and how do I apply?
Yes, you can rent a PO Box either online or in person. Online reservations and details are available at the USPS website; in-person applications require valid ID and a completed form.
Are PO Boxes accessible after regular business hours?
Most USPS locations offer 24/7 lobby access to PO Boxes, but hours may vary, so check with this Post Office for specific access times.
What are the business hours of the United States Postal Service at 401 William St?
The Post Office is open Monday through Friday from 9:00 AM to 5:00 PM, Saturday from 9:00 AM to 12:00 PM, and closed on Sundays.
Is there a nearby public transportation or landmark that can help me locate the Post Office at 401 William St?
While specific transit stations aren't listed, the Post Office is near notable nearby places such as the West Suburban Medical Center, River Forest Campus, and the Friends of Fisher House Illinois, which could help in locating the area.
What nearby healthcare facilities are close to the United States Postal Service at 401 William St?
Nearby healthcare facilities include West Suburban Medical Center, River Forest Campus, River Forest Vanguard Medical Group, and Rehabilitation and Sports Medicine, among others, offering various medical and wellness services.
Are there shopping options near the Post Office at 401 William St?
Yes, nearby shopping options include DSW Designer Shoe Warehouse, J.Crew Factory, LOFT, and Chico's, providing a variety of clothing and footwear stores.