USPS Post Office Security Sq - Windsor Mill
6901 Security Blvd, 21244 Windsor Mill
Today
Today's opening hours
This week's opening hours
Retail
- Monday 11:00 am to 2:00 pm
- Tuesday 11:00 am to 2:00 pm
- Wednesday 11:00 am to 2:00 pm
- Thursday 11:00 am to 2:00 pm
- Friday 11:00 am to 2:00 pm
- Saturday 11:00 am to 2:00 pm
- Sunday Closed
Other opening hours
Call Referral
- Monday to Saturday
- 11:00 am to 2:00 pm
- Sunday
- Closed
Lobby
- Monday to Saturday
- 11:00 am to 2:00 pm
- Sunday
- Closed
Passport Walk-In
- Monday to Saturday
- 11:00 am to 2:00 pm
- Sunday
- Closed
PO Box Access
- Monday to Saturday
- 11:00 am to 2:00 pm
- Sunday
- Closed
Opening hours updated on 11/07/2026
Report a changeThis Post Office at a glance
Opening hours of USPS Post Office Security Sq - Windsor Mill: Monday to Saturday from 11:00 am to 2:00 pm; closed Sunday.
- Opening hours a week
- 18h
- Opening hours a week
- Days open, Monday to Saturday
- 6/7
- Days open, Monday to Saturday
- Earliest opening, Monday to Saturday
- 11:00 am
- Earliest opening, Monday to Saturday
- Latest closing, Monday to Saturday
- 2:00 pm
- Latest closing, Monday to Saturday
- Open all day
- No break
- Open all day
Special days ahead
Public holidays, closures and special opening hours over the next two months.
- Wednesday, November 11 Veterans Day Opening hours not confirmed
- Thursday, November 26 Thanksgiving Day Opening hours not confirmed
- Friday, December 25 Christmas Opening hours not confirmed
- Friday, January 1 New Year’s Day Opening hours not confirmed
Services
Services Available: 9
Parking 1
Contacts 4
Last Collection 6
Sending from this Post Office
- First-Class Mail from From $0.65 up to Postcards
- Shipping Services from From $7.90 up to USPS Ground Advantage (2–5 days)
Indicative rates subject to change by the postal operator.
- Open
- Closing soon
- Closed
- Opening hours not confirmed
- This address
Practical information
Good to know
USPS Post Office Security Sq - Windsor Mill is in Windsor Mill, at 6901 Security Blvd. It opens 6 days a week, Saturday included.
When it is closed, the nearest other offices are USPS Post Office Cpu Contract Branch 116 (0.9 mi) and USPS Post Office Windsor Mill (1.2 mi).
The next public holiday is Veterans Day, Wednesday, November 11. Opening hours often change that day: check them before you go.
Frequently asked questions
Is USPS Post Office Security Sq - Windsor Mill open on Saturday?
Yes It is open on Saturday from 11:00 am to 2:00 pm.
Is USPS Post Office Security Sq - Windsor Mill open on Sunday?
No It is closed on Sunday.
What time does USPS Post Office Security Sq - Windsor Mill close?
It closes Monday to Saturday at 2:00 pm.
Is there a cash machine?
This Post Office does not list a cash machine.