Post offices in the county of Mercer, IL

Use this page to find the post offices in your county that open earliest or stay open latest. The open hours listed are for the post office's retail hours, which means the hours in which a postal service employee is available at the counter to help with mailings and other services. Oftentimes lobbies are open extended hours, and you are able to check your PO box, drop off packages, or use the self-service APC machine to buy postage. The list below is first sorted alphabetically by city, then by post office name. Street View photos of post offices are shown when available. Please contact us if you find an error, so that we can correct it.

Street View Image of Aledo Post Office in Aledo, IL

Aledo Post Office is currently closed

For parking and list of services available, visit the official USPS page for post this post office location.

Post office address
117 N College Ave Aledo , IL 61231-9998

Get directions

Open hours
Day Open Close
Monday 8:30 AM 1:00 PM
2:00 PM 4:30 PM
Tuesday 8:30 AM 1:00 PM
2:00 PM 4:30 PM
Wednesday 8:30 AM 1:00 PM
2:00 PM 4:30 PM
Thursday 8:30 AM 1:00 PM
2:00 PM 4:30 PM
Friday 8:30 AM 1:00 PM
2:00 PM 4:30 PM
Saturday 9:00 AM 12:00 PM
Sunday Closed

Phone: 309-582-7113

  • Stamps.com logo
    Buy postage online
    Discounted USPS and UPS rates of up to 84%.
    Promo code
    STAMPS100
    $100 value
Street View Image of Joy Post Office in Joy, IL

Joy Post Office is currently closed

For parking and list of services available, visit the official USPS page for post this post office location.

Post office address
202 W Main St Joy , IL 61260-7704

Get directions

Open hours
Day Open Close
Monday 7:00 AM 11:00 AM
Tuesday 7:00 AM 11:00 AM
Wednesday 7:00 AM 11:00 AM
Thursday 7:00 AM 11:00 AM
Friday 7:00 AM 11:00 AM
Saturday 7:00 AM 9:30 AM
Sunday Closed

Phone: 309-584-4851

  • Stamps.com logo
    Buy postage online
    Discounted USPS and UPS rates of up to 84%.
    Promo code
    STAMPS100
    $100 value
Street View Image of Keithsburg Post Office in Keithsburg, IL

Keithsburg Post Office is currently closed

For parking and list of services available, visit the official USPS page for post this post office location.

Post office address
103 S 4th St Keithsburg , IL 61442-9998

Get directions

Open hours
Day Open Close
Monday 7:00 AM 11:00 AM
Tuesday 7:00 AM 11:00 AM
Wednesday 7:00 AM 11:00 AM
Thursday 7:00 AM 11:00 AM
Friday 7:00 AM 11:00 AM
Saturday 8:00 AM 9:30 AM
Sunday Closed

Phone: 309-374-2261

  • Stamps.com logo
    Buy postage online
    Discounted USPS and UPS rates of up to 84%.
    Promo code
    STAMPS100
    $100 value
Street View Image of Matherville Post Office in Matherville, IL

Matherville Post Office is currently closed

For parking and list of services available, visit the official USPS page for post this post office location.

Post office address
509 2nd St Matherville , IL 61263-9000

Get directions

Open hours
Day Open Close
Monday 10:30 AM 2:30 PM
Tuesday 10:30 AM 2:30 PM
Wednesday 10:30 AM 2:30 PM
Thursday 10:30 AM 2:30 PM
Friday 10:30 AM 2:30 PM
Saturday 10:30 AM 12:15 PM
Sunday Closed

Phone: 309-754-8938

  • Stamps.com logo
    Buy postage online
    Discounted USPS and UPS rates of up to 84%.
    Promo code
    STAMPS100
    $100 value
Street View Image of New Windsor Post Office in New Windsor, IL

New Windsor Post Office is currently closed

For parking and list of services available, visit the official USPS page for post this post office location.

Post office address
315 Main St New Windsor , IL 61465-9800

Get directions

Open hours
Day Open Close
Monday 7:30 AM 11:30 AM
12:30 PM 2:30 PM
Tuesday 7:30 AM 11:30 AM
12:30 PM 2:30 PM
Wednesday 7:30 AM 11:30 AM
12:30 PM 2:30 PM
Thursday 7:30 AM 11:30 AM
12:30 PM 2:30 PM
Friday 7:30 AM 11:30 AM
12:30 PM 2:30 PM
Saturday 8:30 AM 10:30 AM
Sunday Closed

Phone: 309-667-2219

  • Stamps.com logo
    Buy postage online
    Discounted USPS and UPS rates of up to 84%.
    Promo code
    STAMPS100
    $100 value
Street View Image of North Henderson Post Office in North Henderson, IL

North Henderson Post Office is currently closed

For parking and list of services available, visit the official USPS page for post this post office location.

Post office address
401 Main St North Henderson , IL 61466-9800

Get directions

Open hours
Day Open Close
Monday 12:00 PM 4:00 PM
Tuesday 12:00 PM 4:00 PM
Wednesday 12:00 PM 4:00 PM
Thursday 12:00 PM 4:00 PM
Friday 12:00 PM 4:00 PM
Saturday 11:30 AM 12:30 PM
Sunday Closed
  • Stamps.com logo
    Buy postage online
    Discounted USPS and UPS rates of up to 84%.
    Promo code
    STAMPS100
    $100 value
Street View Image of Preemption Post Office in Preemption, IL

Preemption Post Office is currently closed

For parking and list of services available, visit the official USPS page for post this post office location.

Post office address
1699 Us Highway 67 Preemption , IL 61276-9000

Get directions

Open hours
Day Open Close
Monday 8:00 AM 12:00 PM
Tuesday 8:00 AM 12:00 PM
Wednesday 8:00 AM 12:00 PM
Thursday 8:00 AM 12:00 PM
Friday 8:00 AM 12:00 PM
Saturday 8:00 AM 10:00 AM
Sunday Closed

Phone: 309-534-8349

  • Stamps.com logo
    Buy postage online
    Discounted USPS and UPS rates of up to 84%.
    Promo code
    STAMPS100
    $100 value
Street View Image of Seaton Post Office in Seaton, IL

Seaton Post Office is currently closed

For parking and list of services available, visit the official USPS page for post this post office location.

Post office address
312 3rd St Seaton , IL 61476-9996

Get directions

Open hours
Day Open Close
Monday 11:25 AM 3:45 PM
Tuesday 11:25 AM 3:45 PM
Wednesday 11:25 AM 3:45 PM
Thursday 11:25 AM 3:45 PM
Friday 11:25 AM 3:45 PM
Saturday 10:30 AM 1:00 PM
Sunday Closed

Phone: 309-586-4611

  • Stamps.com logo
    Buy postage online
    Discounted USPS and UPS rates of up to 84%.
    Promo code
    STAMPS100
    $100 value
Street View Image of Sherrard Post Office in Sherrard, IL

Sherrard Post Office is currently closed

For parking and list of services available, visit the official USPS page for post this post office location.

Post office address
402 3rd St Sherrard , IL 61281-7705

Get directions

Open hours
Day Open Close
Monday 7:00 AM 11:30 AM
1:30 PM 3:00 PM
Tuesday 7:00 AM 11:30 AM
1:30 PM 3:00 PM
Wednesday 7:00 AM 11:30 AM
1:30 PM 3:00 PM
Thursday 7:00 AM 11:30 AM
1:30 PM 3:00 PM
Friday 7:00 AM 11:30 AM
1:30 PM 3:00 PM
Saturday 7:00 AM 9:00 AM
Sunday Closed

Phone: 309-593-2515

  • Stamps.com logo
    Buy postage online
    Discounted USPS and UPS rates of up to 84%.
    Promo code
    STAMPS100
    $100 value
Street View Image of Viola Post Office in Viola, IL

Viola Post Office is currently closed

For parking and list of services available, visit the official USPS page for post this post office location.

Post office address
1508 13th St Viola , IL 61486-9800

Get directions

Open hours
Day Open Close
Monday 7:15 AM 11:15 AM
12:15 PM 2:15 PM
Tuesday 7:15 AM 11:15 AM
12:15 PM 2:15 PM
Wednesday 7:15 AM 11:15 AM
12:15 PM 2:15 PM
Thursday 7:15 AM 11:15 AM
12:15 PM 2:15 PM
Friday 7:15 AM 11:15 AM
12:15 PM 2:15 PM
Saturday 9:00 AM 11:00 AM
Sunday Closed

Phone: 309-596-2707

  • Stamps.com logo
    Buy postage online
    Discounted USPS and UPS rates of up to 84%.
    Promo code
    STAMPS100
    $100 value