World's Largest Mailbox

Casey, Illinois, United States

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Listed, not yet checked · Oct 2026

This Big Thing is recorded as still being here.

A working oversized mailbox on West Main Street in Casey, Illinois, listed by Guinness World Records at 162.63 cubic metres (5,743.41 cubic feet). Visitors can climb a stairway inside and post letters. Jim Bolin created it.

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PLAN YOUR VISIT

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World's Largest Mailbox

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Site-level location · 39.2991° N, 87.9930° W

FIELD GUIDE

The story

This oversized mailbox works: visitors can climb inside it and post a letter.

Guinness World Records lists the largest mailbox at 162.63 cubic metres (5,743.41 cubic feet), created by Jim Bolin and verified in Casey, Illinois, on 20 October 2015. Guinness says a hidden stairway in the post stand leads up inside the box. The Big Things Small Town website says the structure had to be fully functional to claim the title, and that a red flag goes up whenever letters or postcards are mailed. Arts Midwest, writing in July 2025, said the flag rises at outgoing mail time.

Casey is a town of about 2,400 people, according to Arts Midwest, on Interstate 70 midway between St. Louis and Indianapolis. Bolin's pipeline company supplies the repurposed material, and he and his crew have built nearly 30 large works around town, according to Arts Midwest, which says most of them are a four-minute detour off the interstate. The mailbox is one of twelve items the project's website lists as "World's Largest", alongside a rocking chair, a pitchfork, a wind chime and a barbershop pole.

The city's economic development director, Tom Daughhetee, told Arts Midwest: "Before the big things, our downtown was completely empty." Bolin estimated that between 1,000 and 2,000 people stop in Casey each week.

The project's website gives the mailbox's address as 19 W Main Street, says most of the attractions stand near Main Street and Central Avenue, and says visitors can park in public lots and walk. It also says the attractions are free and that most can be viewed at any hour.

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PRACTICAL

Plan your stop

WHAT TO EXPECT

Climb the stairs inside the mailbox and post a letter; a red flag goes up when mail is sent, as Arts Midwest described in July 2025. The project's website says its attractions are free to visit and most can be viewed at any hour.

ACCESS

On Main Street in downtown Casey, Illinois; the project website gives 19 W Main Street. It says most attractions are near Main Street and Central Avenue (Illinois Route 49), with public parking lots nearby.

COMMUNITY

Visitor Log

WHAT'S NEXT

Find another Big Thing nearby

The Big Birdcage is a walk-in cage with a swing at 26 West Main Street in downtown Casey, Illinois, one of the town's Big Things in a Small Town attractions. Fodor's reported it as 13 feet tall outside.

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TRANSPARENCY

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