Though Thornton once thrived as "an enterprising center of commerce," Thornton is now primarily a rural community. It is home to a potato warehouse and the original Thornton Merc convenience store.
Thornton's original store was called "The Country Store". It was owned by William Ezra Thornton, and run by him and his wife, Wilhemina Hansas Lyman Thornton.
At one time, Thornton "boasted of two fine general mercantile stores". Thornton's store was owned in the early 1900s by George Marler. A competing store in Thornton was owned by C. L. Galbraith. In 1971 Thornton Merc, which replaced the two prior mercantile stores, was opened at the old Marler's location by Mrs. Geraldine Evans. As of 2010 it is still in operation, and "Marler" can still be seen faintly painted on the north side. Descendants of the Marler family still own property in Thornton.
In the mid-1940s, the Church of Jesus Christ of Latter-Day Saints purchased a grain elevator in Thornton from M.G. Koon and Sons. This elevator served to store welfare grain for church stakes until 1959, and can still be seen from U.S. Highway 20 for many miles north and south of Thornton.
When Thornton had a train depot, the Yellowstone Park Special passenger train would stop in Thornton on its way to Mack's Inn and Yellowstone Park. Visitors to Heise Hot Springs would arrive by railroad at Thornton and travel by horse-drawn vehicle to the nearby mineral springs.
Thornton once had a community church directed by Reverend Baird. He presided over the church until religious services were discontinued due to insufficient numbers of attendees. The LDS Church also supported a primary and Sunday school service in Thornton for a few years. This was also discontinued as the population of Thornton diminished. The LDS Church continues to thrive in the nearby area, as expansion of Rexburg, Idaho has caused commuters including employees and students of Brigham Young University Idaho to seek available housing in Thornton and surrounding Archer and Lyman.
Thornton lies approximately seven miles south of Rexburg, Idaho and is bordered on the south by the Lorenzo Bridge, which crosses over the South Fork of the Snake River. Visible in the near west horizon are the Menan Buttes. Thornton lies on the Oregon Short Line Railroad and was built around what is now a remnant of U.S. Highway 191. This short segment of the original highway terminates within Thornton, at an old cement bridge. Since its original establishment, Thornton has been bisected by the construction of US Highway 20. The larger portion lies south of the highway- the northern portion has been nearly completely eliminated by the construction of the highway. The Archer-Lyman highway begins to the north and east of Thornton and meanders south and then east towards Ririe, Idaho.
The legal description of Thornton is "NE 4 NE 4 of Sec. 222, and of SW 4 SW 4 of Sec. 14 and of SE 4 SE 4 of sec 15 all in TS 5 N R 39 E.B.M."
Within Thornton next to the remaining Thornton Merc is an old trailer park which now accommodates both campers and longer-term residents, many of whom are migrant workers who labor in the nearby potato warehouses. Another RV Park lies south across the old concrete bridge nearer to the Snake River South Fork. A bed and breakfast appears on the map here as the Sheffield House  The Thornton Shell gas station and convenience store lies between Highway 20 and the railroad and used to be known as the Mini Mart. Behind the Shell station is the old grain elevator which now advertises the gas station. Also marooned between the two highways is an older home which was once owned by the Keith Wilcox family in the mid 1900s, which has been stranded now due to the removal of a portion of South 3300 West. A nearby potato warehouse owned by Keith and his sons is no longer in operation, and is vacant except for individuals who have taken residency in the office space. Part of a community church still stands in Thornton, though it is no longer in use. There is a quiet RV park across from the potato warehouse called Thompson RV Park. It is a small 25 space park that prefers seniors, owned by Wayne & Linda Thompson. Mr. Thompson has lived in the house on this property all his life. It has full hook-ups up to 50 amps and a laundry/shower/restroom building.
- Madison County Homepage
- Brigham Young University Idaho
- Rexburg, Idaho Homepage
- Rexburg Chamber of Commerce
- Historical Society, Upper Snake River Valley (Winter 1971). "Thornton". Upper Snake River Valley Historical Society Quarterly. 1 (3): 59.
- Waters, Philip (2010-08-09). "Personal History of Waters, P". Interview.
- "A brief history of Mack's Inn". Henry's Fork Country. 2009-07-19. Retrieved 2010-08-25.
- Sanderson, Dale (2009-07-19). "End of US highway 191". US Ends.com. Archived from the original on 2009-12-16. Retrieved 2010-08-24.
In 1972, US 191 was shortened, such that it ended once again at its original terminus: Idaho Falls (or at least near it)
- Waters, Philip (2010-08-09). "Interview with Gordon, D". Interview.
- (Madison County) ("NE 4 NE 4 of Sec. 222, and of SW 4 SW 4 of Sec. 14 and of SE 4 SE 4 of sec 15 all in TS 5 N R 39 E.B.M").
- "Google Map of Thornton, Idaho".
- "Thompson RV Park, Rexburg Idaho".