The following is not a complete list but has covered us on this trip many times.  

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From north to south;

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Shelby, MT -
Maria's Fair,
619 W Marias Fair Rd, Shelby, MT

406-434-2692

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Great Falls, MT -
The King's Arena,
50 Foothills Ln, Great Falls, MT
406-750-7855

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Helena, MT - 
Lewis & Clark Fairgrounds
989 W Custer Ave, Helena, MT
406-457-8516

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Dillon, MT -
Beaverhead County Fairgrounds,
707 S. Argenta St, Dillon, MT
406-660-2792

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Pocatello, ID - 

Bannock County Fairgrounds
10588 Fairground Dr., Pocatello, ID
208-237-1340

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Tremonton, UT - 

Box Elder Fairgrounds
320 N 1000 W, Tremonton, UT
435-695-2551

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Spanish Fork, UT - 

Spanish Fork Fairgrounds
475 S Main St, Spanish Fork, UT
801-804-4616

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Richfield, UT - 

Sevier County Fairgrounds
410 E 200 S, Richfield, UT
435-896-5385

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Panguitch, UT - 

Garfield County Fairgrounds
25 South 200 East, Panguitch, UT
435-616-2282

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Flagstaff, AZ - 

Fort Tuthill County Park

2446 FOrt Tuthill Loop, Flagstaff, AZ

928-679-8000

If you find yourself too far away from any of the places in my list, check the links below to find the name of the county closest to you.  Once you know the county, search for the County Fair or State Fair using google and that handy phone.

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I've included a link to some maps that may be helpful and also added maps with key county fairs in each state you traverse.