About Mercer County Fair

The Mercer County Fair in Princeton celebrates Missouri's smallest-county-by-population agricultural county on the Iowa border, where the Grand River headwaters support cattle and grain farming in a county so small it barely registers on state population charts but maintains its proud agricultural fair tradition.

What to Expect

Expect livestock shows, 4-H competitions, local food vendors, and the genuine small-county community spirit of one of Missouri's most sparsely populated counties, where every participant knows every other.

Visitor Tips

Princeton is one of Missouri's smallest county seats. The county's Grand River headwaters territory is excellent for cattle grazing, and the Iowa border gives the county connections to the broader north Missouri-southern Iowa agricultural community.

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