[citation needed] Until 1954, the legal status of Frannie was that of an unincorporated area taking in parts of Big Horn and Park Counties.

The governing body has authority over the budget, other fiscal matters, and other major issues affecting the town.

The town is also located two miles south of the Montana border and is the northernmost town in Wyoming's Bighorn Basin—a mountain desert region which relies on a network of canals and pipelines to provide irrigation and potable water for the population, farming, and ranching activities.

According to the United States Census Bureau, the town has a total area of 0.44 square miles (1.14 km2), all land.

Accordingly, visitors to Frannie are greeted with a welcoming sign which includes the phrase "Biggest Little Town In Wyoming."

Included in the Park County portion of Frannie is the post office and two of the town's three businesses.

Three television stations are available in Frannie: KSVI (ABC,) KTVQ (CBS) and KULR (NBC) from Billings.

Reception of additional TV stations is available, by subscription, from TCT West Telephone of Basin, Wyo.

Public education in the town of Frannie is provided by Big Horn County School District #1.