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In page Simeon Mills:

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Mills was born in 1810.[1] Named assistant postmaster, he walked from Chicago to Madison, Wisconsin Territory, arriving in June 1837.[2] Mills met John Catlin and became the first Deputy Postmaster of Madison in 1837, housing the post office itself in his own store. He was the Clerk of the District Court of Dane County and the Clerk of the Supreme Court of the Wisconsin Territory. Mills was the last treasurer of the territory and was elected to the 1st Wisconsin Legislature in 1848. During the American Civil War, he was the Paymaster of Wisconsin. Mills died in 1895.[3]