Wisconsin is made up of 72 counties, this cache is focused on Pepin county. Pepin County is a county in the U.S. state of Wisconsin. As of the 2010 census, the population was 7,469, making it the fourth-least populous county in Wisconsin. Its county seat is Durand. Pepin County was the birthplace of Laura Ingalls Wilder. Here are a few stats about Pepin County, courtesy of Wikipedia. You can learn more about Pepin county at: https://en.wikipedia.org/wiki/Pepin_County,_Wisconsin
This county's oldest geocache is GCD239 Overlooked Scenery, placed by El Bastardo.
You will find this cache at N44 36.ABC W90 02.DEF
A: Congressional District
B & F: The oldest cache was Hidden : 02/0B/20F3.
C & E: Pepin county was founded February E5, 18C8.
D: The number of letters in the middle name of the girl mentioned being born in this county.
SOURCE: Most of the information on this page was obtained from Wikipedia's page about this Wisconsin county.
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CHECK SUM: A+B+C=17 D+E+F=9