Lassen or Sierra? Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(micro)
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The cache is not at the posted coordinates!
But it is the approximate location of of the Lassen/Sierra county line.
To find the cache, you'll need to answer a few questions about these two counties.
N39 AB.CDE W120 FG.HIJ
Lassen county, named after explorer Peter Lassen, was formed in 186A
Janesville, which lost by one vote from becoming the county seat, first opened a post office in 186B
This town, which was formerly known as Chalk Ford, has a zip code of 9600C
Oscar Doyle settled in the area in the 1870's. The first post office of the town named after him opened in 190D
Sierra Army Depot(SIAD) ceased it's Open Burning Open Detonation process in 200E
Bret Harte wrote a short story that took place in this Sierra county ghost town in 185F.
The Gibsonville post office opened in 1855 and closed in 19G0.
This Sierra County mountain, named after a naval officer, has an elevation of H,713.
This town, with the only traffic signal in the county, has a zip code of 9612I.
The county seat, Downieville, was founded in 184J.
You can validate your puzzle solution with certitude.
Congrats to Cruiserdude on the FTS!
Congrats to xxxsparkmanxxx & G of C on the FTF!
Additional Hints
(No hints available.)