Constantia, California
Encyclopedia
Constantia is a former settlement in Lassen County
Lassen County, California
Lassen County is a county located in the northeastern portion of the U.S. state of California. As of the 2010 census, the population was 34,895, up from 33,828 at the 2000 census...

, California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

. It was located near the south end of Long Valley 45 miles (72 km) southeast of Susanville
Susanville, California
Susanville is the county seat of Lassen County, California, United States. Susanville is located on the Susan River in the south-central part of the county, at an elevation of 4186 feet . The population was 17,974 at the 2010 census, up from 13,541 at the 2000 census...

.

The Constantia post office opened in 1912 (having been moved from Long Valley
Long Valley, Lassen County, California
Long Valley is a former settlement in Lassen County, California. It was located in Long Valley northwest of Constantia.A post office operated at Long Valley from 1869 to 1912, when it was moved to Constantia, moving also in 1898.-References:...

and closed in 1927.
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