Angels Camp, also known as City of Angels and formerly Angel's Camp, Angels, Angels City, Carson's Creek and Clearlake, is the only incorporated city in Calaveras County, California, United States. The population was 3,835 at the 2010 census, up from 3,004 at the 2000 census. It lies at an elevation of 1378 feet (420 m). 

Mark Twain based his short story "The Celebrated Jumping Frog of Calaveras County" on a story he claimed he heard at the Angels Hotel in 1865. The event is commemorated with a Jumping Frog Jubilee each May at the Calaveras County Fairgrounds, just east of the city. Because of this, Angels Camp is sometimes referred to as "Frogtown." 

The city is California Historical Landmark #287.  http://en.wikipedia.org/wiki/Angels_Camp,_California 

On January 22, 1865, Mark Twain went north from Jackass Hill, in nearby Tuolumne County, to Angel's Camp with Jim Gillis, who had a claim there. During their first week, heavy rains confined them to Tryon's Hotel; they spent the next three weeks prospecting with little success. Throughout this time -- especially during the rainy week -- Mark Twain exchanged yarns with locals, notably Ben Coon, and left with a notebook filled with story ideas. Chapter 61 of Roughing It briefly describes this period.

 (Rassmussen pg. 14) \