Junction City is a census-designated place (CDP) in Trinity County, California.

On July 20, 2008 fire threatened communities near Junction City; some areas were under mandatory evacuation.

Many huge forest fires broke out because of a lightning storm which occurred on June 20, 2008 in Northern California.

According to the United States Census Bureau, the CDP covers an area of 27.9 square miles (72.4 km2), 99.84% of it land and 0.16% of it water.

The 2010 United States Census[20] reported that Junction City had a population of 680.

86 households (29.4%) were made up of individuals, and 26 (8.9%) had someone living alone who was 65 years of age or older.

There were 361 housing units at an average density of 12.9 per square mile (5.0/km2), of which 236 (80.5%) were owner-occupied, and 57 (19.5%) were occupied by renters.

[22] Federally, Junction City is in California's 2nd congressional district, represented by Democrat Jared Huffman.