Twain Harte, California, United States [CDP]; population was 2,170 in 1990; housing units was 1,792 in 1990; location is 38°2'N 120°14'W; land area is 3.66 square miles (2,341 acres); water area is 0.01 square miles (8 acres); FIPS code is 80966 [SourceCBP]