St. Johnsbury, Vermont, United States [CDP]; population was 6,424 in 1990; housing units was 3,040 in 1990; location is 44°26'N 72°1'W; land area is 12.99 square miles (8,310 acres); water area is 0.10 square miles (62 acres); FIPS code is 62125 [SourceCBP]