Marble Falls, Texas, United States [City]; population was 4,007 in 1990; housing units was 1,840 in 1990; location is 30°35'N 98°16'W; land area is 5.37 square miles (3,439 acres); water area is 0.55 square miles (355 acres); FIPS code is 46584 [SourceCBP]