Marble Falls, TX -- U.S. city in Texas Population (2000): 4959 Housing Units (2000): 2085 Land area (2000): 6.144444 sq. miles (15.914036 sq. km) Water area (2000): 0.554631 sq. miles (1.436487 sq. km) Total area (2000): 6.699075 sq. miles (17.350523 sq. km) FIPS code: 46584 Located within: Texas (TX), FIPS 48 Location: 30.574135 N, 98.278180 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Marble Falls, TX Marble Falls