'Riva' definitions:
Riva, MD -- U.S. Census Designated Place in Maryland
From: Gazetteer 2000
Name :
Riva, MD -- U.S. Census Designated Place in Maryland
Population (2000) :
3966
Housing Units (2000) :
1453
Land area (2000) :
2.495849 sq. miles (6.464219 sq. km)
Water area (2000) :
0.406736 sq. miles (1.053441 sq. km)
Total area (2000) :
2.902585 sq. miles (7.517660 sq. km)
FIPS code :
66400
Located within :
Maryland (MD), FIPS 24
Location :
38.952079 N, 76.582135 W
ZIP Codes (1990) :
21140
Note :
some ZIP codes may be omitted esp. for suburbs.