'South Valley' definitions:

South Valley, NM -- U.S. Census Designated Place in New Mexico

From: Gazetteer 2000
Name :
South Valley, NM -- U.S. Census Designated Place in New Mexico
Population (2000) :
39060
Housing Units (2000) :
13722
Land area (2000) :
29.518143 sq. miles (76.451635 sq. km)
Water area (2000) :
0.707589 sq. miles (1.832647 sq. km)
Total area (2000) :
30.225732 sq. miles (78.284282 sq. km)
FIPS code :
74520
Located within :
New Mexico (NM), FIPS 35
Location :
35.022215 N, 106.684097 W
Note :
some ZIP codes may be omitted esp. for suburbs.