Distances between County that are within 50 miles
Unique identifier is  county
Census 2010 SF1 Summary Level 050
by Jean Roth , jroth@nber.org , 11 Aug 2014
510-840 Independent city code
001-507 County or equivalent area code
County7, 8 COUNTY 3 30 A/N
Census 2000 SF1 .do and .dct files are by Jean Roth , jroth@nber.org , 2012-11-08
Census 2000 SF1 notes are by Jean Roth , jroth@nber.org , 2012-11-08