1A is the most common in the US but here's a more detailed explanation of how genotypes differ around the world
http://onlinelibrary.wiley.com/store/10.1002/hep.27259/asset/hep27259.pdf;jsessionid=D5BBAF761D446D5C81A5A730CCC3A757.f01t03?v=1&t=iejhx0dn&s=12e0108a658be0c3fcef64a8c86f3d04d540665d
Hepatitis C is divided into six distinct genotypes throughout the world with multiple subtypes in each genotype class. A genotype is a classification of a virus based on the genetic material in the RNA (Ribonucleic acid) strands of the virus.
Hepatitis C Genotypes - Hepatitis Central
www.hepatitiscentral.com/hepatitis-c/hepatitis-c-genotypes/