visit ftp://ftp.1000genomes.ebi.ac.uk/vol1/ftp/release/20130502/ for the actual data.
There are also sample_population relationship description on the same ftp site. I don't have access to my record of the specific dir right now, but just browsing the site to see the docs will find it without much effort.
Hope this would help.
You can use tabix if you prefer not to download the large vcf files of the actual data.
To download a single snp, lets say chr6 nucleotide position 7580958 (1 based numbering of GRCh 37 from the 1000 Genomes phase 3 data). Format is:
tabix name-of-vcf-file chr:start-end
tabix ftp://ftp.1000genomes.ebi.ac.uk/vol1/ftp/release/20130502/ALL.wgs.phase3_shapeit2_mvncall_integrated_v5.20130502.sites.vcf.gz 6:7580958-7580959 6 7580958 rs2076299 A G 100 PASS AC=1018;AF=0.203275;AN=5008;NS=2504;DP=21936;EAS_AF=0.2867;AMR_AF=0.1772;AFR_AF=0.3139;EUR_AF=0.0358;SAS_AF=0.1585;AA=A|||
So the African allele frequency of rs2076299 in the 1000 Genomes data is