How to download SNP data from specific regions, population and positions?
The HapMap website was suspended due to a security issue. Archived HapMap data is available via FTP, but it's a better idea to download up-to-date International Genome data from the IGSR website (which includes the HapMap individuals as a subset).

The format you use will be dependent on the data analysis program you're using. In most cases involving SNP analysis, the VCF format is probably what would be used.