- Use this tool to find the geocode for the location;
- Include the numbers you get in the URL of the Twitter feed URL,
- Add XXkm or XXmi at the end to limit the search to users within XXkm or XXmi of your location, example: http://search.twitter.com/search.atom?geocode=51.5001524%2C-6.2674937%2C30km
Read more: http://www.searchenginepeople.com/blog/twitter-search-rss.html#ixzz35jr1KCrD
Source : SearchEnginePeople.com