http://www.usajobs.gov/infocenter/topLocations.asp
“Top Locations Hiring”
SNIPPET: “One of the keys to landing your perfect job is staying up to date on the latest federal hiring trends and we’re here to help. Updated weekly, this page completes the top 50 USAJOBS locations with the most job openings in the last calendar month.
Simply click on the location name to see a full list of current open job announcements.
Tip: Sort data by clicking on the header links below.”
http://jobsearch.usajobs.gov/jobsearch.asp?q=immigration%20customs%20enforcement
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ICE.GOV: “Careers”
http://www.ice.gov/careers/index.htm