The following websites offer online resources for finding job fairs.
Career Fairs - www.careerfairs.com
Good free site completely devoted to job fairs. Doesn't include all job fairs everywhere but is a good source for general searches in US and Canada. Search by month, category and state.
Corporate Gray Online - www.corporategray.com
Lists military career fairs all over the U.S., many of which are open to civilians
Diversity Job Fairs - www.diversityjobfairs.com
Employment Guide - http://www.employmentguide.com/browse_jobfairs.html
Has a free job board for domestic jobs. Contains lists of educational opportunities and US job fairs.
Intelligence Careers - .www.intelligencecareers.com/careerfairs
Free access to site. Most "events" listed on this site are "Defense Systems & Intelligence Careers" job fairs. The event announcements include lists of confirmed participants (the companies). Lists some intelligence "industry" jobs and offers a connection to ThinkingJobs.com which has another job board. Very DC-centric, but does include some fairs in other areas of the US.
IT Career Events - www.it-careernet.com
Jobexpo.com - www.jobexpo.com
National Career Fairs - www.nationalcareerfairs.com
Nonprofit Career Fairs - www.idealist.org/fairs
Security Clearance Expo - www.SecurityClearanceExpo.com
Targeted Job Fairs - www.targetedjobfairs.com
Tech Expo USA - www.techexpousa.com
• Lists job fairs for people with security clearances
Transition Assistance Online - www.taonline.com
Primarily for military transition employment services for veterans and family members, but also offers news about job fairs throughout the US as well as articles and advice about the job search. Veterans and family members can post their resumes on the site. Offers a job board and a free email newsletter.
The Washington Post - www.washingtonpost.com/jobs.html