You can get a job at Aon by applying on the careers section of the company's website at Aon.com. Scroll to the bottom of the website home page and click on the Careers link. On the Careers page, Aon lets you search and apply to jobs by nation, as of 2015.
On the career section for the United States website section, either browse through the list of job openings and click on the entries that interest you, or search for specific jobs by choosing a career category, keyword or request number, country, state and city. You can also click on the Hot Jobs link for a list of featured jobs. Even if you are on the United States page, the web page still shows openings in other countries as well.
Each job opening entry gives a job title, location, a description of the duties involved and a list of educational and other requirements. You can apply to the individual jobs by clicking on the blue Apply button accompanying each entry. If you are not ready to apply immediately, you can still sign up to the website to receive job opening updates. The Apply button takes you to Aon's online application portal, where you can fill out and submit an application.