Do I need to list all my jobs on an application?
No matter the format, you can list almost as many jobs as you want, provided they are related to the job opening. However, note that after you become an employee, your resume and cover letter may become a part of your permanent file as well, along with the application form — so always put forth truthful information.
Can you omit jobs on your application?
A short-term job that helped you pay some bills while you sought full-time work can likely be left off your resume. You should never omit relevant jobs (or any information) from a resume that will cause an employer to be misled in any way. Perhaps they were fired from a previous job, or left a job on bad terms.
How far back should you go on a job application?
Career coaches and professional resume writers advise you focus on the past 10 to 15 years, for most industries. (Some roles, like those within the federal government or in academia, typically, require more complete career histories.)