Fill out application form completely. If questions are not applicable, enter "NA.These instructions must be followed exactly. Everything starts at our website. There you will find links to job opportunities, an online employment application guide, and online help for getting started. Filling out the Texas Employment Application requires careful attention to detail. Career Opportunities with Harris County. . Print the application fill out, sign and do one of the following: Submit in person. Employment Application at 1018 Dallas Street South Houston, TX 77587. Follow 5 simple steps to register for the Hire Houston Youth Job Portal, and apply for employment opportunities.