Instructions. Verify that you meet the minimum age requirements to obtain a marriage license in Las Vegas. You will need to be at least 18 years of age, or have the written consent of your parent or guardian.You will need to be able to show a valid photo identification to prove that you are of legal age to obtain a marriage license in Las Vegas. Fill out a marriage application form.You can obtain this form online by visiting the Clark County website (see Resources). Print out the form and bring it with you to the Marriage Bureau, or you can request a paper application in person and fill it out at the Marriage Bureau.Go down to the Las Vegas Marriage Bureau office located at:ou can obtain this form online by visiting the Clark County website (see Resources). Print out the form and bring it with you to the Marriage Bureau, or you can request a paper application in person and fill it out at the Marriage Bureau. Go down to the Las Vegas Marriage Bureau office located at: