The Advisory Committee for Immunization Practices (ACIP) recommends that adolescents routinely receive the following vaccines: meningococcal conjugate (MenACWY, 1 dose); tetanus, diphtheria, acellular pertussis (Tdap, 1 dose); and (for females) human papillomavirus (HPV, 3 doses). Adolescents also should receive the following recommended vaccinations they missed during childhood: measles, mumps, rubella (MMR, 2 doses); hepatitis B (HepB, 3 doses); and varicella (VAR, 2 doses). Since 2006, CDC has conducted the National Immunization Survey--Teen (NIS-Teen) to estimate vaccination coverage among adolescents aged 13-17 years. This report summarizes results from 2009 NIS-Teen and updates data from 2008 NIS-Teen. Comparing 2009 with 2008, vaccination coverage among adolescents for the three routinely administered adolescent vaccines increased for Tdap (from 40.8% to 55.6%), MenACWY (from 41.8% to 53.6%), >or=1 dose of HPV (from 37.2% to 44.3%), and >or=3 doses of HPV (from 17.9% to 26.7%). Vaccination coverage varied widely among states; four states (Connecticut, Massachusetts, New Hampshire, and Rhode Island) had coverage of >60% for all three of the routinely administered adolescent vaccines (Tdap, MenACWY, and HPV). Nationally, Healthy People 2010 vaccination objectives of 90% coverage among adolescents aged 13-15 years were met for >or=3 doses of HepB and >or=1 dose of VAR. Coverage with routine adolescent vaccines is increasing; however, more effort, including identification and dissemination of successful state-based practices, is needed to continue to increase the number of adolescents vaccinated according to ACIP recommendations.